Dec., '06] ENTOMOLOGICAL NEWS. 375 



attached to the left side of the body and bent forward and to the right, 

 thereby crowding the small fifth, sixth and seventh segments to the left 

 of the median line. 



Legs slender, white bristly, middle tibiae with small white apical 

 spurs, the joints of the middle tarsi with small black apical spurs, under 

 side of front femora and sides of hind femora ciliate with longer white 

 bristles ; pulvilli broad, empodium hair-like. 



Halteres white. Wings whitish, veins strong, blackish, less dark 

 basally, base of costa with a few white bristles, third longitudinal vein 

 simple, four posterior cells, anal cross vein perpendicular to the anal 

 vein. 



Female. Differs from the male as follows : Facets of eyes uniform, 

 nowhere concealed by pubescence. Abdomen with five dorsal flattened 

 segments, its apetf jet black. 



Over two dozen specimens of this species were saved by its 

 collector. The type locality is the dry sands in back of the 

 beach at Monterey, California. It gives me much pleasure to 

 be able to dedicate this species to my dear friend and neighbor, 

 Professor J. M. Aldrich, who discovered this interesting fly, 

 and to whom we are indebted for a large proportion of what 

 we know of the species of this family. 



Parathalassius candidatus sp. nov. 



After the description of Parathalassius was sent to the 

 ENTOMOLOGICAL NEWS, Professor Aldrich discovered among 

 his collections another specimen of the genus, but which, on 

 account of its larger size and more bristly appearance, is dis- 

 tinct from the Californian form. This individual, a female, 

 was collected at Friday Harbor, San Juan Co., Washington, 

 during the summer of 1905. Professor Aldrich is its dis- 

 coverer also. 



Female. Length 3 mm., length of wing 3.25 mm. This species 

 differs from the preceding only as follows: Face slightly broader; hairs 

 of occiput more dense. Dorsum of thorax with two narrow black vittae, 

 each of which is bounded by rows of bristles, so that there are four 

 rows of dorsocentrals, with about fourteen bristles to each row. 

 I'ictween the acrostichal bristles and the humcri is a close aggregation 

 of short bristles, which are represented in P. aldriclii by a few bristles 

 only. Scutellum with six marginal bristles. The three black pits along 

 the lower edge of each abdominal tergite are large and conspicuous. 

 Ovipositor large, trough-like, exserted backwards from under the last 

 segment. Bristles of legs stronger, not recumbent but projecting; spurs 



