78 MISC. PUBLICATION 174, U.S. DEPT. OF AGRICULTURE 



Subapterous female. — Length 1 to 2.3 mm. Head much broader than the 

 thorax, thick antero-posteriorly, about twice as broad as thick at the middle; 

 occiput slightly concave, distinctly margined by a delicate carina ; ocelli in a 

 low triangle, the postocellar line a little longer than the ocellocular, the latter 

 equal to two or three times the diameter of an ocellus ; temples receding, less 

 than half as wide as the eyes; antennal scrobes very shallow, almost absent, 

 the frons slightly convex; head viewed from in front broader than high (about 

 30:25) ; cheeks rounded; malar space equal to approximately one third the 

 eye height ; the malar furrow nearly effaced ; eyes ovate, bare ; clypeus not 

 distinctly separated from the face, its anterior margin straight; clypeal area 

 convergently striated, the rest of head strongly reticulate-punctate, this sculp- 

 ture a little deeper on the frons than elsewhere ; mandibles rather stout, each 

 with four teeth ; maxillary palpi 4-jointed, the apical joint nearly as long as 

 the other three together ; labial palpi 3-jointed. Antennae inserted a little above 

 a line connecting the lower margins of eyes, 13-jointed, weakly clavate; scape 

 cylindrical, attaining nearly the front ocellus; pedicel a little more than twice 

 as long as thick, very slightly longer than first funicle joint together with the 

 ring joints ; two distinct ring joints, the first usually about half as large as the 

 second, both transverse; first and second funicle joints subequal and each 

 usually a little longer than broad, sometimes quadrate ; funicle joints 3 to 6 

 subquadrate or slightly transverse; club 3-jointed, not quite so long as the 

 three preceding joints, ovate, rounded at apex ; elongate sensoria consisting of 

 a single series on each of the funicle and club joints. Thorax a little less than 

 twice as long as broad ; prothorax short, pronotum strongly declivous and trans- 

 versely lineolated or reticulated in front, the dorsal portion strongly transverse, 

 a little wider laterally than at the middle, on a plane a little lower than meso- 

 notum, reticulate-punctate, its anterior margin subacute without a marginal 

 carina ; mesoscutum convex, twice as broad as long, finely reticulate-punctate, the 

 punctures close and deep, the parapsidal grooves very faintly indicated anteri- 

 orly, entirely effaced posteriorly; scutellum weakly convex, about as long as 

 mesoscutum and similarly sculptured ; axillae broadly separated and sculptured 

 like scutellum ; propodeum about as long as scutellum, with a broad neck which 

 is set off by a slight transverse depression at its base, without a median carina, 

 the lateral folds usually indistinct except basally, the area between the folds 

 and on neck with deep and rather coarse reticulate-punctate sculpture, laterad 

 of the folds mostly smooth ; spiracles small, subelliptical ; spiracular grooves 

 shallow and reticulate-punctate. Wings consisting of short hyaline stubs which 

 usually do not extend beyond the base of propodeum. Legs normal, the hind 

 tibia with one apical spur. Abdomen conic-ovate, subpetiolate, about as long as 

 head and thorax together and usually a little broader than thorax, convex above, 

 nearly smooth but with some very faint reticulations on all the tergites, the 

 first tergite (not counting the petiole; constituting half or a little less than half 

 its total length, the second usually equal to approximately one fourth the first, 

 the third to fifth tergites subequal or successively diminishing slightly in length, 

 the sixth and seventh a little longer and subequal; first to fourth tergites each 

 with a single transverse row of pale hairs, following tergites with more than 

 one row ; apex of ovipositor sheaths barely exserted. 



General color aeneous; abdomen black, the first tergite usually more or less 

 metallic green; flagellum black; scape, pedicel, and all legs, including their 

 coxae, usually pale testaceous ; mandibles testaceous with their teeth dark 

 brown; palpi more or less metallic. 



Winged female. — Like the subapterous form except in the following particu- 

 lars : The wings may vary from less than half normal in size to fully developed. 

 The fully developed fore wing extends a little beyond apex of abdomen and is 

 about two and one half times as long as broad, bare behind marginal vein, 

 normally ciliated beyond; marginal cilia short; submarginal vein more than 

 twice as long as marginal ; postmarginal and marginal veins subequal ; stigmal 

 vein two thirds as long as marginal, curved, slightly thickened at apex, the 

 stylet usually distinct. In individuals having the wings smaller than normal, 

 the postmarginal and stigmal veins may be equal and less than half the mar- 

 ginal, the stigmal vein not at all thickened at apex, and the stylet may be 

 entirely absent. The lateral folds on propodeum are usually distinctly devel- 

 oped from base of propodeum to the base of the propodeal neck. The head is 

 usually a little less thick antero-posteriorly, in some individuals fully three 

 times as broad as long as viewed from above, The body color may vary from 



