86 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



lum, rarely with a small spot on mesopleurae, front legs, 

 middle legs beyond coxae, posterior trochanters, basal half 

 of femora, tibise and tarsi, basal plates, venter of five 

 basal abdominal segments, tergum of fourth and a band 

 at middle and sides of first and third, sometimes narrowed 

 to a line at middle, yellow; costa yellow, stigma pale at 

 base; male differs in having pleurae, pectus, all the coxae, 

 and abdomen beyond first segment, yellow or rufous; 

 posterior and middle femora with a black line above, basal 

 plates and first abdominal segment black; some specimens 

 wholly yellow or rufous, except antennae beyond second 

 segment, spot on vertex, three spots on mesonotum, and 

 base of abdomen, which are black. Length 11-13 mm. verticalis 



17. Abdomen rufous beyond basal plates; body black, with two 



basal segments of antennae, posterior orbits, tegulae, scutel- 

 lum, front and middle legs beyond coxae except the tarsi, the 

 posterior femora at base and the tibiae, and the abdomen 

 beyond the basal plates, rufous; clypeus, labrum, cheeks, 

 collar, a spot above posterior coxae, and tarsi, white. Length 



12 mm ruficolor 



Abdomen black at base and apex, rufous at middle; body 

 black, with clypeus, labrum, mandibles., cheeks, collar, 

 tegulae, spot above posterior coxae, legs except apical half 

 of posterior femora and ring at apex of tibiae, and the basal ' 

 plates, yellow; two basal segments of antennae and abdom- 

 inal segment four and a part of three and five, yellowish 

 rufous ; wings hyaline. Length 12 mm bifasciata 



18. Abdonien wholly or in part rufous (See sec. 15) signata 



Abdomen wholly black 19 



19. Pectus black (See sec, 48) rufipes 



Pectus rufous (See sec. 48) rufopecta 



20. Head above antennae more or less yellow 21 



Head above antennae wholly black 30 



21. Abdomen wholly or in part pale 22 



Abdomen wholly black 29 



22. Scutellum wholly or in part yellow 23 



Scutellum wholly black 26 



23. Pleurae and pectus black (See sec. 16) verticalis 



Pleurae and pectus pale 24 



24. Abdomen wholly pale beyond the basal plates 25 



Abdomen with first three abdominal segments black; body 



black, with clypeus, labrum, mandibles, cheeks, face 

 around and beneath antennae, inner orbits, a line near occi- 

 put, tegulae, collar, spot on sides of scutellum, spot on 

 pleurae, coxae, trochanters, front legs in great part, middle 

 femora, basal third of posterior femora, venter of abdo- 



