50 



inal segments, which extend around to the ventral surface. These 

 rows of spines are always present on segments 3-6, the number vary- 

 ing on segments 2 and 7, while there is always one row on segments 

 8-10. The number of rows of spines on segment 7 differs in the 

 sexes, there being two rows in the male and only one in the female. 

 The spines on the tenth segment are very broad, and this row extends 

 nearly to the ventro-meson. Each of the spines has a seta inserted 

 near its tip, which is not heavily chitinized and therefore easily broken. 

 There are never any setae present on the anal rise. The genera of 

 Aegeriidae may be separated as follows : 



a. Maxillae always more than half the length of the wings, generally 

 nearly or quite equaling their length; coxae of mesothoracic legs 

 never adjacent on the meson below the maxillae. 

 1). Clypeus with a prominent elevation near its caudal margin, bearing 

 a heavily chitinized transverse ridge or series of projections which 

 are probably to assist the pupa in cutting its way out of the 

 burrow. 

 c. Clypeus with the chitinized transverse ridge produced into a dis- 

 tinct point on each side of the meson. 

 d. Mesothorax with the median carinate ridge extending nearly 

 its whole length, very distinct on the metathorax ; second ab- 

 dominal segment with the two rows of spines distinct in both 

 sexes ; maxillae never reaching the caudal margin of the wings 

 and ending opposite to the antennae ; pupae averaging 20-25 



mm. in length Sanninoidea Beutenmiiller. 



dd. Mesothorax with the median carinate ridge usually extending 

 only along the cephalic half, never distinct on the meta- 

 thorax ; second abdominal segment never with two distinct 

 rows of spines in either sex; maxillae reaching the caudal 

 margin of the wings and ending opposite the mesothoracic 

 legs; pupa usually 8-15 mm. in length. 



Synanthedo7i Hiibner. 

 cc. Clypeus with a transverse row of separate projections. 



Parliarmonia Beutenmiiller. 

 bb. Clypeus not prominently elevated at its caudal margin and never 

 bearing ridges or projections which could be used in cutting, 

 c. Tenth abdominal segment with eight spines in a row ; caudal end 

 of body just cephalad of the anal opening without setae. 



Podosesia Moschler. 



cc. Tenth abdominal segment with ten large spines in a row and two 



smaller ones, one on each side of the meson ; caudal end of body 



just cephalad of the anal opening with a row of four setae 



which are inserted under small projections. 



Memytlirus Newman, 

 aa. Maxillae about two fifths the length of the wings; coxae of meso- 

 thoracic legs and their tarsi adjacent on the meson caudad of the 

 maxillae Bembecia Hiibner. 



