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



8. Antennal area without an impunctate area; body black, with 

 . clypeus, labrum, collar broadly, tegulae, scutellum, post- 



scutellum, round spot on mesopleurae, front and middle 

 legs except apical third of femora and extreme base and 

 apex of tibiae, basal plates, and last abdominal segment, 

 yellow; stigma and veins brownish; mesopleurae above the 

 yellow spot much more densely punctate than below. 



Length 10 mm alba 



Antennal area with a small impunctate area 9 



9. Mesopleurae with upper half more coarsely and densely punc- 



tate than lower half; basal plates yellow; body black, with 

 clypeus, labrum, collar, tegulae, scutellum, an oblique band 

 on pleurae frequently interrupted, apices of front coxae, 

 front femora beneath, front tibiae beneath and at base, front 

 tarsal segments except at apex, middle coxae in great part, 

 middle trochanters, middle femora on basal half, middle 

 tibiae and tarsi except a ring at apex, hind coxae and 

 hind trochanters, basal third of hind femora, hind tibiae 

 except a ring at base and the apical fourth, a ring on mid- 

 dle of hind metatarsi, basal plates, and last abdominal seg- 

 ment, yellowish; wings smoky, veins and stigma brownish. 



Length 10 mm pulchella 



Mesopleurae with upper half slightly more coarsely but no 

 more densely punctate than lower half; basal plates wholly 

 black; body black, with clypeus, labrum, mandibles at base s 

 collar, tegulae, scutellum, an oblique band on the mesopleurae 

 frequently interrupted, front and middle legs except tips of 

 femora and tibiae above and apices of tarsal segments, hind legs 

 (except apical half of femora, a ring at base of tibiae, apical 

 fifth of tibiae, and apices of tarsal segments), and an 

 oblique band on apex of metapleurae, yellow or white; 

 wings hyaline. Length 8-9 mm confusa 



10. Abdomen wholfy black 11 



Abdomen more or less pale; body black, with front and mid- 

 dle tibiae beneath and three basal segments of abdomen, 

 piceous; wings infuscated, veins black, stigma piceous. 

 Length 12 mm , . dejecta 



11. Posterior tibiae in part pale 12 



Posterior tibiae wholly black 21 



12. Posterior tibiae banded with pale at middle 13 



Posterior tibiae with an outer pale line or spot, sometimes in- 

 distinct 19 



13. Mesopleurae with a white or yellow spot 14 



Mesopleurae wholly black 15 



14. Mesopleurae more densely punctate on upper half than on 



lower half; body black, with clypeus, labrum, mandibles 



