Orgilus maculiventris (Cresson 1872)

Orgilus maculiventris (Cresson)

Eubadizon maculiventris Cresson, 1872b, p. 178.

Oresimus maculiventris (Cresson).—Ashmead, 1900, p. 123.

This name has been generally misapplied since its original publication. It has been used for what is, in fact, lateralis (Cresson). Recent study of the holotype has reestablished the identity of the species. It may be readily distinguished from lateralis by its elongate form and longer antennae and by the longitudinal sculpture of the basal three tergites.

FEMALE.—Length around 5 mm. Head a little wider than thorax, in dorsal view about 1.8 times as broad as long; face rather flat and very finely punctate and shiny, its width about equal to the eye height; clypeus not separated from the face medially; anterior tentorial pits on a line with lower eye margins; malar space a little less than one-third as long as eye height; cheeks and lower temples finely granulose and mat; temples about half as wide as eyes and rather strongly receding; vertex smooth; occipital carina complete though weak medially; ocellocular line twice as long as the distance between the lateral ocelli, which is about equal to the diameter of one of them; antennae 39-segmented in the only available female specimen with complete antennae, all segments of the flagellum longer than broad, the apical segment with a short terminal spicule.

Thorax more than twice as long as wide; mesoscutum smooth; notauli finely foveolate; propodeum only slightly declivous caudad, rugulose punctate medially, smooth toward the sides, stubs of longitudinal carinae arising from posterior margin and setting off five apical areas that are open in front; side of pronotum, mesopleuron, and metapleuron smooth and polished, the longitudinal mesopleural furrow sinuate and finely foveolate; prepectal carina strong, attaining anterior margin of mesopleuron. Hind coxa nearly smooth, 0.7 as long as hind femur, the latter a little more than four times as long as wide and closely punctate and shiny on the outer side; inner calcarium of hind tibia a little more than half as long as metatarsus; tarsal claw with a well-developed subbasal tooth. Radial cell on wing margin at least one and one-half times as long as stigma, nearly attaining apex of wing; stigma nearly four times as long as wide; spur of third abscissa of cubitus little more than punctiform; nervulus interstitial or very slightly postfurcal; hind wing about 4.5 times as long as wide; lower abscissa of basella much longer than nervellus and a little more than half as long as mediella or maximum width of hind wing.

Abdomen distinctly longer than head and thorax combined and only two-thirds as wide as the thorax; first tergite fully twice as long as wide at apex, longitudinally rugulose, abruptly impressed at extreme base and slightly constricted immediately behind the spiracles, which are farther from each other than from the base of the segment and more than three times as far from the apex as from the base; second tergite conspicuously longer than broad at base, nearly parallel-sided, and longitudinally rugulose striate; third tergite sculptured like the second but more weakly; the remaining tergites smooth and shiny; ovipositor a little decurved at apex, the sheath about as long as head, thorax, and abdomen combined.

Reddish yellow; palpi slightly darkened; antennae brownish yellow beneath, dark brown above; stemmaticum, usually a large elongate spot on each mesonotal lobe, propodeum except along the sides, first tergite largely, second tergite except narrowly at the sides and a median spot on each of the following tergites, black or blackish; legs reddish yellow, extreme apices of middle and hind femora and of middle tibiae blackish, the hind tibia blackish, with a yellowish-white annulus at extreme base and a yellowish-brown streak covering the middle half of the posterior surface, and all the tarsi more or less darkened, the posterior pair nearly black; tegulae yellow; wings hyaline. There is considerable variation in the extent of the dark markings; occasionally the thorax and abdomen are entirely yellow.

MALE.—Agrees in all essentials with the female. The antennae of the available males are 37-segmented.

HOLOTYPE.—In the Academy of Natural Sciences of Philadelphia.

DISTRIBUTION.—The holotype is from Comal County, Texas. Other specimens I have seen are from Brookline, Massachusetts, Falls Church, Virginia, (reared from Antaeotricha humilis (Zeller), Mt. Pleasant, Florida, and Opelousas, Louisiana.