AmerigAna 



VOL. YI. 



BROOKLYN, FEBRUARY, 1890. 



No. 2. 



NE\/V CYNIPIDiE. 



BY C. P. GILLETTE. 

 f)N BUR-OAK {Quercus macrocarpa). 



Neuroterus flavipes n. sp. Gall. — A hard woody swelling of 

 the mid-rib or one of the main veins of a leaf, the leaf becoming 

 much wrinkled and deformed as the result. Large galls measure 

 three-fourths of an inch in length and one-fourth of an inch in width. 

 The flies usually escape from the upper surface, sometimes through 

 a slightly raised teat-like projection. 



Galls were gathered at Ames, Iowa, July 6, iS88, from which 

 the flies had already begun to issue. 



Gall-fly — -Female. — Head, thorax and abdomen black; antennae 

 and legs light yellow; length 1.6 mm. 



Head entirely black, face very sparsely set with short gray hairs and 

 finely rugose; vertex, genae and occiput finely rugose. Antennae i3-j()inted, 

 first two joints stout, and nearly equal in length, third joint longest, fourth to 

 thirteenth subequal in length, last six or seven joints forming a slight club; 

 color light yellow. Thorax black, finely rugose, densely pitted on the shoul- 

 ders, and very thinly set with short gray pubescence. Two shining, black, 

 parallel lines, begin at the collar and run back about half way to the scutel- 

 lum. Parapsidal grooves shallow, and can be traced about two-thirds of the 

 way from the scutellum to the collar. Outside of each parapsidal groove is 

 a short depressed line beginning near the base of the scutellum and running 

 parallel with the groove past the base of the wing. Scutellum entirely black, 

 densely pitted, and with two shallow fovese that are almost obsolete. Legs 

 light yellow, with the thighs and tibiae dark, sometimes almost black ; base 

 of coxae and pulvilli black. Abdomen black, polished, and with very few 

 hairs. Ovipositor sheaths protruding. Wings hyaline ; veins rather slender 

 and light yellow in color, areolet wanting, cubitus and anal vein almost obso- 

 lete, and the radial nervure not reaching the costal margin. The anterior 



Entomologica Americana. Vol. VI. 



F'EBRU.^RV, 1890. 



