344 CALIFORNIA ACADEMY OF SCIENCES [Pkoc. 4th Se». 



over the world. The female brings forth young in the pupal 

 stage and has an uterine sac which secretes a milk to feed 

 them. 



950. Ornithomyia anchineura Speis. 

 Upper Alsea Valley, Benton Co., on Steller's jay. 



951. Olfersia americana (Leach) 



On great horned owl at Corvallis (Thompson) 



952. Melophagus ovinus (Linn.) 

 The common sheep tick. 



