REPORT OF THE STATE ENTOMOLOGIST I917 127 



1906 Felt, E. P. Ins. Affec. Pk. & Wdld. Trees, N. Y. .State Mus. Mem. 8, 

 2 : 732 (Cecidomyia) 



1908 — N. Y. State Mus. Bui. 124, p. 393 (Contarinia) 



1910 Stebbins, F. A. Springf. Mus. Nat. Hist., Bui. 2, p. 33 (Contarinia) 



This species is not rare on the tuhp in the vicinity of Albany, 

 and is very common farther south, particularly in North Carolina 

 where it is sometimes so abundant as to mar seriously the foliage 

 toward the end of the season. Our observations at Albany show 

 that there are two and possibly more generations annually, while 

 J. G. Jack, who studied this insect in the vicinity of Boston, states 

 that there are three or more generations, the broods so overlapping 

 that some larvae may almost always be found. He states that the 

 first eggs are probably laid in the spring on the unfolding leaves, 

 while the last larvae attain full growth about the end of vSeptember. 

 They escape from the blister mine through a slit and enter the 

 ground, the late appearing larvae probably remaining unchanged 

 until spring. 



Gall. A nearly circular, somewhat convex blister mine about 5 

 mm in diameter. There is a dark brown center surrounded by a 

 light brown, irregular area which is slightly darker on its outer 

 margin. The appearance is approximately the same on both sur- 

 faces, the coloration being a little deeper on the upper. The partly 

 developed gall has a dark brown, slightly elevated, circular central 

 part surrounded by pale green, which in turn is encircled by pale 

 yellow, shading into pale green, and that into the color of the normal 

 leaf tissue. 



Male. Length 1.5 mm. Antennae one-half longer than the 

 body, thickly haired, light brown; 14 segments, the fifth with stems 

 three-fourths and two times their diameters, respectively; terminal 

 segment, distal enlargement greatly reduced, with a length about 

 one-half greater than its diameter, apically a short, stout process. 

 Palpi; probably quadriarticulate. Mesonotum reddish brown, sub- 

 median lines pale yellowish. Scutellum yellowish brown, postscutel- 

 lum and abdomen reddish brown, the latter sparsely haired. Wings 

 hyaline, costa light brown. Legs a variable brown; claws long, 

 slender, strongly curved, the pulvilli apparently absent. Genitalia 

 indis inct in the preparation. 



Female. Length 1.5 mm. Antennae a little shorter than the 

 body, sparsely haired, light brown; 14 cylindric subsessile seg- 

 ments, the fifth with a stem about one-fourth the length of the basal 

 enlargement, which latter has a length two and one-half times its 

 diameter and is slightly constricted near the basal third; terminal 

 segment, basal enlargement slender, with a length five times its 

 diameter and apically with a short, stout, subglobose appendage. 

 Palpi; the first segment short, stout, irregularly subquadrate, the 

 second a little longer, broadly oval, the third probably longer than 

 the second, rather stout, the fourth apparently twice the length 



