Orgilus femoralis Muesebeck 1970

N. Dak., Colo., Idaho.

Orgilus femoralis

In habitus and in some details this species resembles mundus, new species; but it may be readily distinguished by its unusually slender hind femora, its smooth second tergite and its yellow tegulae and palpi.

FEMALE.—Length about 4 mm. Head about 1.2 times as wide as thorax, in dorsal view 1.5 times as wide as long; face about 1.25 times as wide as eye height, very shiny, more or less roughened just below antennae, otherwise smooth and shiny with only indistinct punctures; clypeus shiny, with a few weak punctures; malar space shagreened and mat, much longer than clypeus and 0.57 as long as eye height; cheeks finely shagreened; temples more than three-fourths as wide as eyes, gradually receding, smooth, and shiny except along posterior margins where they are a little shagreened; occipital carina narrowly interrupted at the middle; frons smooth and polished except for a small shagreened area adjacent to each eye; vertex polished; both ocellocular line and postocellar line more than twice as long as diameter of an ocellus; antennae of the two known specimens incomplete.

Thorax slender; mesoscutum smooth and shiny, the middle lobe with a few weak punctures; notauli sharp, deep, finely foveolate; disc of scutellum convex, longer than wide, smooth and polished; propodeum rugulose, with a small, smooth and polished area each side of the middle at base, and with the apical areas set off by rather poorly developed stubs of the carinae that arise from the posterior margin of the propodeum; side of pronotum closely rugulose; mesopleuron smooth and polished, the longitudinal furrow nearly straight and finely foveolate; metapleuron largely closely rugulose, only smooth in the upper anterior angle. Hind coxa rugulose at base above, punctate and shiny on outer side; hind femur twice as long as hind coxa and very nearly six times as long as its maximum width; inner 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 about as long as second abscissa; nervulus slightly postfurcal; hind wing about 4.3 times as long as wide; lower abscissa of basella not or barely longer than nervellus and much less than half as long as mediella.

Abdomen slender, a little narrower than thorax; first tergite 1.5 times as long as broad at apex, largely finely, longitudinally rugulose, the dorsal keels distinct to beyond the spiracles; second tergite very slightly longer than broad at base, smooth and shiny, at most with a little faint shagreening toward base; remainder of abdomen smooth and shiny; ovipositor sheath just about as long as head, thorax, and abdomen combined.

Black; clypeus reddish yellow apically; palpi yellowish; antennae basally yellow or brownish yellow, darkened apically; legs brownish yellow, the hind coxae more or less extensively blackish basally and each of the femora with a dark streak along inner side near upper edge; tarsi usually pale; tegulae and wing bases yellow; wings slightly infumated; third and following tergites largely dark brown.

MALE.—Unknown.

HOLOTYPE.—USNM 70163.

DISTRIBUTION.—Known only from the holotype female collected at Hollister, Idaho, 4 May 1931, by D. E. Fox, and one paratype female taken by C. F. Baker at Fort Collins, Colorado, 6 December 1892, “under a stone along the roadside.”