152 jfir0t Annual mepott 



wliich pass part way down the face. Four basal joints of the anten- 

 nas with long dark bristle-like hairs. Last joint of antennae slender 

 and twice as long as any other joint. Two longitudinal narrow yel- 

 low stripes on the thorax do not quite reach the scutellnm. Halteres 

 lemon yellow. This fly is much darker than E. bellus or E. ornatus. 

 Thorax above the wing with a small yellow patch, and a round yellow 

 patch on the lower corner of each abdominal segment as seen from 

 above. Last segment with base only black, the remainder yellow. 

 Ventrally the first segment of the abdomen is black, the rest sordid 

 yellow. Thorax black ventrally ; there is a lateral narrow yellow 

 stripe running from the base of the wing, the length of the thorax. 

 Occiput convex and black. Mouth parts yellow. Most of the sub- 

 costal, and the end of the costal cell, is brown, the rest of the wing 

 hyaline. Length 5.5 mm.; length of wing 5 mm. 



A single specimen collected by Prof. Baker at Laguna Beach. 



BOMBYLIDAE 

 Toxophora pellucida Coq. 

 Several specimens. 



THEREVIDAE 



Psilocephala costalis Lw. 



Psilocephala laevigata Lw. 



Psilocephala marcida Coq. 



The above three flies were taken in vegetation just back from the 

 beach. 



ASILIDAE 



Mallophora fautrix O. S. 

 Not uncommon. This species was described from Mexico. 



Stichopogon trifasciatus Say. 



(Figure 87) 



This Asilid is widely distributed in the United States. At Laguna 

 it was common on the beach sand. It is a silver gray fly, with black 

 markings, and its colors blend with the sand perfectly. This pro- 

 tective coloration makes it very hard to locate when at rest. In 

 habits it is a typical robber-fly. Determined by Prof. Hine. 



EMPIDIDAE 

 Drapetis nitida Melander 



This fly was very common on the beach sand. It is quite small 

 and jet black, and runs rapidly here and there over the sand, seldom 

 flying to any distance. It is also found on the edge of the lagoon 

 and is very quick and hard to catch. 



