1913] Agromyza and Cerodontha. 275 



1. Agromyza xanthophora Schiner. 



Syn: Agromyza xanthophora Schiner, Reise d. Novara, Vol. I, 1868, p. 291. 

 Agromyza picta Coquillett, Jour. N. Y. Ent. Soc, Vol. X, 1902, p. 188. 



Female: Head black; frons opaque, orbits slightly shining, very 

 narrow; ocellar region raised, sub-shining, distance between ocelli less 

 than the distance from either ocellus to eye; lower orbital bristles 

 cruciate, second pair slightly inwardly directed, the upper two pairs 

 backwardly directed, the center pair in vertical row divergent, outer 

 slightly convergent, post-vertical pair divergent. Frontal lunule 

 yellow, with white pollinosity; face brown, sub-opaque, concave, 

 unkeeled; cheeks almost linear, narrowest posteriorly, mouth margin 

 with numerous hairs, and one strong incurved anterior vibrissa; antennae 

 black, third joint of moderate size, rounded, arista thin, slightly thick- 

 ened at base, longer than the distance from its base to post-vertical 

 bristle, thickly covered with pubescence, which is as long as the diam- 

 eter of arista at base. Proboscis pale yellow; palpi black, slightly 

 thickened. Thorax yellow; disk of mesonotum shining, but not 

 glossy, with a black mark covering all but the margins anterior to the 

 suture, which is sharply indented transversely at suture, subquad- 

 rately excised centrally on the posterior margin, does not reach to 

 scutellum, and has a dentiform longitudinal excision in each lateral lobe 

 posteriorly; four pairs of dorso-central bristles present, the anterior two 

 pairs reduced in size, the anterior pair just in front of suture; all black 

 portion of disk with short hairs, yellow portion bare, except for 5-6 

 scattered hairs present on the central posterior excision. Pleur£e with 

 the upper half yellow, lower half black; squamae yellow at base, apically 

 black, the hairs brown; scutellum yellow, disk bare, margin with 4 

 bristles ; postnotum black. Abdomen yellow, third and fourth segments 

 with indications of a central and two lateral dark spots, most distinct 

 on fourth; fifth and sixth segments glossy black; all segments with 

 numerous black hairs which are bristle-like on posterior margins and 

 most noticeable on fifth. Coxag and legs entirely shining black; the 

 mid tibia with the usual two posterior bristles. Wings slightly infus- 

 cated on anterior half; subcostal vein only indistinct at apex, costa 

 from himieral vein to end of first vein about two-thirds as long as next 

 costal division; second, third and fourth veins slightly divergent; outer 

 cross vein as long as penultimate section of fourth, which is distinctly 

 shorter than the preceding section of fourth; penultimate .section of 

 fifth slightly longer than last section. Halteres pale yellow. 



Length, 3 mm. 



Besides the type specimen of picta from Frontero, Tabasco, 

 Mexico (C. H, T. Townsend), there is in the U. S. National 

 Museum collection one female from Las Cruces, New Mexico, 

 June, 1893, (T. D. A. Cockerell). 



Food-plant unknown. 



