238 CALIFORNIA ACADEMY OF SCIENCES [P«OC. 4th Sul 



Family CYRTID^ 



Fig. 16. Pterodontia misella O. S. 



These curious little flies are usually very rare. The thorax 

 and abdomen are large and inflated in appearance, and the 

 head, which is composed almost entirely of the compound 

 eyes, is quite small. All the species in North America have 

 three pulvilli and enormous squama?. Great variations occur 

 within the family, especially in the wing venation and struc- 

 ture of the mouth parts. The larvae are parasitic in the 

 bodies or egg cases of spiders as far as known and appar- 

 ently this parasitic mode of life has modified the structure 

 of the flies. 



225. Pterodontia misella O. S. 

 Described from Oregon. One specimen from Forest 

 Grove, VI-5-1918 (M. C. Lane); a single female from 

 Mary's Peak, V- 15 (Moznette). 



226. Eulonchus sapphirinus O. S. 

 A large series taken at Parkdale, VII- 12 (Cole and 

 Childs) ; Forest Grove, VI-3 and 5 (Cole) ; Mt. Jefferson, 

 VIII-15 (Bridwell); Corvallis, V-20; Mary's Peak, VI-6 

 (Lovett); Buck Mt., VII-10. 



