Lasioglossum olympiae (Cockerell 1898)

Lasioglossum olympiae (Cockerell)

Halictus olympiae Cockerell, 1898b:51 [female].—Vachal, 1904:476 [male].

Lasioglossum olympiae.—Michener, 1951:1107 [Nearctic catalog].—Moldenke and Neff, 1974:53 [locality and flower records, sex ratio].—Hurd, 1979:1957 [Nearctic catalog].

TYPE MATERIAL.—The female holotype, in the National Museum of Natural History, Smithsonian Institution, is in good condition. It is labeled

Olympia, [Thurston County], Wash.[ington]/6[June] 26 [18] 96/Type No. 29420 U.S.N.M. [red label]/H.[alictus] olympiae n. sp. [handwritten by Cockerell].

There were no paratypes designated.

Halictus olympiae var. subangustus, long thought to be a junior synonym of Lasioglossum olympiae, is herein reported to be a junior synonym of L. sisymbrii.

DISTRIBUTION (Figure 531).—Lasioglossum olympiae is presently known from north and central California, Idaho, Oregon, Washington, and Vancouver Island. It does not occur in Colorado as was tentatively reported in both nearctic catalogs.

DIAGNOSIS.—The strong, regular striations of the propodeal dorsal surface (Figure 536) will distinguish Lasioglossum olympiae from all other New World Lasioglossum except L. leucozonium, L. zonulum, L. pacificum, L. timberlakei, and L. sisymbrii. Lasioglossum leucozonium and L. zonulum have relatively longer heads than that of L. olympiae (Figures 492, 532, 734), coarser mesoscutal punctation (Figures 497, 537, 739), and a conspicuously short propodeal dorsal surface that is only slightly longer than the metanotum (Figures 496, 738; noticeably longer than metanotum in L. olympiae as in most other species). Lasioglossum sisymbrii is easily differentiated from L. olympiae by the former species' basal hair band on tergum I (Figure 132) and its pale, translucent tegulae. The most similar species to L. olympiae are L. pacificum and L. timberlakei (especially the dark form). They differ from L. olympiae in having the posterior edge of the propodeal dorsal surface slightly bowed posteriad as seen in dorsal view (Figure 559; sharply truncated in L. olympiae, Figure 536). Furthermore, L. pacificum and L. timberlakei (dark form) have the dorsal propodeal striations more widely spaced than those of L. olympiae (Figures 536, 559, 623), the area immediately dorsoanteriad of the middle coxa striolated and dull (Figure 147; relatively smooth and polished in L. olympiae, Figure 146), and the head and body pubescence generally pale yellowish brown to golden (white in L. olympiae).

Males of L. olympiae can be recognized by the unique vestiture of sternum V, characterized by a median, longitudinal patch of short, dense hairs (Figure 203). Also helpful in identifying these males (but not unique) is the strongly striate dorsal propodeal surface and the lack of a clypeal maculation.

DESCRIPTION.—FEMALE: (1) Length 7.6–9.6 mm (x = 8.9, n = 15); (2) wing length 2.3–2.8 mm (x = 2.6, n = 15); (3) abdominal width 2.7–3.1 mm (x = 3.0, n = 15).

Structure: (4) Head short (Figure 532; length/width ratio 0.77–0.88, x = 0.83, n = 15). (7) Supraclypeal area evenly rounded, (8) weakly protuberant. (9) Clypeus projecting approximately 0.78 of its length below lower margin of eyes; (11) surface without median longitudinal sulcation. (14) Distance between lateral ocelli subequal to distance between lateral ocellus and eye. (23) Flagellomere 1 subequal in length to 2 along dorsal surface. Labrum as in Figure 534; (27) distal keel narrow in frontal view, lateral edges slightly bowed; (28) distal lateral projections virtually absent, evident as obscure swellings; (29) fimbrial setae acutely pointed (unlike other species, sensillae on basal elevation on conspicuous, wart-like swellings).

