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



4. Third abdominal segment with a whitish or yellowish apical 



border 5 



Third abdominal segment without a whitish or yellowish 

 apical border 6 



5. Third and fourth abdominal segments with a yellowish 



apical border walshianus 



Third and fourth abdominal segments with a whitish apical 

 border albomarginatus 



6. Fourth and following abdominal segments without a whitish 



or yellowish apical border, the first and second abdominal 

 segments only bordered, and these with the border apical 



and yellowish; base of tibiae yellowish debilis 



Fourth abdominal segment, as well as the first and second, 

 with a yellowish apical border, the remaining segments 

 not bordered; tibiae more or less reddish cristatus 



7. Wings fuscO-violaceous 8 



Wings subhyaline or smoky; abdomen as well as antennae 



mostly black 9 



8. Postscutel black; apical margin of second dorsal abdominal 



segment smooth spinolas 



Postscutel yellowish; apical margin of second dorsal abdom- 

 inal segment rough unifasciatus 



9. Abdomen with four or five yellowish fasciae 10 



Abdomen with three yellowish fasciae; postscutel yellow... 



campestris 



10. Thorax quadrate ll 



Thorax oblong 13 



11. Ornaments yellowish 12 



Ornaments whitish waldeni 



12. Second dorsal abdominal segment with two yellowish spots 



birenimaculatus 

 Second dorsal abdominal segment without yellowish spots 



birenimaculatus var. 



13. Propodeum with a sharp border 14 



Propodeum rounded behind campestris 



14. Postscutel black or with inconspicuous marks 15 



Postscutel more or less yellowish 16 



15. Ornaments yellowish capra 



Ornaments whitish albophaleratus 



16. Body robust, black and shining catskilli 



Body slender, elongate tigris 



17. Thorax quadrate 18 



Thorax oblong 23 



18. Wings subhyaline or clouded or reddish 19 



Wings blackish or fuscous; ornaments whitish or luteous; 



propodeum maculated; second dorsal segment without a 

 luteous margin bidens 



