232 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Sek. 



parts are a series of sharp lancets (four in the male, 

 six in the female), enclosed in a lip-like organ. They are 

 remarkable fliers and are fond of warm weather and sun- 

 shine. The males do not bite; feed on plant nectar or honey- 

 dew secreted by plant lice or scale insects. 



The larvae are found in rotting logs, under stones in 

 ditches, or in mud along streams or other bodies of water. 

 They are predacious and feed on various little animals. 



173. Pangonia dives Will. 

 Hood River, VII-26 (Childs). 



174. Pangonia fera Will. 



Described from Mt. Hood. Horse Lake, VII-25 ; Mt. 

 Jefferson, VII-27 (Bridwell). 



175. Chrysops coloradensis Bigot 

 Rickreall, VII-23 (Allen). Hine det. 



176. Chrysops discalis Will. 

 Warm Springs, VII-7. 



177. Chrysops excitans Walk. 



Mt. Jefferson, VII-12 (Bridwell); Horse Mt. Flats, 

 VII-30. Cole det. 



178. Chrysops lupus Whitney 



Pamelia Lake, VII-27 (Bridwell); Corvallis, IX-26; 

 Grant Co., VII-14. 



179. Chrysops noctifer O. S. 



Parkdale, VI-18 and Dee, VI-17 (Cole); Mt. Jefferson, 

 VII-12 (Bridwell) ; Whitman Nat. Forest, VII-14 (Cham- 

 berlin). 



180. Chrysops pachycera Will. 

 Buck Mt., VII-19. Cole det. 



