474 AMERICAN HYMENOPTERA. 



interalar band ; pleura yellow to, or nearly to, the bases of the legs, or 

 with their entire lower half dark ; dorsum of abdomen usually with yel- 

 low on the sides of the first segment and on the sides of the apical mar- 

 gin of the third, but sometimes entirely dark except for the yellow on the 

 fourth segment and the light ferruginous pubescence on the apical portion 

 of the apical one. 



Female. Head. — Face sometimes with a slight yellow touch above 

 the bases of the antennae, but usually entirely dark ; occiput with a 

 large triangular patch of yellow pile ; cheeks dark. Malar space 

 nearly as long as its width at the apex, about one-fourth as long as 

 the eye. Clypeus with its front part, especially in the middle, some- 

 what sparsely punctate, its base and sides being more or less densely 

 punctate. Flagellum of antenna nearly twice as long as the scape ; the 

 third antennal segment longer than the fifth and the fifth longer than 

 the fourth. 



Thorax. — Dorsum, except the small bare spot on the very center of 

 the disc, sometimes clothed entirely with yellow pile, sometimes with 

 a black spot on the disc and sometimes with a distinct, though poorly 

 defined, black band between the bases of the wings; mesopleura usu- 

 ally covered with yellow pile to, or nearly to, the bases of the legs, 

 but sometimes with their entire lower half dark ; metapleura with con- 

 siderable yellow pile or entirely dark ; sides of the median segment 

 dark, sometimes with a few light hairs admixed ; extreme sides of the 

 metanotum sometimes entirely dark, but generally with considerable 

 yellow pile. 



Abdomen. — Dorsum : segment one dark in the middle and usually 

 with more or less yellow pile on the sides, but sometimes entirely dark ; 

 segment two dark ; segment three dark, but usually with considerable 

 yellow pile on the sides of its apical border ; segment four, except 

 some black pile on its very middle portion, covered with yellow pile ; 

 segment five dark, but often with considerable ferruginous hair on the 

 sides ; segment six strongly pointed at its apex and usually bearing light 

 brownish-ferruginous pubescence over a considerable portion of its 

 surface, this pubescence being very thick and matted about the very 

 apex. Venter dark, sometimes with a few scattering yellowish or ferru- 

 ginous hairs. Hypopygium very pointed at apex, its lateral carinas 

 rather strongly elevated and coming together posteriorly somewhat in 

 front of the apex of the segment ; the apical portion bearing a con- 

 siderable amount of yellowish-ferruginous pubescence, and the very tip 

 usually extending distinctly beyond the tip of the last dorsal segment. 



Wings. — Considerably stained with brown, the fore pair usually 

 darkest in the region beyond the veins. 



Legs. — Mostly dark ; the hind metatarsi fully three times as long as 

 their greatest breadth, their hind margins slightly arcuate. 



Dimensions . — Length, 12 mm. to 16 mm. Spread of wings, 29 mm. 

 to 38 mm. Width of abdomen at second segment, 6^ mm. to 9 mm. 



