1913] Agromyza and Cerodontha. 325 



51. Agromyza websteri, new species. 



Male and Female: Frons deep black; center stripe opaque, orbits 

 and oceilar triangle glossy; width of frons almost one-half that of 

 head, narrower at anterior margin than posteriorly ; width of each orbit 

 about one-fourth that of center stripe; five orbital bristles generally 

 present, but sometimes there are six in aberrant specimens; besides the 

 bristles, which are situated on close to inner margin of orbit, there 

 is an outer irregular row of short black hairs; antennae of moderate 

 size, black with sometimes whitish pollinosity; second joint with dis- 

 tinct dorsal bristles, and weak apical hairs; third joint rounded, dis- 

 tinctly shorter than broad, pilosity very short, whitish; arista with a 

 •distinct, elongate thickening at base, which occupies almost one-third 

 the length of arista; pubescence very indistinct; length of arista equal 

 to from its base to middle of orbit; face opaque black; concave in 

 profile, the mouth margin slightly produced; cheek opaque black; 

 of almost equal height on its entire length, which is equal to about 

 ■one-fourth the eye height, marginal bristles in a double row, the upper 

 slightly upturned, of moderate length; vibrissa distinctly differentiated; 

 proboscis yellow-brown at apex; palpi black, slightly spatulate, weakly 

 l>ristled. Mesonotimi subshining black, with slight indications of 

 grayish pollinosity, especially on sides; disk very thickly covered 

 with short, upright, black setulae; three pairs of dorso-centrals present, 

 the anterior pair weak, and occasionally there are 2-3 setulse in line 

 with those, which are distinctly longer than the other discal setulae, but 

 which are clearly not macrochaeta; no differentiated bristles between 

 the posterior dorso-centrals; pleurae black, siibshining, sutures brownish; 

 squamas brown, or gray, the margin blackish, fringe black-brown; 

 scutellimi concolorous with disk of mesonotum. Abdomen shining 

 black; broadly ovate; segments with distinct dorsal setulae, those on 

 posterior margins, and especially on sixth segment, in female, longer; 

 sixth segment slightly elongated; base of ovipositor glossy black; 

 male hypop^^gium small, shining black. Legs black, shining; femora 

 strong; no bristles distinguishable on mid tibia in any of the specimens 

 before me. Wings grayish; veins brown-black; first costal division 

 distinctly more than one-half as long as second; subcostal vein distinct; 

 fused with first at apex; inner cross vein below end of first vein; outer 

 cross vein not upright, its upper extremity nearer to wing tip than its 

 lower, situated at generally less than its o-wti length from inner cross 

 vein, and its upper extremity just before wing middle; veins 3-4 dis- 

 tinctly divergent at their apices; last section and penultimate section 

 -of fifth vein subequal. Halteres black. 



Length 3.5-4 m.m. 



Type: Cat. No. 15587, U. S. N. M. 



Locality: Seattle, Washington, issued January 21, 1913, 

 from galls on twigs of pink wistaria from Japan, (F. M. Rhoder). 

 Another specimen from same lot, in poor condition January 



