364 PROCEEDINGS OF THE ACADEMY OF [1895. 



7. Anterior wings reaching beyond the third abdominal segment . 8 

 Anterior wings not reaching beyond the third abdominal segment 



9 



8. Thorax on sides and beneath almost entirely yellow, the greater 



part of abdomen of that color; median and hind tarsi as usual; 

 thorax not much narrowed posteriorly. Length 18 mm. 



temiieornis. 



Thorax on sides and beneath more or less black; the segments of 

 abdomen about equally yellow and black; median and hind 

 tarsi somewhat flattened, the last joint larger than usual; 

 thorax distinctly narrowed posteriorly. Length 11-12 mm. 



pulla. 



9. Length 12-15 mm.; mesosternum in greater part black; front and 



vertex clothed with long, pale grayish hair; punctuation of 

 dorsulum very dense, almost granular; fasciae of abdomen 



deeply emarginate anteriorly pictifrons. 



Length 9 mm.; mesosternum almost entirely yellow; front and 

 vertex with sparse, rather short, pale hair; punctuation of dor- 

 sulum distinct; fasciae of abdomen, the first excepted, scarcely 

 emarginate exigua. 



10. No yellow on dorsulum medially or on middle segment; first 



dorsal abdominal segment with a lateral spot, the fasciae on the 

 following segments interrupted medially; wings fusco-hyaline. 



serrata. 



Dorsulum medially and middle segment above spotted; all the 

 dorsal abdominal segments (except the last in one species) with 

 a continuous fascia; wings hyaline 11 



11. Clypeus entirely and a large spot on mesopleurse as well as greater 



part of femora, the tibiae and tarsi entirely and a fascia on all 

 the ventral segments and apex of last dorsal, yellow. 



pulchella. 



Clypeus basally, mesopleurae, femora, except apically, tibiae with- 

 in, black; tarsi dark testaceous; at the most the second ventral 

 with a small lateral spot; last dorsal entirely black . . usitata. 



Males. 



Seventh dorsal segment with a distinct lateral spine; eighth ven- 

 tral terminating in one spine 2 



Seventh dorsal segment not spinose; eighth ventral with three 



spines 3 



2. Lateral spine of seventh dorsal segment acuminate at tip; thorax 

 maculated; maculation of first dorsal segment in form of CD 

 that on the following segments not broken into spots . signata. 



Lateral spine of seventh dorsal segment truucate or obtuse at apex ; 

 maculation of first dorsal segment consisting of two large spots, 

 that on third segment of four spots Carolina. 



