Pleotrichophorus lagacei Hille Ris Lambers 1969

Pleotrichophorus lagacei Hille Ris Lambers, 1969:175–178

DIAGNOSIS.—This species is peculiar among Pleotrichophorus species with its distinctly clavate cornicles and among nearctic species of this genus, by having the pi setae the longest of the rostral (IV+V) setae.

DESCRIPTION.—Hille Ris Lambers’ original description includes the following data:

Apterous Viviparous Female: BL 1.80–2.50; antennae 2.41–2.94, with a.s.III .40–.61, a.s.IV .36–.52, a.s.V .38–.44, and a.s.VI .13–.16 + .75–1.06; cornicles .41–.56, cauda .27–.36, and rostrum IV+V .10–.105 mm. Proportions of VIu/VIb 6–7½; co/ca 1.52–1.67 (1.61 ± .058, n = 6, calculated from his tabulated measurements); rostrum IV+V about 5/7 length of hind ta–2. Number of df setae 16, number of sensoria 1–2. Head and body rather short (e.g., .017–.019 mm), “mostly wider than long, virtually without shaft, with striate, slightly serrated, flattish, very widely fan-shaped knobs”. Chaetotaxy of rostrum IV+V normal for Pleotrichophorus, that is, the anterodorsal pair of setae present.

Alate Viviparous Female: Measurements of 1 type-specimen: BL 2.01; antennae 2.65 with a.s.III .51, a.s.IV .43, a.s.V .38 and a.s.VI .14 + 1.01; cornicles .44 and cauda .26 mm. Sensoria on a.s.III 11–13, and on a.s.IV 0–1.

Sexuales: Unknown.

HOST.—Haplopappus bloomeri.

DISTRIBUTION.—Known only from type-locality in Northern California (Mt. Shasta).

TYPES.—Holotype apt.v.f. and some paratypes in DHRL collection, and other paratypes in UC collection at Berkeley (Entomology Department).

SPECIMENS EXAMINED.—None.

Pleotrichophorus longinectarius (Gillette and Palmer)

Capitophorus longinectarius Gillette and Palmer, 1933:352 [type: apt.v.f., Chimney Rock, Colorado, MAP, 26–VI–1932, beaten off Artemisia longifolia; USNM 49298]; 1934: 151–152.—Knowlton, 1954:8.

Pleotrichophorus longinectarius (Gillette and Palmer).—Hille Ris Lambers, 1953:115; 1969:168.

DIAGNOSIS.—P. longinectarius is recognizable by its long cornicles, 2½ to 4 times (3.25 ± .22, n =17) the cauda in length; the dense, wrinkled and unarmed cornicular imbrications; the stout, non-constricted cauda; the dense head (mean df =70.89 ± 8.68, n = 9) and body setae; the rather widely expanded setae on the basal 2 segments of the antennae; and the long (.135–.15 mm, m =.143, n = 11) and stoutly needle-tipped last rostral segment.

DESCRIPTION.—Apterous Viviparous Female: Color in life pea green (Gillette and Palmer, 1933: 352); cleared specimen with body pale, tips of rostrum, a.s.III, IV and V, areas around primary sensoria of a.s.VI, unguis, and tips of tibiae dusky, tarsi dark brown. Body length 2.05–2.40 (2.22, n = 10), width across eyes .47–.58 (.532, n = 10) mm. Head with large, conspicuously protruding compound eyes; laterofrontal tubercles well developed, mesofrontal tubercle rather small; mf usually 2p, lf 3–5 (usually 4) on each side, vlf 2p, df 54–81 (70.89 ± 8.68, n = 9), vf 14–28 (21.2, n = 9), pc 2p, ac 4–6, and md 2–4 (usually 3) on each plate; dorsal setae funnel-shaped with anterior slightly longer, more distinctly stemmed than posterior ones; ventral setae similar but more elongate and slender; mf .0286–.0440 (.0383, n = 17), df–1 .0352–.0462 (.0411, n = 16) mm long. Antennal segment I produced mesodistally, densely imbricate-spiculate, with 7–18 knobbed to funnel-shaped setae aside from usual pointed one on dorsum. A.s.II with usually setae of same shape as most on a.s.I. A.s.III densely imbricate, with small rod-like to knobbed setae, longest less than ½ basal diameter of segment; with 1–2 (1.18, n = 22) sensoria. A.s.III about as long as a.s.V, about 8/10 a.s. IV; a.s.VI with unguis averaging 5 ⅓ times (range = 3.86–6.89, n = 17) length of base.

