304 Annals Entomological Society of America [Vol. VI, 



29. Agromyza angulata Loew. 



Plate XXIX, Fig, 16; Plate XXX, Fig. 18. 



Syn: Agromyza angulata Loew, Dipt. Amer. Sept. Indig., Cent. 8, 1869, 

 species 87. 



Male and Female: Frons deep black, with sometimes a slight 

 indication of paler color very narrowly along the inner margin of orbits; 

 central stripe opaque, orbits shining; breadth of frons distinctly over 

 one-third the head width, of orbits about one-half the width of center 

 stripe; generally 5 orbital bristles present; in addition to the bristles 

 there are numerous short hairs nearer to eye margin, forming an ir- 

 regular row from opposite insertion of antenna to upper bristle; ocellar 

 region glossy black; antennae black, of moderate size; dorsal bristle 

 on second joint distinct; third joint rounded at apex; arista brown, 

 basal fifth yellowish and swollen, pubescence very short, length of 

 arista equal to from its base to between upper two orbital bristles; 

 face and cheeks black, or black brown, opaque; the former with a slight 

 central keel, and a little produced at mouth margin; cheeks almost 

 linear, very little higher at posterior margin than at anterior; marginal 

 bristles in a double row, of moderate strength; vibrissa well differ- 

 entiated; proboscis yellow; palpi black, of normal size and shape. 

 Mesonotum glossy black, lateral margins sometimes brownish; four 

 pairs of dorso-centrals present, the posterior pair strong, the others 

 gradually reduced towards anterior pair, which are rather weak and 

 slightly in front of suture; 7-S irregular rows of short setulse between 

 dorso-centrals; no distinctly differentiated pair of bristles between 

 posterior dorso-centrals; pleuree glossy black, very narrowly lemon 

 yellow along upper margin to humerus, narrowly along vertical 

 mesopleural suture, more broadly at upper angles of that suture 

 and below wing base; postnotum and scutellum colored as disk of 

 mesonotum, squamee whitish yellow, fringe whitish. Abdomen 

 ovate, glossy black, sometimes with the segments very narrowly pale 

 yellow, or brownish; sixth segment elongated; all segments with numer- 

 ous surface hairs; apical margin of sixth segment with moderately 

 long bristles; hypopygium of male of moderate size, colored as abdomen, 

 base of ovipositor of female glossy black. Legs black, shining; fore 

 knees pale yellow, knees of hind pairs, fore tibise and tarsi brownish, 

 or yellowish; mid tibia without posterior bristles. Wings clear; bases 

 •of thick veins lemon yellow; first costal division one-half as long as 

 second; outer cross vein below, or slightly beyond end of first vein; 

 subcostal vein indistinct; first two sections of fourth vein subequal, 

 or the first slightly the shorter; last section of fifth twice as long as 

 penultimate section; veins 2-3-4 slightly divergent. Halteres pale 

 yellow. 



Length 1.5-2 mm. 



Originally described from Pennsylvania (Osten Sacken), 

 and since recorded from New Jersey, (Smith Cat.). Represented 

 in U. S. National Museum collection by four specimens from 



