1913] Agromyza and Cerodontha. 315 



bristles weak; vibrissa distinctly differentiated though not very strong; 

 proboscis brown; palpi black, normal; occiput linear, the eyes very 

 large and occupying nearly the whole side of head. Mesonotum with 

 two pairs of dorso-centrals ; disk covered with short setulas; the pair 

 of bristles between the posterior dorso-centrals not differentiated 

 from the other discal setulce; squamae yellowish brown, fringe brown; 

 apical bristles on scutellum weaker than the basal pair. Abdomen 

 with segments covered with short setulce, those on the posterior mar- 

 gins slightly stronger; sixth segment slightly elongated; base of ovi- 

 positor not as long as preceding segment. Legs shining black; posterior 

 surface of mid tibia, in type, without any bristles. Wings clear; 

 second costal division a little over twice as long as first; subcostal 

 vein indistinct, coalescent with first at its apex; outer cross vein at 

 distinctly before wing middle, and at its own length from inner; fourth 

 vein rather indistinct from outer cross vein to apex; last section of 

 fifth distinctly, but not greatly, longer than penulate section; costa not 

 reaching beyond end of third vein. Halteres black. 

 Length 3 mm. 



Type: Cat. No. 15578, U. S. N. M. 



Locality: Plummers Island, Maryland, June 27, 1909^ 

 (W. L. McAtee), one female. 

 Food-plant unknown. 



41. Agromyza simplex Loew. 



Syn: Agromyza simplex Loew, Dipt. Amer. Sept., Cent. 8, 1869, species 84. 



Male and Female: Entirely shining black. Frons occupying 

 distinctly more than one-third the width of head ; center stripe opaque ;. 

 orbits glossy; ocellar region glossy; the frontal triangle distinguishable, 

 but not separated from center stripe by an impressed line; five orbital 

 bristles present, in addition to those there are numerous soft hairs 

 covering the entire surface, laterally, beyond the bristles, and stretching 

 from opposite base of antennas. to upper orbital bristle; antennae rather 

 small, second joint with moderately long dorsal bristle; third joint 

 rounded, with very short, whitish pile; arista bare, the base swollen, 

 length of arista equal to from its base to between uppermost two or- 

 bital bristles; face slightly keeled, concave in profile, opaque, brown- 

 black; cheeks opaque brown; orbits carried almost to hind margin of 

 eye, shining; height of cheek at anterior margin less than at posterior, 

 where it is about two-fifths as high as eye; marginal bristles rather 

 weak, upturned; vibrissa weakly differentiated; proboscis brown ^ 

 palpi black, normal. Mesonotum covered with short setulas; two 

 distinct pairs of dorso-centrals present, and in addition to these there 

 are generally 2-3 setulae anterior to them stronger than the discal 

 hairs; squamas black-brown, fringe concolorous; scutellum with the 

 apical two bristles weaker than the basal two. Abdomen broadly 

 ovate in female, somewhat narrower in male; no metallic sheen visible; 

 last abdominal segment in female elongate; apical bristles on seg- 

 ments not conspicuous; base of ovipositor not longer than preceding. 



