1913] ' Agromyza and Cerodontha. 313 



38. Agromyza viridula Coquillett. 



Syn: Agromyza viridula Coquillett, Jour. N. Y. Ent. Soc, Vol. X, 1902, p. 190. 



Female: Frons black, center stripe opaque, orbits distinctly 

 differentiated, shining; breadth of head one-third, or slightly over one- 

 third, the head width; each orbit about one-fourth as wide as center 

 stripe; four strong orbital bristles present, and beyond these, laterally, 

 an irregular row of short hairs; lunule white pollinose; oc^llar region 

 shining black; antennee of moderate size, second joint with distinct 

 dorsal bristles and very weak apical hairs; third joint rounded, not 

 as long as broad, covered with very short, whitish pile; arista thickened 

 at base, tapering on basal third, bare, as long as from its base to an- 

 terior ocellus; face black, opaque, concave in profile, mouth margin 

 slightly produced, keel very slight; cheek linear at anterior margin, 

 at posterior margin about one-sixth as high as eye, marginal bristles 

 moderately strong, increasing in length towards anterior margin; 

 vibrissa differentiated; occiput not visible on upper half; proboscis 

 yellow; palpi black, of moderate size, the bristles distinct. Mesonotum 

 glossy black; the pair of bristles between posterior pair of dorso-centrals 

 well defined; pleurae glossy black, brownish below wing base; squamas 

 whitish, fringe white; bristles on scutellum subequal. Abdomen 

 glossy black, with a distinct brassy sheen, ovate, bristled as in par- 

 vicornis. Legs shining black; tarsi brownish; mid tibia with posterior 

 pair of bristles distinct. Wings clear, veins black-brown; second 

 costal division 2 3^ times as long as first; subcostal vein distinct; 

 fused with first at its apex; inner cross vein at slightly before end 

 of first vein, and distinctly before middle of discal cell; outer 

 cross vein at wing middle, and l}/^ times its own length from 

 inner cross vein; last section of fifth vein little over one half as long as 

 penultimate section, sixth vein distinctly short of wing margin. Hal- 

 teres with yellow stalk and white knob. 



Length 2.5-3 mm. 



Redescribed from type specimen (Cat. No. 6660, U. S. N.M.) 

 Locality: District of Columbia, June, (collection Coquil- 

 lett). The other specimens in collection are from District 

 of Columbia, July; Maryland, June; Georgia; Beverly, Mass.; 

 June 29, 1876, (Burgess) ; and three specimens from the West 

 Indies in poor condition that probably belong to this species, 

 Aguadilla, and Mayaguez, Porto Rico, (A. Busck), and St. 

 Domingo, (A. Busck). These specimens are slightly smaller 

 than the type, but have no distinctive characters by which 

 they may be separated. I have also seen one specimen sub- 

 mitted by Prof. Chittenden of the Bureau of Entomology, 

 from Piano, Texas, June, 1907 (E. S. Tucker) No. 561. There 

 are three specimens in Prof. Webster's material labelled "Reared 

 from blotch mine red oak leaf, June 20, 1912." Lafayette, 

 Indiana, (J. J. Davis). 



