334 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th See. 



twice and the anal cell wanting. There are no oral vibrissas. 

 Most of the species are quite small and are found at the 

 edges of streams or lakes, often in immense numbers. 



The larvae of some species are found in alkaline lakes and 

 ponds, others in sap and in the stems of aquatic plants. 



877. Notiphila decoris Will. 

 Hood River, VI-19 to X-26 and Forest Grove, VII-16 

 (Cole). 



878. Psilopa comta Meig. 



Baker City, VIII-2 (Creel) ; Hood River, VI-19 to IX-5 

 and Forest Grove, IV (Cole). 



879. Ilythea spilota Curtis 

 Hood River, X-26 (Cole). 



880. Discocerina aliena Cress. 

 Forest Grove, V-7 (Cole). Cresson det. 



881. Hydrellia hypoleuca Loew 

 Narrows, VIII-1; Hood River, X-26 (Cole). 



882. Hydrellia scapularis Loew 



Forest Grove, VI-3 and Hood River, X-26 (Cole) ; Cor- 

 vallis, V-2 (Lovett). Cresson det. 



883. Octhera mantis (DeG.) 

 Corvallis, V-2 (Lovett); Corvallis, IX-12 (Cole). 



884. Pelina truncatula Loew 



Hood River, VII-10 ro IX-29 (Cole). Cresson det. 



885. Pelomyia occidentalis Will. 

 Hood River, X-26 (Cole). 



886. Parydra appendiculata Loew 

 Hood River, VI-5 to X-26 (Cole) . Common. 



887. Parydra bituberculata Loew 

 Forest Grove, V-25" (Cole). 



