2l8 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



of one generation are issuing, and that the larvae of August 

 are larvae from eggs laid by these adults. This would mean 

 a generation of flies appearing about July i, say, and a 

 second one appearing later, say about September 15." 

 This is, of course, mere conjecture. 



Ble^hai'ocerajordani. The larvae of Blepharocera jordani 

 have been found as early as February 23 (Los Gatos Creek, 

 California), and as late as June i (Stevens Creek, Cali- 

 fornia), and at various times in each of the three intervening 

 months. Pup£e were first found on April i (Los Gatos 

 Creek, California), and as late as June 4 (Smith's Creek, 

 California). These dates are derived simply from the data 

 of collected specimens and do not indicate a systematic 

 inspection of any single breeding place of the species. On 

 the occasion of the June captures, the larvse were few and 

 the pupae old; on June 4, at Smith's Creek, only pupae 

 («*. e., no larvae) were found. 



Bibioce^hala doanei. The larvae of this species were 

 taken as early as February 25 (Los Trancos Creek, 

 California), and as late as July 26 (Red Cap Creek, Hoopa 

 Indian Reservation, Humboldt County, California), and in 

 all the intervening months ; pupae are first recorded March 

 31 (Campbell Creek, California) and from then till July 26 

 (Red Cap Creek, Humboldt County, California) ; the only 

 free-flying imago was taken on July 15 (Congress Springs, 

 Campbell Creek, California). 



Bibiocephala comstocki. The writer's earliest recorded 

 date of taking the larv£e of this species is February 11 

 (Alembique Creek, California), the latest April 30 (Stevens 

 Creek, California) ; the earliest pupse are of the date 

 February 27 (Los Gatos Creek, California). A free-flying 

 imago was taken April 6 (Saratoga Springs, Campbell 

 Creek, California). 



Distribution. — The Blepharoceridae are too unfamiliar to 

 allow us to make many generalizations yet regarding their 

 distribution. What is known of the general distribution of 



