62 



THE UNIVERSITY SCIENCE BULLETIN. 



External genitalia: Female, last ventral segment a little less than 

 three times as long as broad, posterior margin slightly sinuate and with 

 a faint median notch; pygofers broad, barely exceeded by tip of oviposi- 

 tor. Male, valve about five times as wide as long, the posterior, and 

 lateral margins forming a regular curve ; plates not as broad proportion- 

 ately as in uhleri, tapering to somewhat truncate tips; pygofers enclosing 

 base of plates and slightly exceeding them, meeting in a median ridge. 



Male internal genitalia: Styles with broad basal club-shaped portion 

 much as in two preceding species, but terminal half sinuate and terminal 

 fourth broadly rounded and serrate medially, with caudo-lateral corner 

 drawn out into strong point much as in sanguinolenta. 



Distribution: So far this species has been taken only in the 

 southeastern corner of the state, as shown by the following 

 map: 



Hosts: The definite host is unknown, our specimens being 

 taken when sweeping in pastures. 



Genus IDIOCERUS Lewis. 



This genus contains rather large wedge-shaped insects which 

 taper gradually from the wide head backward. The vertex is 

 short, the margins parallel. The male antennas frequently end 

 in flattened discs. The elytra are long and narrow, usually 

 exceeding the abdomen, and have a very large appendix. All 

 of our forms live in trees, chiefly willow, cottonwood, and 

 Cratsegus. 



Eight species of this genus have been taken in the state, but 

 four other species likely occur in our fauna and are therefore 

 included in the key. 



