300 Annals Entomological Society of America [Vol. VI, 



Mesonotum shining, brown-black on disk, with gray dusting, humeri and 

 lateral margins reddish yellow; five pairs of dorso-central bristles 

 present, the anterior three pairs reduced in size, only the front pair 

 anterior to suture; the pair of bristles between the posterior dorso- 

 centrals very strong; disk with numerous setulose hairs; pleurae brown, 

 shining, sutures and below wing base yellowish; squamee whitish yel- 

 low, fringe concolorous; scutellum and postnotiim concolorous with 

 disk of mesonotum. Abdomen reddish yellow; last segment not 

 elongated; base of ovipositor glossy black, slightly longer than preceding 

 abdominal segment; all segments with nuinerovis black bristle-like 

 hairs. Legs yellow, stout; posterior side of mid tibia with two bristles. 

 Wings slightly grayish; costa thickened at end of first vein, first costal 

 division (to near side of first vein) less than one-half as long as next 

 division (from end of swollen junction of first vein with costa); upper 

 end of outer cross vein below a point in costa beyond middle of wing; 

 veins 2-3 distinctly, 3-4 hardly divergent; section of fourth vein beyond 

 inner cross vein one and one-half times as long as outer cross vein, 

 and distinctly longer than preceding section of fourth; inner cross vein 

 below junction of first vein with costa; last section of fifth vein three- 

 fifths as long as penultimate section; basal part of wing veins clear 

 yellow. Halteres yellow, knob whitish. 

 Length 3 mm. 



Type: Cat. No. 15571, U. S. N. M. 



Locality: Cottage Beaulieu, Ottawa, Canada, August 14,. 

 1906, (Germain Beaulieu), one female. 

 Food-plant unknown. 



26. Agromyza laterella Zetterstedt. 



Syn: Agromyza laterella Zetterstedt, Ins. Lappon, 1838, p. 788, species 7. 



Agromyza grossicornis Zetterstedt; Dipt. Scand. Vol. XIV, 1860, p. 64.56. 

 Agromyza magnicornis Loew, Dipt. Amer. Sept. Indig., Cent. 8, 1869, 

 species 86. 



Male and Female: Frons about one-half as broad as head, center 

 stripe opaque, brownish or blackish, with slight whitish dusting, orbits 

 shining, four or five orbital bristles anterior to front ocellus, beyond 

 these, laterally, is an irregular row of hairs; frontal lunule whitish 

 dusted, very distinct; ocellar region shining black; antennae black; 

 in male large, third joint very variable both in size and shape, either 

 subquadrate, elongated and truncate at apex, or enlarged and rounded 

 at apex, very thickly covered with distinct, pale pilosity; in female 

 the third antennal joint is much smaller and rounded; arista black, 

 inserted near base of third joint, thickened on basal third, pubescence 

 very short and indistinct, length of arista equal to froin its base to second 

 uppermost orbital bristle; head of male slightly produced in front, 

 the frons slightly buccate; face concave; cheeks short, distinctly higher 

 posteriorly than anteriorly, but at highest part not one-fourth as high 

 as eye, marginal bristles distinct; vibrissa well differentiated; proboscis 

 yellow; palpi black, normal; occiput unprojecting on upper half. Meso- 

 notum black, slightly shining, indistinctly gray dusted, lateral margins- 