(32) Pronotal lateral angle moderately obtuse; (33) pronotal lateral ridge incomplete, broadly interrupted by oblique lateral sulcus; (34) lower portion of lateral ridge inconspicuous, broadly rounded. (35) Mesoscutal lip rounded, not bilobed, (36) moderately elevated from pronotum. (40) Dorsal surface of propodeum about 0.69 the length of scutellum and about 1.2 times the length of metanotum, (41) not depressed centrally, (42) posterior margin sharply truncated; (43) propodeal triangle weakly defined laterally; (44) lateral carinae completely encircling posterior surface. (45) Tibial spur as in Figure 42.

(46) Lateral edge of metasomal tergum II weakly sinuate, nearly straight.

Sculpture: (47) Face shiny, (48) densely and uniformly punctate between ocelli and antennae, punctures contiguous. (51) Supraclypeal area extremely granulate; (52) uniformly and densely punctate, punctures separated by their width or less. (53) Clypeus granulate basally and medially to apex, apicolateral areas polished; (54) punctures separated by less than their width basally, becoming less dense apically. (56) Mesoscutum shiny; (57) punctation as in Figure 537, nearly uniform, punctures 1–2 times their width apart, granuloso-punctate along anterior edge. (58) Scutellum sparsely punctate adjacent to midline, punctures 2–3 times their width apart. (63) Dorsal surface of propodeum (Figure 536) strongly and completely striated, striae closer together medially than laterally, usually with obscure regulae in median sulcations; (64) surface smooth, not alveolated. (65) Metasomal tergum I shiny; (66) punctation fine, moderately sparse, punctures about 2 times their width apart.

Coloration: (71) Wing membrane nearly hyaline, very lightly pigmented.

Vestiture: (74) Pubescence of head white. (75) Pubescence of thorax white to yellowish white; (76) mesoscutal hairs moderately dense, conspicuously plumose. (77) Hind tibial hair color differentiated, mostly white to pale yellowish brown, dorsal hairs dark brown to brown. (78) Anterior hairs of metasomal tergum I and (79) basal hair bands of terga II–IV white. (80) Acarinarium absent, elongate hairs scattered over anterior surface of tergum I.

MALE: Similar to female except as follows: (1) length 6.2–7.8 mm (x = 7.0, n = 15); (2) wing length 1.8–2.3 mm (x = 2.0, n = 15); (3) abdominal width 2.0–2.5 mm (x = 2.3, n = 15). (4) Head as in Figure 533 (length/width ratio 0.76–0.95, x = 0.86, n = 15). (5) Gena subequal to eye in width, (6) rounded, not produced posteriorly. (10) Clypeal surface broadly rounded, not flattened or depressed. Labrum as in Figure 535; (24) distal process absent; (25) basal area rounded medially, not depressed; (26) basal lateral depressions absent. (30) Mandible very short, not reaching opposing clypeal angle. (53) Clypeus weakly granulate, shiny; (54) punctation nearly uniform throughout, punctures separated by 1–2 times their width. (68) Clypeal maculation absent. (69) Flagellum entirely dark. (72) Tarsi dark, concolorous with tibiae.

Vestiture: Sternal vestiture as in Figures 203; (82) posterior half of sternum IV with dense, conspicuous band of adpressed hairs; (83) sternum V with a unique median, longitudinal patch of short, dense hairs; posterior sternal edge with short lateral hair fringes.

Terminalia: Sterna VII–VIII as in Figure 543; (84) unlike other species, sternum VII relatively large, median process broad; sternum VIII without median process, disc conspicuously broad. Genitalia in Figures 538–542; (86) gonobase short; (87) gonostylus short, broadly rounded; (89) retrorse membranous lobe extremely reduced, slender; (90) volsella with lateral flange but lacking prominent lobe.

FLIGHT RECORDS (Figure 544).—Lasioglossum olympiae females have been collected from March through early September, with 78% of the records from May and June, with a peak in early June. The one female collected in September was taken in Benton County, Oregon. The one female record from October was from Santa Clara County, California.

Most male specimens have been collected in late July through August, with records ranging from June to early October. All of the 17 records from September were specimens collected in Oregon and British Columbia. The three males collected in October were from Latah County, Idaho; the two collected in June were from Alameda and Marin counties, California.

