1913] Agromyza and Cerodontha. 295 



Dedham, Auburndale, Fall River and Chester, Massachusetts; 

 Durham, New Hampshire, Winnipauk, Connecticut; Kingston, 

 Rhode Island, and Riverton, New Jersey, which agree well 

 with the description given. Three specimens from same 

 collection taken in the following localities: Chester and Blue 

 Hills, Massachusetts, and Delaware Water Gap, Pennsylvania 

 (Mrs. A. T. Slosson), differ in size, 3 mm., and in having an 

 anteriorly bidentate, yellow spot, posteriorly on each side of 

 disk, the pale color extending on to scutellum at base on each 

 side. I consider that this is merely a color variety, due pos- 

 sibly to a difference in food-plant, or some other cause which 

 could only be determined by rearing the species. 



21. Agromyza coquilletti, new species. 



Plate XXX, Fig. 28. 



Male and Female: Frons lemon yellow, subshining, center stripe 

 blackened, most distinctly on anterior margin where it meets the 

 lunule, which is exceptionally elongated, the black color generally 

 disappears on posterior part of center stripe; ocellar region black; 

 orbits black on posterior angle, each orbit half as wide as center stripe 

 at anterior ocellus, gradually broadened to anterior margins of center 

 stripe where each orbit is almost of equal width with center stripe; 

 four orbital bristles present, situated on middle of orbit, laterally 

 beyond these there is a row of 5-7 short setulee, which does not extend 

 to upper orbital bristle; antennse of moderate size, black, second joint 

 brownish; third joint twice as long as second, upper margin flattened 

 a little and apex rather acute, not regularly rounded; arista brown,, 

 thickened at base for about one-fourth the length of arista, nearly bare, 

 and as long as from its base to anterior ocellus; face almost perpendic- 

 ular, slightly produced at mouth margin, slightly keeled, yellow; cheeks 

 yellow, posteriorly almost one-third the length of eye, anteriorly much 

 less; marginal bristles of moderate size, vibrissa strong; proboscis yel- 

 low; palpi black. Mesonotum subshining, black, with grayish pol- 

 linosity; three pairs of distinct dorso-central bristles, the setulas anterior 

 to them stronger than the other discal hairs; lateral margins and humeri 

 pale yellow; the pair of bristles between posterior dorso-centrals weak; 

 pleurse brown-black, shining, upper margin and central, vertical, suture 

 narrowly yellow; squama and its fringe pale yellow; scutellum and post- 

 notum black, shining; abdomen brown-black, shining; all segments 

 narrowly margined with yellow posteriorly; hypopygium of male yel- 

 lowish-brown ; ovipositor of female glossy black, the base as long as 

 last abdominal segment. Legs glossy black, knees distinctly pale 

 yellow; posterior bristles absent from mid tibia; ventral bristles on fore 

 femur rather long. Wings clear, basal part of veins lemon yellow; 

 subcostal vein indistinct; outer cross vein a little before wing middle 

 and well beyond end of first vein; second section of fourth vein longer 



