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



the sixth slightly broader than long; club distinctly 3-jointed, elongate ovate, 

 not so long as the last three funicle joints combined ; each funicle and club 

 joint with a single series of elongate sensoria which extend about two thirds 

 the length of each segment. Thorax about one and one half times as long as 

 broad ; pronotum short, mostly declivous, the dorsal portion shorter than in 

 fulvipes, immargined ; mesoscutum twice as broad as long, the parapsidal 

 grooves sharply impressed for approximately two thirds the length of mesoscu- 

 tum, effaced posteriorly; scutellum about as long as mesoscutum, moderately 

 convex; axillae broadly separated at base; the punctures on mesoscutum 

 close, those on posterior middle slightly larger and deeper than elsewhere ; 

 punctures on scutellum a little finer and shallower than on mesoscutum ; axillae 

 sculptured like scutellum ; propodeum shorter than scutellum with a prominent 

 neck which is constricted at base above, lateral folds distinct and complete and 

 a median carina usually present ; the area between the folds much more 

 closely punctate than the scutellum, laterad of the folds mostly smooth or 

 weakly shagreenecl and hairy ; spiracular sulci impressed and usually not 

 foveolate ; spiracles elongate ovate or elliptical. Legs normal. Fore wing about 

 two and one half times as long as broad, bare at base for the whole length of 

 submarginal vein, marginal cilia short; submarginal vein a little more than 

 twice as long as marginal ; postmarginal vein longer than marginal ; stigmal 

 vein three fourths as long as marginal, only slightly thickened at apex, the 

 stylet usually present but short; hind wing more than three times as long as 

 broad and reaching nearly to apex of abdomen in normally winged individuals. 

 Abdomen conic-ovate, as long as head and thorax or nearly so, about as broad 

 as thorax, convex above, and practically smooth; first tergite (except the very 

 ■short petiole) distinctly broader than long, forming approximately one third 

 the length of abdomen, perfectly smooth and bare except for a patch of hairs 

 on each side near base; second tergite one third to nearly one half as long as 

 first, smooth or with only very faint traces of reticulation, and bare; third to 

 fifth tergites subequal, and each about half as long as second, the third and 

 fourth bare, the fifth with a transverse row of short hairs ; sixth nearly as long 

 as second, faintly reticulated and sparsely hairy; seventh short; ovipositor 

 sheaths barely showing at apex. 



Color dull greenish with a slight aeneous tinge ; abdomen shining black with 

 an aeneous tinge, the first tergite often more or less bluish or greenish ; anten- 

 nae black or blackish with the pedicel and most of scape fuscous or dark brown, 

 the base of scape testaceous ; all coxae concolorous with the thorax ; femora, 

 tibiae, and tarsi varying from bright testaceous to dark brown, the femora 

 usually somewhat darker than their tibiae ; wings hyaline. 



Male. — Length 1.4 to 1.9 mm. Antennae more slender than in the female, and 

 less clavate; pedicel about as long as ring joints and first funicle joint; ring 

 joints nearly equal; first funicle joint variable, usually distinctly longer than 

 broad, but less than twice as long as broad, frequently no longer than broad ; 

 sixth joint quadrate; club slender, conico-cylindrical, and about equal to the 

 three preceding joints; wings fully developed like those of the female and 

 reaching much beyond apex of abdomen. Abdomen retracted apically in dead 

 specimens, the first tergite transverse but constituting half or more than half 

 the length of abdomen and 2 or 3 times the length of the second tergite, the 

 following tergites often almost entirely retracted. 



Color more strongly aeneous than in the female, the frons often brassy green. 

 The eyes vary in size from nearly normal, as in the female, to much larger 

 than those of the female. In specimens with small eyes the malar space is 

 often fully half as long as the eye, the ocellocular line is more than twice as 

 long as the diameter of an ocellus, and the frons is broad ; while in those with 

 large eyes the malar space is sometimes less than one fourth the length of the 

 eye, the ocellocular line is scarcely longer than the diameter of an ocellus, and 

 the frons is correspondingly narrowed. So far as the material at hand shows, 

 the wings are always developed and functional, but they vary to some extent 

 in size. None has been seen in which the wings do not extend beyond the apex 

 of the abdomen. 



The difference between small-eyed and noiinal-eyed males of this species is 

 :so striking that with only a few specimens for examination one would hardly 

 suspect that the two forms are the same species. Examination of a large 

 number of specimens shows considerable gradation but still might leave one 

 in some doubt as to the real relationship. That the two forms are the same 

 species, however, is definitely proved by the series of bred specimens bearing 



