Orgilus compactus Muesebeck 1970

Oreg.

Orgilus compactus

In habitus this species rather closely resembles gramineus, new species, but it is readily separable as pointed out in the description of that species. It is apparently even more similar to cognatus, new species, and clivicola, new species, which it resembles in the short ovipositor and in the retraction of the apical abdominal segments. From both it may be at once distinguished, however, by its shorter malar space, stouter female antennae, and deep black color.

FEMALE.—Length 3.1 mm. Head not wider than thorax, in dorsal view 1.6 times as wide as long; face barely wider than eye height (in ratio of 63:60), very smooth and shiny but with some minute well-separated punctures; malar space not longer than clypeus and only slightly more than 0.4 as long as eye height; shiny and only faintly alutaceous; cheeks smooth and very shiny, faintly alutaceous only below; temples smooth and polished, about 0.75 as wide as eyes; occipital carina broadly interrupted medially; ocellocular line more than twice as long as diameter of an ocellus; antennae stout, 29-segmented in the single specimen in which they are complete, most of the segments beyond the fifteenth clearly wider than long.

Thorax stout; mesoscutum very smooth and shiny, only weakly punctate anteriorly on the middle lobe; notauli sharply impressed, finely foveolate; disc of scutellum small, convex, smooth, and polished, impunctate; propodeum finely rugulose, narrowly smooth and polished on a small transverse area each side of middle at extreme base, and more or less smooth and shiny at apex, the stubs of longitudinal carinae arising from the posterior margin not well developed and the apical areas, therefore, poorly indicated; side of pronotum finely rugulose, nearly smooth below upper margin; mesopleuron smooth and polished, the longitudinal furrow finely foveolate; metapleuron smooth and shiny anteriorly, rugulose posteriorly. Hind coxa granulose above toward base, largely smooth and very shiny on outer side; hind femur less than twice as long as hind coxa and about 4.3 times as long as wide; inner calcarium of hind tibia slightly more than half as long as metatarsus; tarsal claws simple. Radial cell on wing margin a little shorter than stigma; second abscissa of radius on a line with intercubitus; first abscissa of radius much longer than width of stigma; stub of third abscissa of cubitus at least as long as second abscissa; nervulus slightly postfurcal; hind wing about 4.8 times as long as wide; lower abscissa of basella longer than nervellus but less than half as long as mediella or maximum width of hind wing.

Abdomen short and stout; first tergite at least 0.8 as broad at apex as long, finely rugulose, the dorsal keels not developed, the spiracles about twice as far from each other as from base of segment; second tergite about 1.3 times as broad at base as long, largely smooth and shiny, weakly rugulose basally each side of the middle; second suture fine but sharply impressed; third and fourth tergites smooth and shiny, the remainder retracted; ovipositor sheath just about as long as abdomen, the ovipositor weakly decurved at apex.

Black; clypeus entirely black; mandibles black or blackish; palpi piceous; antennae brownish black; legs yellowish brown, the hind coxae largely black, the hind femora broadly darkened apically, the fore- and middle femora darkened along dorsal edges, the hind tibiae basally and apically and all the tarsi dark, tegulae and wing bases blackish; wings slightly infumated; dorsum of abdomen deep black, the venter piceous to black.

MALE.—Unknown.

HOLOTYPE.—USNM 70151.

DISTRIBUTION.—Known only from two females (one the holotype) collected at Hood River Rapids, Mt. Hood, Oregon, 3000 feet, on 31 July 1921, by A. L. Melander.