150 ENTOMOLOGICAL NEWS. [April, '16 



cially on the frons, mesonotum and abdomen. The silver of 

 the face is not noticeable on my specimens of subsultans. 



This species has been known in the American collections as 

 Gymnopa nana Walk, and G. acnea Fall. It is not the latter but 

 may be the former. Walker's type cannot be located in the 

 British Museum by Mr. E. E. Austen to whom I submitted 

 specimens for comparison. 



Lytogaster willistoni n. sp. 



Black; third antennal joint except apex, knees, and tarsi except apices, 

 tawny ; halteres yellow with black knobs ; wings clear hyaline with 

 black veins. 



Subopake; abdomen shining; face gray with silvery orbits; pleurae 

 sparsely gray. Disc of frons, two median thoracic stripes, disc of scu- 

 tellum granulose ; abdomen minutely pitted becoming very dense on the 

 depressed dorsum of second segment. 



Abdomen very broad, convex and subglobose; lateral margins revo- 

 lute; second and more or less of third segment depressed on dorsum 

 with lateral lines of delimitation sharp ; fourth segment very large, 

 convex, two to three times as long as second and third together; fifth 

 triangular, nearly as long as fourth, with two shallow depressions near 

 apex. Length 2.3 mm. 



Type. — $ , Berkeley Hills, Alameda County, California, 

 April 20, 1908, (E. T. Cresson, Jr.), [A. N. S. P. No. 6104]. 



Paratypes. — 4 $ , 69 , topotypical. 



This species is found in most collections under the name 

 Ephydra or Pelina brevis Walker. As I do not know Walker's 

 species I cannot recognize the name. The species is distin- 

 guished by the large, shining, convex, subglobose abdomen, 

 with the fourth segment much developed. The surface of the 

 abdomen is minutely pitted as described. 



Parydra tibialis n. sp. 



Structurally similar to P. bituberculata Lw. 



Black ; halteres, knees, tibiae and tarsi tawny ; wings clear hyaline, 

 veins tawny, cross veins not clouded. 



Shining, more or less sparingly obscured by gray or brown pollen, 

 which on the face is dense and white, and on the abdomen and femora 

 is variegated with minute bare dots at the bass of setulae. Mesonotum 

 reddish coppery-tinged; abdomen greenish-tinged. Scutellum with two 

 small bristle-bearing tubercles, well separated as in bituberculata; lat- 

 eral bristles with or without minute tubercles. Length 4.5 mm. 



