128 



aa. Cremaster never with hooked setae. 



b. Cremaster a stout T-shaped spine Group C. 



bb. Cremaster always bifurcate Group D. 



Group A 



This group includes species in which the cremastral setae are of 

 two sizes, and which generally show the epicranial suture, and a dor- 

 sal furrow between the ninth and tenth abdominal segments (Fig. 

 109). Spiracular furrows are also frequently present. The genera 

 included in this group may be separated as follows : 



a. Epicranial suture always present ; prothoracic femora always ex- 

 posed, usually a large portion ; spiracular furrows never present ; 

 dorsum of abdomen with a distinct furrow between segments 9 and 

 10, and also on the lateral surface of segment 10. 



b. Dorsum of fifth abdominal segment with a distinct furrow on the 

 cephalic margin ; caudal margin of the furrow between the ninth 

 and tenth abdominal segments with finely serrate edges and with- 

 out setae Hydria Hiibner. 



bb. Dorsum of fifth abdominal segment never with a distinct furrow 



on the cephalic margin ; caudal margin of the furrow between 



the ninth and tenth abdominal segments coarsely serrate. 



c. Prothoracic and mesothoracic legs extending cephalad between 



the sculptured eye-piece and the antenna, the mesothoracic leg 



extending almost as far cephalad as the prothoracic ; caudal 



margin of the furrow between the ninth and tenth abdominal 



segments without setae ; cremaster distinctly constricted at the 



proximal end and circular in outline Eois Hiibner. 



cc. Prothoracic leg extending cephalad between the sculptured eye- 

 pieces and the antenna, the mesothoracic leg never reaching 

 farther cephalad than the caudal margin of the eye-piece ; cau- 

 dal margin of the furrow between the ninth and tenth ab- 

 dominal segments usually fringed with fine setae ; cremaster 

 not constricted at the proximal end, triangular in outline, 

 d. Cremaster with hooked setae of nearly the same size, the me- 

 dian caudal setae being only slightly larger than the others; 

 three setae inserted along each side of the cremaster, the other 

 two cephalad of these and slightly mesad. 



Tepliroclystis Hiibner. 

 dd. Cremaster with the hooked setae of widely differing sizes, the 

 two median caudal setae being much larger and longer than 

 the others, a smaller seta adjacent on each side, while the 

 other setae are arranged in a tranverse row just cephalad 

 of the caudal setae Cinglis Guenee. 



