6 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 70 



Black and j^ellow, the amount of yellow being extremely variable. 

 Legs always variegated with yellow; at least part of the scape of 

 antennae and the tegulae invariably yellow; rest of body sometimes 

 entirely black, and sometimes with a considerable amount of yellow. 



Female. — Head : Frons slightly depressed ; insertion of antennae 

 slightly elevated; upper part of cylpeus somewhat convex; clypeus 

 bidentate or bilobed at apex, the lobes rounded; clypeus anr frons 

 except above antennae covered with a dense black to golden pubes- 

 cence, and also numerous black to brown upright hairs; antennae 

 slender, filiform, the segments having the following relative lengths — 

 1/19, 2/5, 3/27, 4/22, 5/17, 6/15, 7/13, 8/12, 9/10, 10/10, 11/9, 12/10; 

 scape mostly yellow, bulb often fuscous, remainder of antenna black, 

 very minutely sericeous ; mandibles very dark ferruginous to fuscous, 

 slightly hairy toward the base, with longitudinal raised lines and 

 furrows ; frons above antennae and vertex not or only slightly pubes- 

 cent, but with numerous erect black to brown hairs, sparsely punc- 

 tate; gena and occiput weakly punctate, and covered with coarse, 

 erect, black or brown hairs. 



Thorax: Surface of prothorax punctate, covered with long, erect, 

 black to golden hairs; dorsal surface sometimes with a yellow spot, 

 which may be interrupted in the middle. Mesonotum black, hairy, 

 densely punctate, and sometimes striate, lateral edges slightly re- 

 flexed from tegulae back; tegulae yellow; scutelluln often with a 

 yellow spot, longitudinally striate, hairy; pleural region just below 

 the wing insertion often yellow; rest of mesopleural region black; 

 whole mesopleural and mesosternal region hairy, punctate, sometimes 

 minutely striate. Metathorax black, except the metanotum, which 

 may have a median transverse yellow spot; up]f)er part of meta- 

 pleural region striate; the part just below ahnost entirely smooth 

 and without hairs; posterior portion of the metathorax somewhat 

 punctate and striate, not very definitely marked off above from the 

 propodeum. 



Propodeum : Black with often more or less yellow ; sometimes with 

 three spots of yellow — one at end of segment and one at each side just 

 anterior to the spiracle; sometimes with two at the end of the seg- 

 ment; sometimes with only one or none; hairy, punctate and finely 

 striate, the striations running obliquely up the sides and transversely 

 across the dorsum. 



Abdomen : Petiole smooth, nonpunctate or only very faintly 

 punctate, minutely sericeous; black, yellow, or black dorsally and 

 jellow ventrally; main portion of abdomen ovate, pointed at apex; 

 black, except usually the first dorsal segment, which may have an 

 irregular spot of yellow, or a smaller spot on each side, very rarely 

 an indistinct spot of yellow on each side of second dorsal segment; 



