328 Annals Entomological Society of America [Vol. VI, 



I 



arista is comparatively shorter and more distinctly swollen in schineri 

 than in tilice; and the posterior surface of mid tibia in schineri has no 

 distinct bristles. 



Length 2-2.5 mm. 



Originally described from Europe. 



Locality of specimens in U. S. National Museum collection: 

 Toronto, Canada, (collection W. Brodie) ; I have seen two 

 specimens reared from galls on Poplar by C. A. Frost, Framing- 

 ham, Massachusetts, submitted by C. W. Johnson. 



55. Agromyza congregata, new species. 



Male: This species is very similar to tilicB, but differs as follows: 

 The orbital bristles are four in number, strong and equally spaced; 

 the cheeks are comparatively higher, being at center rather more than 

 one-third the height of eye; the marginal mouth bristles are strong, 

 and form a group at the anterior angle of cheek, amongst which the 

 vibrissa is hardly distinguishable; the entire color of insect is a deep 

 black; the legs are strong and there is no trace of the posterior bristles 

 on the mid tibia; the wing venation is similar to tilicB. 



Length L75 mm. 



Type: Cat. No. 15589, U. S. N. M. 



Locality: Williams, Arizona, May, (H. S. Barber), one 

 male. 



Food-plant unknown. 



5G. Agromyza minima, new species. 



Male: Frons black, center stripe opaque, orbits and frontal 

 triangle glossy; breadth of frons one-third that of head; orbits narrow, 

 •each not one-fourth as wide as center stripe; four rather weak orbital 

 bristles present, the orbits with additional short hairs; face black, 

 opaque, concave in profile, mouth margin produced; cheek black, 

 short, highest at center, where it is about one-fourth as high as eye; 

 marginal bristles of moderate strength, the vibrissa weakly differen- 

 tiated; occiput not projecting; antennas of moderate size; third joint 

 regularly rounded, distinctly shorter than broad; arista not much swollen 

 at base, tapering, almost bare, its length equal to from its base to almost 

 upper orbital bristle. Mesonotum glossy black, with a slight bluish 

 tinge; two pairs of dorso-centrals present; pleurae concolorous with 

 disk of mesonotum; squamae gray, margin and fringe brown. Abdomen 

 glossy black, with a distinct metallic bluish tinge. Legs black; the 

 posterior mid tibial bristles distinct, though small. Wings grayish; 

 inner cross vein at slightly beyond end of first vein, and at slightly 

 beyond middle of discal cell; outer cross vein at about its own length 

 from inner, and at slightly beyond wing middle; last section of fifth 

 vein barely more than one-half as long as penultimate section; veins 

 3-4 almost parallel on their last section. 



Length slightly over 1 mm. 



