162 jrirst annual Report 



Psilopa atra Lw. 

 Psilopa mellipes Coq. 

 Both of these Psilopas were occasional about the lagoon. 



Ephydra gracilis Pack. 



Aldrich says of this : ' ' Described from Great Salt Lake, where it 

 is inconceivably abundant, even stopping trains. I did not find it 

 any where on my recent trip except at that lake, though the II. S. 

 Nat. Museum has it from Salton Sea and Yuma, Arizona. The opaca 

 of Jones is a synonym." 



Ephydra subopaca var. millbrae Jones 

 Occurs with the above. 



Lipochaeta slossonae Coq. 



(Figure 93) 

 Frequent on the beach at Laguna. 



OSCINIDAE 



Mosillus subsultans Fab. 



The aeneus of the Aldrich Catalog. Very common on the beach 

 and in the vicinity of the brackish water lagoon. 



GEOMYZIDAE 



Scyphella flava L. 



AGROMYZIDAE 



Rhicnoessa parvula Lw. 

 Milichiella nigrella n. sp. 



(Figure 94) 



A polished jet black fly, with black legs. Halteres white. Eyes 

 gray. Antennae very short, the third joint rounded and covered with 

 short fine gray hairs. The dorsal arista is bare and slender. The 

 last four joints of the metatarsi very short. Last segment of abdo- 

 men longest and with long lateral spines. One long supra-alar spine, 

 and many short reclinate spines on thorax and abdomen. Scutellum 

 small and rounded and with two long spines. Two pairs of vertical 

 bristles, and one quite long heavy spine on the second joint of the 

 antenna; two pairs of short fronto-orbital spines. The first vein 

 of the wing is very heavy and brown in color. A dark spot at the 

 tip of the costal cell; wings otherwise hyaline. Length 3 mm. ; length 

 of wing 2.75 mm. 



A number of specimens were taken on the beach at Laguna but 

 it is not common. 



