154 jTirst Annual deport 



Parathalassius melanderi n. sp. 

 (Figure 88) 



A small black fly, silvery gray pruinose, with all the bristles white. 

 The hypopygium is darker. The vertex is broad and concave, and 

 the face below the antennae narrow, broadening again at the gray cly- 

 peus. The antennae are dark brown, the first two joints small, the 

 terminal arista slender and about twice as long as the third joint 

 of the antennae. The lower half of eye covered with fine white 

 pubescence. A fringe of bristles around the eye as in P. aldrichi. 

 The proboscis is small and blackish. The abdomen has a transverse 

 basal row of black pits on each segment. The hypopygium is large 

 and globular, the top almost bare, and attached to the left side of 

 the body as in P. /il/lricln. The legs are slender and covered with 

 short white bristles, and with no apical spurs, as in P. aldrichi. Under 

 side of front and hind femora with heavy white bristles, the knees 

 and tarsi yellow. Halteres whitish. Three conspicuous black pits 

 along the lower edge of each abdominal tergite. There are six pairs 

 of long dorse-central bristles on the thorax, two scutellar bristles, 

 but no pleural or supra-alar bristles. Anal vein not much longer 

 than anal cross vein. The ends of the wings are broadly brownish. 

 Length 2 mm. 



Two specimens collected at Laguna, on the wet sand at the very 

 edge of the surf. 



PHORIDAE 



Trineura velutina Meig. 

 Occasional about decaying kelp. 



PIPUNCULIDAE 



Chalurus spurius Fall. 



SYRPHIDAE 



Nausigaster unimaculatus Twns. 

 Paragus tibialis Fall. 



Eristalis tenax L. 



The above four flies are frequent in the vegetation just back of 

 beach. 



CONOPIDAE 



Occemyia baroni Will. 



