130 



Group C 



The species of this group are distinguished by the peculiar T- 

 shaped cremaster. The genera may be separated as follows : 



a. Epicranial suture present; prothoracic and mesothoracic legs meeting 



on the meson caudad of the maxillae Alsopliila Hiibner. 



aa. Epicranial suture never present; prothoracic and mesothoracic legs 

 never meeting on the meson caudad of the maxillae. 



Breplios Ochsenheimer. 



Group D 



This group is characterized by the presence of a bifurcate cre- 

 master. The epicranial suture is never present, but a portion of the 

 prothoracic femora is exposed in many genera. The following table 

 will serve to separate the genera of this group : 



a. Prothoracic femora visible. 



b. Cephalic margin of the fifth abdominal segment with one deep 



spiracular furrow with strongly chitinized edges, just cephalad 



of each spiracle. 



c. Mesothoracic spiracle with a broad, very strongly elevated ridge or 



oval tubercle adjacent to its caudal margin Avhich is covered with 



fine short setae; surface of spiracular furrow with distinct 



punctures Pliysostegania Warren. 



cc. Mesothoracic spiracle with only a very narrow, slightly elevated 

 ridge adjacent to its caudal margin, usually covered with setae ; 

 surface of spiracular furrow without distinct punctures, 

 d. Dorsal surface of abdomen never with a distinct furrow be- 

 tween the ninth and tenth segments, its caudal margin finely 

 serrate; surface of the spiracular furrow almost smooth. 



Ectropis Hiibner. 

 d. Dorsal surface of abdomen never with a distinct furrow between 

 the ninth and tenth segments ; surface of the spiracular fur- 

 rows strongly rugose Cleora Curtis. 



bb. Fifth abdominal segment without any deep spiracular furrow; 

 cephalic margin of the segment deeply punctate, the punctures 

 sometimes confluent; mesothoracic spiracle with a broad 

 strongly elevated ridge or tubercle adjacent to its caudal mar- 

 gin; dorsal surface of abdomen without a distinct furrow be- 

 tween the ninth and tenth segments. . . .Cymatopliora Hiibner. 

 aa. Prothoracic femora never visible; deep spiracular furrows always 

 present on the cephalic margin of the fifth abdominal segment; 

 mesothoracic spiracle always with a prominent elevation adjacent 

 to its caudal margin, 

 b. Dorsal surface of abdomen never with a furrow between the ninth 

 and tenth segments ; abdominal spiracles very strongly produced ; 



