Orgilus dolosus Muesebeck 1970

Ont.

Orgilus dolosus

Although very similar to dissidens, new species, this species may be readily distinguished by its stouter abdomen, with the second tergite wider than long and not parallel-sided, and by the much stronger sculpture of the mesonotum and mesopleuron.

FEMALE.—Length about 3.5 mm. Head very slightly wider than thorax, in dorsal view 0.6 as long as wide; face 1.25 times as wide as eye height, closely and rather strongly punctate and subopaque; clypeus more sparsely punctate and shiny; malar space longer than clypeus and fully half as long as eye height, finely granulose and dull; cheeks strongly shagreened and mat; temples about 0.75 as wide as eyes, smooth and polished adjacent to eyes, shagreened along occipital carina; vertex finely granulose and dull between lateral ocelli and eyes; occipital carina narrowly interrupted medially; ocellocular line about two and one-half times as long as diameter of an ocellus; antennae of holotype 32-segmented, a few of the preapical segments of flagellum as wide as long.

Mesoscutum with the middle lobe finely rugulose punctate and the spaces between the large, elongate and shallow punctures more or less shagreened, the lateral lobes similarly but much more weakly sculptured; disc of scutellum with shallow punctures and faint shagreening between the punctures; the propodeum rugose, the stubs of the longitudinal carinae that arise from the posterior margin rather prominent and setting off the apical areas; side of pronotum strongly rugulose over most of its surface, granulose on a narrowly triangular area at anterior margin and very weakly rugulose and shiny just below upper margin; mesopleuron with the longitudinal furrow coarsely foveolate, the surface below it rugulose punctate and an area below the tegula strongly rugose, also an elongate area beginning at the posterior margin and extending for a distance along the upper edge of the longitudinal furrow finely aciculate; metapleuron largely rugose, very coarsely so below and posteriorly, and coarsely granulose and dull in the anterior upper angle. Hind coxa strongly granulose and dull on outer and inner sides, weakly rugulose on dorsal edge; hind femur twice as long as hind coxa and about 4.8 times as long as wide; inner calcarium of hind tibia barely more than half as long as metatarsus; tarsal claws simple. Radial cell on wing margin fully as long as stigma; second abscissa of radius on a line with intercubitus; stub of third abscissa of cubitus as long as second abscissa; nervulus postfurcal by more than one-third its length; hind wing a little more than four times as long as wide; lower abscissa of basella less than half as long as mediella.

Abdomen rather stout, at widest point as broad as thorax; first tergite about 0.8 as wide at apex as long and closely, finely rugulose, the spiracles less than twice as far from apex as from base and about as far from each other as from base; second tergite about 1.2 times as broad at base as long, finely rugulose punctate on basal two-thirds except for broad polished lateral margins and a polished median triangular area at base, the apex of the tergite broadly polished; third and following tergites smooth and polished; second suture fine but sharply impressed; ovipositor sheath as long as the distance from the base of the scutellum to the apex of the abdomen.

Black; clypeus ferruginous anteriorly; mandibles yellow; palpi piceous; scape of antenna blackish above and testaceous below, flagellum testaceous on more than basal half below, on less than that above, remainder darkened; legs testaceous, hind coxae black except at apices, hind femora a little darkened on inner side and the tarsi very slightly darkened; tegulae and wing bases yellow; wings slightly infumated; basal abdominal sternites yellow.

MALE.—Unknown.

HOLOTYPE.—In the Canadian National Collections.

DISTRIBUTION.—Known only from the holotype female that was collected by J. C. Martin, 22 May 1956, at Chatterton, Ontario.