FLOWER RECORDS.—The flower records for L. olympiae are highly influenced by a large series of females (113 specimens) collected by E.G. Linsley and A.J. Walz in Mariposa County, California, June 1942. All of these females were taken from Eriogonum (none had pollen loads).

Summary: Females (204): Polygonaceae 52%; Rosaceae 13%. Males (10): Compositae 100%. Total: 214 in 15 families, 23 genera as follows:

Brassica 2; *Ceanothus 8(2); Crataegus 1; *Downingia 2(1); Eriogonum 109; *Eschscholtzia 2(1); *Heracleum 12(4); Lasthenia 3; Layia 1; *Limnanthes 8(1); Orthocarpus 2; *Phacelia 2(2); Potentilla 4; Ranunculus 9; Rosa 8; Rubus 8; Salix 4; *Sisyrinchium 1(1); Solidago 9; Spiraea 7; Taraxacum 1; Trifolium 7; Veronica 3;.

SPECIMENS EXAMINED.—857 (800, 57).

CANADA. BRITISH COLUMBIA: Bowser, Courtenay, Gabriola Island, Langford, Nanaimo Biology Station, Royal Oak, Saanich, Victoria.

UNITED STATES. CALIFORNIA: Alameda Co.: Albany, Berkeley, Piedmont; Amador Co.: Fiddletown, 5.6 mi E; Contra Costa Co.: Antioch, Orinda Village; El Dorado Co.: Lake Tahoe, Strawberry Valley, Tallac; Fresno Co.: Sulphur Meadow, Shaver Lake; Humboldt Co.: Bair's Ranch, Fort Seward, Garberville, 3 mi N; Madera Co.: Midway, Oakhurst; Marin Co.; Mariposa Co.: Fish Camp, Miami Ranger Station, Wawona; Mendocino Co.; Modoc Co.: Adin Pass, Buck Creek Ranger Station, Davis Creek, Likely, 15.4 mi E; Nevada Co.: Russell Valley, Sagehen, near Hobart Mills, Placer Co.: Dutch Flat; Plumas Co.: Butterfly Valley, Clio, Quincy (4 mi W), Portola; San Francisco Co.: salt marshes, San Francisco Bay; San Mateo Co.: King's Mountain, Menlo Park; Santa Clara Co.: Los Gatos, Palo Alto; Santa Cruz Co.: Felton; Shasta Co.: Burney, Hat Creek; Sierra Co.; Siskiyou Co.: Bartle (1 mi SE), Dorris (16 mi SW), Fallen Leaf Lake, Lake Tahoe; Sonoma Co.; Trinity Co.: Big Flat, Coffee Creek; Tuolumne Co. IDAHO: Kootenai Co.: Coeur d’Alene; Latah Co.: Deary, Potlatch, Troy; Lewis Co.: Nezperce; Nez Perce Co.: Gifford, Lewiston. NEVADA: Douglas Co.: Carlson Valley.

OREGON: Benton Co.; Clackamas Co.: Oswego; Columbia Co.: Scappoose; Douglas Co.; Jackson Co.; Klamath Co.: Bly Mountain, Klamath Lake; Lake Co.: unspecified locality; Lane Co.: Eugene; Lincoln Co.: Lincoln, 6 mi W; Linn Co.; Marion Co.: Mt. Angel, Salem, Wheatland Ferry; Sherman Co.: Mosier; Umatilla Co.: Echo, Ukiah-Dale Forest wayside, Camas Creek: Union Co.: Cove; Wallowa Co.: Minam State Park; Washington Co.: Forest Grove; Yamhill Co.: Sheridan. WASHINGTON: Asotin Co.: Anatone, 4 mi S; Island Co.: Oak Harbor, 2 mi NE (Whidby Island); San Juan Co.: Friday Harbor, San Juan Island; Pierce Co.: Fort Lewis; Spokane Co.: Spokane; Thurston Co.: Olympia, Tenino; Walla Walla Co.: Walla Walla.

Lasioglossum olympiae is a species of sweat bee in the family Halictidae.

Lasioglossum olympiae là một loài Hymenoptera trong họ Halictidae. Loài này được Cockerell mô tả khoa học năm 1898.