460 PROCEEDINGS OF THE ACADEMY OF [1899. 



6. Abdomen with petiole alone maculated with yellow ... 7 

 More than one segment maculated with yellow .... 8 



7. Petiole distinctly punctured, remainder of abdomen impimc- 



tate ; petiole with a U-shaped yellow mark near base 



Abdomen entirely smooth ; petiole with a reddish spot near 

 base keviventris 7d'. 



8. Second dorsal segment apically with a broad yellow l)aud 



covering one-third or nearly half the segment ... 9 

 Fascia of abdomen narrow 10 



9. Viewed laterally the second segment is evenly convex above 



and beneath ; wings darkened along costa and in marginal cell 



convexa d'. 

 Viewed laterally the second segment is elongate, subangulate 

 above and beneath between base and middle 



sujieyjicicdis 9 d'. 



10. Thorax more or less variegated with rufous; form stout . 11 

 Thorax not rufous, maculated with yellow; sides of petiole 



usually yellow usitata ? d. 



11. Clypeus longer than broad, maculated distinctly in both 



sexes ; greater part of thorax sufiused with rufous ; vertex 

 with distinct though not strong punctures . mffusa ? d. 

 Clypeus almost as long as broad, maculated in d only; rufous 

 on pronotum only, though sometimes marking either or both 

 scutella; vertex strongly puuctured . . . compada '^d. 



12. Viewed from side the second segment is evenly convex above 



and beneath 13 



Viewed from side the second segment is either angulate. sub- 

 angulate, or tuberculate on either or both the upper or 

 under surfaces toward base 21 



13. Yellow and black, the greater part of thorax and petiole 



yellow tinged with brown or reddish; legs yellow and light 



brown colorata 9d. 



Black; at the most maculated with yellow, or suffused with 

 rufous; legs dark basal ly 14 



14. Pronotum, scutella, two stripes on middle- segment (and peti- 



ole apically in d ) rufous, and maculated with yellow as well 



tinctura 9d. 

 Without rufous 15 



