436 AMERICAN HYMENOPTERA. 



orbital line toward the bases of the antennae, the lateral ones not more 

 than half their diameter from the inner margins of the eyes ; eyes 

 greatly swollen and often peculiarly pinkish in color ; the vertex 

 above the ocelli very slightly narrower than at the ocelli. Flagellum 

 of antennae fully three times as long as scape ; third and fifth an- 

 tennal segments subequal in length, fourth much shorter than either. 



Thorax. — Anterior part of dorsum and the scutellum entirely covered 

 with yellow pile, with a broad, but usually poorly defined (there being 

 often a strong admixture of yellow hairs on the sides) black interalar 

 band between. Mesopleura variable, sometimes covered with yellow 

 to bases of legs and sometimes yellow for only a short distance below 

 the level of the bases of the wings as in the females ; metapleura and 

 sides of median segment all black. 



Abdomen. — Dorsum : first two segments covered with yellow pile ; 

 third segment sometimes entirely black, sometimes with considerable 

 yellow on the sides ; fourth segment entirely black, partly black and 

 partly ferruginous (of varying shade), or entirely ferruginous ; fifth 

 segment variable in the same way and with the same colors as the 

 fourth ; sixth and seventh segments entirely covered with ferruginous 

 (of varying shade) pile. Venter clothed with black pile, the two api- 

 cal segments sometimes with some light ferruginous hair. 



Genitalia. — Outer spatha (fig. 117) very broad, about one-fourth as 

 long, from anterior to posterior border along the middle line, as wide, 

 between extreme side margins ; anterior lateral projections rounded ; 

 anterior border broadly and evenly incurved ; posterior border broadly 

 and evenly outcurved ; posterior half of ventral surface covered with 

 scattered hairs, somewhat thicker and longer on the sides than on 

 the middle. Inner spatha (fig. 130) with median portion of anterior 

 border broad and thickly chitinized and side portions curved strongly 

 backwards ; posterior part of ventral surface covered with moderately 

 long hairs, with a very small , somewhat elongated median fenestra some 

 distance from the posterior border, encircled by an elongated tuft of hairs. 

 Claspers (figs. 81 and 88) rather thick and powerful in appearance, but 

 somewhat suddenly more slender toward the apex. Branches broad 

 at base, but narrowing rapidly toward the apex, their apices narrow 

 and rounded as seen from dorsal side. Volsellae very broad to about 

 the ends of the branches, from there tapering rapidly; apical projec- 

 tions with outcurved and serrate margins. Squamae deeply and acutely 

 emarginate on inner side, the outer lobe being more than twice as 

 large as the inner one and rather acutely rounded at apex ; membrane 

 rather large and noticeable. Heads of sagittae irregularly sickle- 

 shaped, the base of the sickle being very broad, the apex sharply 

 pointed, and the outer border more or less serrate and forward bent. 

 Uncus very broad, its strongly recurved portion tapering rapidly to a 

 rather narrow and emarginate apex. 



