162 Fitst Annual Report 
Psilopa atra Lw. 
Psilopa mellipes Coq. 
Both of these Psilopas were occasional about the lagoon. 
Ephydra gracilis Pack. 
Aldrich says of this: ‘‘Deseribed 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 U. 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. Antenne 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. 
