Orgilus ablusus Muesebeck 1970

Ont., Minn.

Orgilus ablusus

This is one of three species treated in this paper with unusually slender hind femora; in this character it resembles femoralis, new species, and exilis, new species, from both of which it may be readily distinguished as shown in the key.

FEMALE.—Length 3.8 mm. Head distinctly wider than thorax, in dorsal view 1.7 times as wide as long; face in holotype 1.8 times as wide as eye height, minutely punctate and in large part shiny, but along the eye margins the surface is shagreened and somewhat mat; clypeus shiny, with well-separated minute punctures; malar space just about half as long as eye height, shagreened and mat; cheeks also shagreened and mat; temples hardly 0.75 as wide as eyes, polished along eye margins but broadly shagreened and mat along occipital margin and below; occipital carina rather broadly interrupted medially; vertex smooth and shiny; ocellocular line about 3 times, postocellar line more than twice, as long as diameter of an ocellus; antennae of holotype 31-segmented, even the shortest flagellar segments at least as long as broad.

Thorax rather slender; mesoscutum shiny, the lateral lobes impunctate and polished, the median lobe with very shallow, rather closely placed punctures that fade out on the posterior part of the lobe; notauli sharply impressed, finely foveolate, disc of scutellum slightly convex, smooth and polished, impunctate; propodeum largely rugulose but with a small triangular polished area each side of the middle at base, the open apical areas rather distinctly set off by well-developed stubs of longitudinal carinae; side of pronotum rugulose and shiny except for a small area at anterior margin that is very finely granulose and dull; mesopleuron smooth and polished, the longitudinal furrow a little sinuate and evenly finely foveolate; metapleuron rugulose except for a small smooth area in the upper anterior angle. Hind coxa very weakly rugulose on dorsal edge at base, otherwise finely granulose above and on upper part of outer side; hind femur fully twice as long as hind coxa and very nearly or quite six times as long as wide; inner calcarium of hind tibia more than half as long as metatarsus; tarsal claws simple. Stigma about as long as radial cell on wing margin; nervulus just postfurcal; hind wing 4.3 times as long as wide; lower abscissa of basella about as long as nervellus and about one-third as long as mediella or maximum width of hind wing.

Abdomen slender, narrower than thorax; first tergite more than 1.5 times as long as wide at apex, the spiracles a little more than twice as far from apex as from base and the distance between them only slightly more than their distance from base, the tergite closely rugulose, longitudinally so laterally; second tergite as long as wide at base, parallel-sided, smooth and polished except for a very small area basally each side of middle which is faintly rugulose punctate; second suture faint; remainder of dorsum of abdomen smooth and polished; ovipositor sheath fully as long as propodeum and abdomen combined.

Black; lower part of clypeus and the mandibles ferruginous; antennal scape blackish, the flagellum reddish yellow on basal half and becoming gradually darker beyond middle, nearly black at apex; legs ferruginous, the hind coxa somewhat darkened on lower edge and on basal part of upper edge, each of the femora with a blackish streak on inner side above; hind tibiae slightly darkened at apices and all tarsi darkened; tegulae and wing bases yellow; wings distinctly infumated, the radiella and cubitella of hind wings clearly somewhat pigmented.

MALE.—Unknown.

HOLOTYPE.—In the Canadian National Collections.

DISTRIBUTION.—Known only from a single female collected at Chatterton, Ontario, 25 August 1948, by J. C. Martin.