1913] Agromyza and Cerodontha. 291 



browned; first costal division half as long as second, veins 2-3-4 reg- 

 ularly divergent on last sections, outer cross vein at beyond end of first 

 vein, and at a little more than its own length from inner cross vein or 

 at its own length from it, second section of fourth vein distinctly shorter 

 than first; last section of fifth vein about twice as long as penultimate. 



Halteres lemon yellow. 



Length, 1-1.5 mm. 



Type: Cat. No. 15567, U. S. N. M. 



Type locality: Eureka, California, (H, S. Barber). Seven 

 specimens. I have seen one specimen in C. W. Johnson's 

 collection from Princeton, Maine, July 12, 1908. 



Food-plant unknown. 



17. Agromyza pruinosa Coquillett. 

 Syn: Agromyza pruinosa Coquillett, Jour. N. Y. Ent. Soc, Vol. X, 1902, p. 189. 



Male : Frons opaque, center stripe reddish, merging into brown on 

 margins and posteriorly, orbits not distinctly differentiated, and, with 

 outer margin of center stripe, blackish; breadth of frons one-half as 

 wide as head; five orbital bristles present, the lower four pairs incurved, 

 the upper one backwardly directed, no distinct orbital hairs present; 

 vertical row and postvertical pair strong; lunule not differentiated 

 from center stripe; face and cheeks reddish yellow, the former concave 

 in profile, keel distinct, and brownish; eye orbits carried back over 

 cheeks, blackish, cheeks and orbits at posterior angle of eye as high as 

 eye, marginal bristles on mouth opening 4-5 in number, strong, upwardly 

 directed, vibrissa hardly stronger, though distinct; proboscis and palpi 

 reddish yellow. Mesonotum grayish black, opaque, elongate, about 

 one-half longer than broad; four pairs of dorso-centrals present, about 

 three irregular rows of setulse between the dorso-centrals; the pair of 

 bristles between posterior pair of 'dorso-centrals distinct; pleura sub- 

 shining, black-brown, paler below wing base; squamee of moderate size, 

 whitish, fringe brown. Abdomen subshining, brownish; hypopygium 

 yellowish brown; of moderate size, all segments strongly haired. Legs 

 strong; reddish yellow, bases of femora, apices of tibiae broadly, and 

 entire tarsi brown; fore femora with distinct, rather long central 

 bristles; mid tibia without any distinct posterior bristles. Wings 

 slightly grayish; first costal division at least one-half as long as second, 

 subcostal vein rather indistinct, complete; inner cross vein at very 

 slightly before end of first vein, outer cross vein slightly outward bent 

 at middle, at almost its own length from inner, and at very little beyond 

 wing middle; veins 2-3-4 distinctly divergent on the outer section; 

 second and third sections of fourth vein together half as long as last 

 section; last two sections of fifth vein subequal. Halteres whitish yellow. 



Length, 2.5 mm. 



Redescribed from type (Cat. No. 6659, U. S. N. M.). 

 Locality: Colorado, (H. K. Morrison). 

 Food-plant unknown. 



