-37- 



5. Aedeagus divided into two 

 processes apically; one a 

 ribbon like process arising 

 near the middle and ta- 

 pering to an acute apex. 

 Ribbonlike part encircles 

 the central part for at 



least one revolution. -6 



- Aedeagus without a ribbon- 

 like encircling structure 



as above. -7 



6. 8th tergite apex with 

 dorso-lateral processes 

 curved dorsally and mesally 

 at tip. Below aedeagus 

 (ventral aspect) a large 

 triangular plate. No ven- 

 tral process on seventh 



sternite. fig. 157 ulmeri Mosley 1937 



- 8th tergite divided into 

 lateral lobes, the lower 

 margins of each produced 

 into long, smooth, tapering 

 processes. Left one curved 

 dorsad, right one ventrad. 

 Ventral process on 7th 



sternite. fig- 158 arizona Ross 1948 



7. 8th segment with a lateral 

 process, bearing long seta 



or emarginate on apex. -8 



- 8th segment without such a 



lateral process. -9 



8. 8th segment with a long 

 process on apico-lateral 

 margin, this produced into 

 a narrow apex and bearing a 

 very long seta; seta direc- 

 ted dorsad and longer fig* 159 michiganensis Mosley 

 than process. 1934 



8th segment, ventral por- 

 tion scoop shaped; dorsal 

 part a heavily sclerotized 

 hump; from hump sclerotized 

 lateral arms, base of each 

 being within 8th tergite, 

 progressing posteriorly and 

 curving dorsad, apex ex- 

 cised to form a pair of 

 sharp points. fig* 160 glasa Ross 1941 



