308 Annals Entomological Society of America [Vol. VI, 



times its own length from inner and at wing middle; last section of 

 fifth vein about two-thirds as long as penultimate section; veins 3-4 

 gradually and slightly divergent. Halteres yellow. 

 Length 1.5-2 mm. 



Type: Cat. No. 15574, U. S. N. M. 



Locality: Placer County, California, November, mining 

 leaves of strawberry, (A Koebele). 

 Three specimens. 



33 Agromyza posticata Meigen. 

 Plate XXXI, Fig. 29. 

 Syn: Agromyza posticata Meigen, Syst. Beschr., Vol. VI, 1830, p. 172, 

 species 16. 

 Agromyza terminalis Coquillett, Proc. Acad. Nat. Sci. Phil. 1895, p. 318. 

 Agromyza taeniola Coquillett, Proc. Ent. Soc. Wash., Vol. VI, 1904, p. 191. 



Male and Female: Frons black, >3enter stripe opaque, orbits 

 shining, breadth of frons less than one-third the head width; four 

 orbital bristles below anterior ocellus, small hairs on orbits microscopic 

 in male, strongest in female; lunule silvery white poUinose; antennae 

 brown, of normal size; dorsal bristle on second joint distinct, apex 

 of same joint with ntmierous short hairs, which are most distinct on 

 the under side; third joint rounded, covered with short, pale pilosity; 

 arista brown, pale yellowish on basal elongate swelling, very thickly 

 covered with short pubescence, which is not longer than the basal 

 diameter of arista; arista as long as from its base to beyond upper 

 orbital bristle; eyes microscopically haired, cheeks and face bro-wTi; 

 the latter concave in profile, keel slight; cheeks linear at anterior mar- 

 gin, at posterior margin very slightly broadened, marginal bristles, 

 5-7, of moderate strength; vibrissa strong; proboscis yellow; palpi 

 brownish yellow, normal in size, with weak end bristles'. Mesonotum 

 glossy brownish-black, margins and humeri pale brown, with an in- 

 dication of yellow along suture between margin of disk and pleuras; 

 three distinct pairs of dorso-centrals present, in one specimen an ad- 

 ditional bristle is visible on one side anterior to the front pair; 5-6 

 irregular rows of setulee between dorso-centrals, the pair of bristles 

 between posterior dorso-centrals distinctly differentiated from setulse 

 but much weaker than dorso-centrals; pleuree glossy brown, yellowish 

 along suture and below wing base ; scutellum and postnotum concolorous 

 with disk of mesonotum; squamae whitish, fringe white. Abdomen 

 glossy black-brown; apical three segments and hypopygium of male pale 

 yellow, of female posterior margin of sixth segment distinctly pale yel- 

 low; apical segments brownish, ovipositor glossy black; last abdominal 

 segment in male slightly elongated; all segments with numerous short 

 black hairs, the apical segments with unusually weak posterior mar- 

 ginal bristles. Legs brown-black, glossy, knee joints paler; mid-tibia 

 with posterior bristles present, in some cases those number three, in- 

 stead of the normal two. Wings yellow at base; first costal division 

 almost one half as long as second; inner cross-vein at below, or slightly 

 beyond, end of first vein; subcostal vein indistinct, but complete; 



