Orgilus rostratus Muesebeck 1970

Md., Ohio, Wyo., Colo.

Orgilus rostratus

The rostriform head distinguishes this form from all other known species with a long stub of the third abscissa of cubitus except dreisbachi, new species, from which rostratus differs in its rather strongly infumated wings, longer malar space and receding temples.

FEMALE.—Length around 3.3 mm. Head barely wider than thorax, a little excavated behind, in front view higher than its greatest width, and in dorsal view nearly twice as wide as long; face minutely punctate, its straight-line width just about equal to eye height; malar space fully 0.6 as long as eye height and nearly twice as long as longest segment of maxillary palpus, which is about as long as the exposed part of the galea; maxillary palpi considerably shorter than height of head; anterior tentorial pits much below level of lower eye margins; temples and cheeks gradually receding, the former at mideye point about half as wide as eyes, smooth and shining; ocellocular line a little less than twice as long as diameter of an ocellus; occipital carina broadly interrupted medially; antennae hardly as long as the body, 25- to 27-segmented in the available specimens, none of the preapical segments wider than long, the apical segment without a terminal spicule.

Lobes of mesoscutum only weakly convex, the middle lobe completely minutely punctate like the face; the lateral lobes smoother; notauli completely and very finely foveolate; scutellar disc small, finely and sparsely punctate; propodeum gradually declivous, coarsely rugose, the apical areas set off by very prominent stubs of longitudinal carinae that arise from posterior margin, which is very strongly reflexed at the lateral angles; lateral face of pronotum rugose or rugose punctate in the impression, finely rugulose before the impression and nearly smooth above and behind it; mesopleuron polished, the longitudinal furrow coarsely foveolate; metapleuron rugose posteriorly, usually coarsely punctate anteriorly. Hind coxa 0.75 as long as hind femur, weakly roughened above basally, otherwise smooth; hind femur only about three times as long as its maximum width; longer calcarium of hind tibia hardly half as long as metatarsus, tarsal claws simple. Radial cell on wing margin just about as long as stigma; second abscissa of radius on a line with intercubitus; stub of third abscissa of cubitus longer than second abscissa, which is not more, usually less, than half as long as intercubitus; nervulus slightly postfurcal; hind wing 4.5 times as long as wide; lower abscissa of basella much longer than nervellus and about half as long as mediella.

Abdomen not longer, and at its widest point a little wider, than thorax; first tergite barely longer than wide at apex, and with two very prominent dorsal keels extending from the base to the middle, the surface of the tergite largely rugulose punctate; second tergite twice as broad on posterior margin as long and closely punctate or granulose; third and fourth tergites usually partly punctate or granulose; the following usually smooth and shiny but sometimes a little roughened; ovipositor sheath just about as long as the abdomen, the ovipositor strongly decurved at the apex.

Head and thorax brown to black, usually largely or entirely black; wings rather uniformly infumated; legs brownish, the apices of the hind femora, and the tibiae and tarsi sometimes, more or less darkened; abdomen usually brown.

MALE.—In essential characters like the female.

HOLOTYPE.—USNM 70191.

DISTRIBUTION.—Colorado, Wyoming, Ohio, Maryland. The type-series consists of the following: Holotype female from Steamboat Springs, Colorado, collected 21 July 1896, by C. Liebeck; 2 females taken at the Jackson Hole Biological Station, Moran, Wyoming, August 1961, by H. E. Evans; 1 female from Hyattsville, Maryland, collected 1 September 1912, by “Knab and Malloch”; and 2 males, in the Canadian National Collection, taken at Steubenville, Ohio, 4 September 1950.