1913] Agromyza and Cerodontha. 327 



bare except apically on sides, as long as the elongate sixth segment. 

 Legs shining black; the posterior bristles on mid tibia distinct. Wings 

 grayish; veins black-brown; subcostal vein distinct, fused with first 

 at its apex; outer cross vein at wing middle, and at its own length from 

 inner cross vein; inner at distinctly beyond middle of discal cell; last 

 section of fifth vein not two-thirds as long as penultimate section; 

 veins 3-4 slightly divergent at apices. Halteres black. 

 Length 2 mm.. 



Type: Cat. No. 15588, U. S. N. M. 



Locality: Frontera, Tabasco, Mexico, March, (C. H. T, 

 Townsend). One female. 

 Food-plant unknown. 



53. Agromyza tiliae Couden. 



Syn: Agromyza tilicB Couden, Proc. Wash. Ent. Soc, Vol. IX, 1907, p. 34. 



Female: This species is very similar to A. websteri, but differs 

 as follows: The antennse are smaller, the third joint being rather 

 below the average size; the arista is not so distinctly thickened at 

 the base, nor for such a long distance, the thickening tapering gradually; 

 the mesonotum is shining black; with two pairs of dorso-centrals ; 

 the pleuree, scutellum, and abdomen glossy black; the squamas and 

 legs are similar in color to websteri, but the mid tibiae has the posterior 

 bristles distinct, though small; and in size tilice averages less, 2-3 mm. 

 The venation in both species is rather variable, but the outer cross 

 vein is generally at less than its own length from the inner. 



The type series which is in rather poor condition, was 

 reared from the galls on twigs of lime trees. Locality: Jen- 

 nings, Missouri, March-April, 1907, (Mrs. Hickey). 



The twig in collection shows the galls arranged on the 

 surface, independent of the position of the leaf buds, whereas 

 in websteri the galls are apparently confined to the bases of the 

 buds. There are two specimens in collection, one male Veitch, 

 Virginia, June 9, 1912, (F. Knab), and one female, Delaware 

 County, Pennsylvania, July 23, 1892 (no collector's name), the 

 former at least of which belongs to this species. 



54. Agromyza schineri Giraud. 



Syn: Agromyza schineri Giraud, Verb, zool.-bot. Ges. Wien, Vol. II, 1861, 

 p. 484. 



Male and Female: This species is very similar to tilicB but difters 

 as follows: The frons is distinctly broader, being over one-third as 

 wide as head; the orbits are broader, the ocellar triangle is broader 

 and shorter than in tilice, the ocelli not forming an equilateral triangle 

 as in that species, the distance between the posterior pair being dis- 

 tinctly greater than that between those and the anterior one; the 



