38 THE CANADIAN ENTOMOLOGIST. 



Dorsum of ihorax banded with black. 



A. Thorax before the band white appositus. 



AA. Thorax before the band yellow, scutellum yellow. 

 B. Apex of abdomen black. 



First segment and second (except basal middle) 



yellow affinis. 



First, second partly, and fourth segments yellow, rest 



black Edwardsii. 



First and second segments yeliov scutellaris, 9 . 



First four segments yellow fervidus, 9 . 



First four segments lemon-yellow sonorus, 9 • 



First, second, fourth and fifth (partly) yellow. 



Venter nearly bare Putnamii, 9 • 



Venter and legs with long yellowish hairs. . Putuamii, £ . 



BB. Apex white. 



First two segments black, third fulvous, fourth to sixth 



segments white Co/oradensis, 9 , var. nov. 



First two and fourth segments black proximus. 



First, second partly, and fourth segments black . . Howardii. 



BBB. Abdomen, except apex, ochreous or yellow. 



Apex tufted with black, wings uniformly 



fuscous fervidus, <*, . 



Apex fulvous or fulvous-yellow, wings subhyaline basally, 



broadly fuscous at apical third Pennsylv aniens, £ . 



AAA. Thorax before the band yellow, scutellum more or less black. 



First segment black, vertex with two yellow patches. terricola, 9 . 

 First segment partly yellow, vertex all black.. Pennsy/vanicus, ¥ • 

 " All the dorsal segments clothed with a fulvous 



pubescence " Titusi, n. sp., Ashmead. 



II. — -Abdomen with a more or less distinct orange-red band. 



Dorsum of thorax more or less distinctly banded with black. 

 A. Apex of abdomen black or nearly so. 



B. First and fourth segments, second at least partly, and third seg- 

 ment entirely, orange-red. 

 C. Scutellum all yellow. 



Second segment all orange-red, face yellow ternarius. 