Dorsal body integument smooth on disk becoming imbricate-spiculate caudally; densely covered with funnel- or cone-shaped setae. Cauda .25–.30 (.266, n = 9) mm long; stoutly elongate, without basal constriction, apex broadly rounded; spiculate; with 2 pairs lateral and 1 posterodorsal setae. Cornicles .66–1.02 (.869, n = 21) mm long, 2½ to 4 times (3.25 ± .22, n = 17) as long as cauda; cylindrical, with slightly thicker bases; densely imbricate, wrinkled, without spicules. Legs with 3, 3, 3 hairs on first tarsal joints; hind tibiae 1.05–1.72 (1.46, n = 18), hind ta–2 .12–.15 (.139, n = 15) mm long. Rostrum IV+V with distal ⅓ produced into thick, slightly convex-sided, not cylindrical “needle”; .135–.15 (.143, n = 11) mm long, .93–1.15 (1.03 ± .05, n = 15) times length of hind ta–2; with 1 basal, 2 dorsal, and 3 lateral pairs of setae, ml and pl ⅓ to ½ al in length.

Measurements (in mm) of holotype: BL 2.40, We .58; a.s.III both .82, a.s.IV .92 and .91, a.s.V .73 and .79, a.s.VI .24 + 1.34 and .23 + 1.38; cornicles 1.0 and 1.02, cauda .30; hind tibiae 1.71 and 1.70, hind ta–2 both .15, and rostrum IV+V .14 mm.

Alate Viviparous Female: Unknown.

Sexuales: Unknown.

HOSTS.—Artemisia longifolia, Artemisia sp.

DISTRIBUTION.—Aside from type-locality, P. longinectarius is recorded from Yellowstone National Park in Wyoming (Knowlton, 1954), and Mt. Timpanogos in Utah (Palmer, 1952:261). Its occurrence in Canada (Alberta and Manitoba) is reported here for the first time.

SPECIMENS EXAMINED.—Holotype (USNM) and 12 paratype apt.v.f., with same data as holotype (CSU); 1 apt.v.f., Lethbridge, Alberta, Canada, 28–VII–1946, GFK, on Artemisia sp. (GFK coll.); and 1 apt.v.f., Glenlea, Manitoba, 17–VI–1965, on suction trap (AGR coll.).

Pleotrichophorus longipes (Gillette and Palmer)

Macrosiphum longipes Gillette and Palmer, 1928:1–2 [types: 23 apt.v.f., 2 al.v.f., Log Cabin, Colorado, 30 July 1926, on Artemisia tridentata; Rustic (Larimer Co.) Colorado, 7:3026; AC 2075; USNM 41969]; 1934:186.—Knowlton and Allen, 1938:81.

Capitophorus longipes (Gillette and Palmer).—Palmer, 1952: 261–262.

Pleotrichophorus longipes (Gillette and Palmer).—Hille Ris Lambers, 1969:168.

DIAGNOSIS.—This species is unique among Pleotrichophorus species in the presence of 4–6 hairs on the basal half of the cornicles. It resembles P. sporadicus in dorsal head chaetotaxy but the posterior df’s are of same shape and size as the anterior ones. It differs, further, from this species in having the cornicles entirely dark instead of only the distal half, and in the presence of 2 lateral pairs (vs. 5–8 pairs) of caudal setae.

