1913] Agromyza and Cerodontha. 321 



47. Agromyza virens Loew. 



Dipt. Amer. Sept. Indig. Cent. 8, 1869, species 84. 



Male and Female: Frons black, orbits and ocellar triangle glossy, 

 center stripe opaque; breadth of frons slightly over one-third that of 

 head; breadth of orbits over one-third that of center stripe; five orbital 

 bristles generally present, the orbits densely covered with short, fine, 

 hairs ; frons generally slightly buccate ; antennae brown-black, of moder- 

 ate size; third joint rounded; arista shghtly swollen at base, very thickly, 

 but shortly pubescent; as long as from its base to upper orbital bristle; 

 face concave in profile, brown-black; cheeks higher at posterior than 

 anterior margin, at highest part about one-fourth as high as eye; 

 marginal bristles of moderate strength;. vibrissa differentiated; proboscis 

 brown; palpi black, normal; occiput slightly projecting; eyes generally 

 distinctly and thickly pubescent above. Mesonotum glossy black, 

 with sometimes a bluish or greenish tinge; squamae white, or yellowish, 

 the margin yellowish, fringe pale yellowish, or white. Abdomen 

 glossy black, generally with a metallic tinge, either bluish, greenish, 

 or bronzy; in shape and vestiture as in tilicE. Legs as in tilice; the poster- 

 ior mid tibial bristles distinct. Wings grayish, or almost clear, veins 

 brown; venation almost as in tilice.. 



Length 1.5-2.5 mm. 



vSpecimens from Lafayette, Indiana (F, M. Webster). Mining 

 in roots of clover. There are five other specimens in collection with 

 Webster's No. 10,073, from Lafayette, Indiana; one from Glad- 

 brook, Iowa, February 14, 1890, (No. 4608) mining in stems of 

 Ambrosia artimisaejolia (A. M. Sharp); two from Cambridge, 

 Massachusetts, "mining in stems of a weed" (H. G. Hubbard); 

 one marked 3042o, referred to as a Tachinid in notes, from 

 stem of a weed in which some, species of Cecidomyid was 

 mining, April 18, 1883 (locality doubtful) ; two specimens labeled 

 "Parasitic on Cecidomyid on aster with yellow flowers," May 

 23, 1884 (locality doubtful) ; two from stems of Ambrosia, 

 March, 1895, District of Columbia, one from Nabalus albus, 

 May 14, 1883 (locality doubtful) ; two from California (Ala- 

 meda and Los Angeles) , collection Coquillett ; one from Georgia, 

 no other data; one from Flag-staff, Arizona, July, (H. S. Bar- 

 ber). One from Plummers Island and four from Washington, 

 D. C. are in the collection of W. L. McAtee and a series of 

 13 specimens from the Brodie collection are in the U. S. National 

 Museum collection, locality Toronto, Ontario, Canada. 



In some cases, I believe with specimens which have been 

 on the wing, it is not very easy to see the hairs on the eyes, 

 but in freshly emerged examples these are very noticeable on 