DESCRIPTION.—Apterous Viviparous Female: Color in life bluish apple green and slightly pruinose (Palmer, 1952:261); cleared specimen pale green, with dark brown antennae, cornicles, sides of femora, entire tibiae and tarsi, and last 2 rostral segments. Body rather long and narrowly spindle-shaped, 2.45–2.97 (2.66, n = 6) mm long, .65–.67 (.658, n = 6) mm wide across eyes. Head with large, conspicuously protruding compound eyes and indistinct ocular tubercles; laterofrontal tubercles well developed, mesofrontal area hardly produced; mf 1p, lf 1–2 (usually 1) on each tubercle, vlf 1p, df 10 (10.00 ± 2.57, n = 6), vf 6–8 (usually 6), pc 1–3 (usually 2) p, ac 4–5, md 3–4 on each side; dorsal and ventral setae long, thin, widest near bases, tapering gradually, extreme apices slightly knobbed; mf .0660–.0858 (.0781, n = 6), df–1 .0660.0880 (.0760, n = 11) mm long. Antennal segment I slightly produced mesodistally, faintly imbricate, with 3–12 elongate, knobbed setae in addition to basal pointed one on dorsum. A.s.II with knobbed setae. A.s.III slightly imbricate; with rather long knobbed setae, longest equal to or slightly longer than basal diameter of segment; bearing 1–2 (1.55, n = 11 sensoria). Other flagellar segments incomplete in specimens seen but Gillette and Palmer (1928:1) give following measurements: a.s.III .99–1.16, a.s.IV 1.03–1.23, a.s.V .90–1.05, and a.s.VI .20 + 1.12–1.45 mm.

Dorsal body integument rather smooth, becoming very faintly striate on last abdominal segment; dorsal body setae sparse, consisting of irregularly arranged spinal, pleural, and marginal rows of 1–3 setae per row on each segment, setae of similar shape to those on head. Cauda .32–.38 (.355, n = 6) mm long; stoutly elongate, not noticeably constricted basally, with broadly rounded apex; spiculate; with 2 lateral pairs and 1 (sometimes 2 or 3) posterodorsal setae. Cornicles 1.06–1.44 (1.21, n = 6) mm long, 3 to 3 ¾ times (3.36 ± .32, n = 6) as long as cauda; cylindrical, with faintly incrassate bases and apices; imbricate, dark brown from near bases, becoming slightly paler on apical 1/5 to ¼; bearing 4–6 slightly knobbed setae on outer basal margin. Legs with 3, 3, 3 hairs on first tarsal joints. Last rostral segment .14–.15 (.145, n = 6) mm long, about 8/10 (range = .78–.83) length of 2nd hind tarsal segment; apical ½, beyond pl setae, produced into sharply pointed “needle”; with 1 basal, 2 dorsal, and 3 lateral pairs of setae, ml and pl about ½ length of al setae.

Alate Viviparous Female: Not seen. Gillette and Palmer (1928:2) give the following measurements: BL 2.40; a.s.III 1.05–1.10, a.s.IV 1.0–1.24, a.s.V .90–1.02, a.s.VI .20 + 1.45; cornicles 1.0, cauda .26; and hind tibiae 2.60 mm. Number of sensoria on a.s.III 1–12.

Oviparous Female: Not seen. According to Palmer (1952:262), measurements are much like those of apterous vivipara but cauda relatively stouter, the width being “greater than ½ its length”, and bearing 3 pairs lateral and 4 scattered dorsal setae.

Male: Not seen. Palmer (1952:262) gives the following descriptions and measurements: apterous; BL 2.0, antennae 4.5, cornicles .60–.70, and cauda .13–.15 mm; sensoria small and numerous on a.s.III and IV and absent on a.s.V.

HOSTS.—Artemisia tridentata, Artemisia sp.

DISTRIBUTION.—Recorded from northern portions of Colorado and Utah.

SPECIMENS EXAMINED (all in EOE coll.).—4 apt. v.f. and 5 apt.ny., Allen Creek, Utah, 11–VII–1956, GFK, on Artemisia sp; and 2 apt.v.f., Willard Peak, Utah, 6–VII–1956, GFK, on unknown host.