132 NEW YORK STATE MUSEUM 



This species appears to have been first observed by Mr Walsh, 

 who transmitted it to Osten Sacken under the manuscript name of 

 Cecidomyia helianthi-globulus. It is easily dis- 

 tinguished from the larger A. conspicua, according to Osten Sacken, 

 by the paler color of its hind tibiae and tarsi. The mesonotum is 

 distinctly lighter in color and the submedian lines more thickly 

 haired. Furthermore, the third antennal segment of the female 

 in this form has a length only five or six times its diameter, while in 

 A. conspicua the length is six or seven times its diameter. 

 The ovipositor of this species is hardly as long as the body, though 

 in A. conspicua it is about one-fourth longer. This species 

 occurs about New York. -The gall is found on the sunflower, 

 Helianthus giganteus, and also on H. g r o s s e- 

 serratus, the adults emerging in September and October. 



Gall. The galls of this form occur on the Helianthus stems from 

 a few inches to three feet above the ground. They are globular, 

 spherical or ovate in shape and range from three-eighths to 2 inches 

 in diameter. 



Male. Length 4.5 mm. Antennae nearly as long as the body, 

 sparsely fine haired, dark brown; 14 segments, the third with a 

 length five to six times its diameter. Palpi ; the first segment appar- 

 ently short, subglobular, the second irregularly subrect angular, with 

 a length three times its width, the third strongly compressed, slender, 

 acute distally and with a length more than twice the preceding; face 

 reddish brown. Mesonotum dark reddish brown, submedian lines 

 distinct, rather thickly clothed with fine, reddish hairs. Scutellum 

 yellowish brown, post scutellum a little darker. Abdomen yellowish 

 brown, rather sparsely clothed with fine, yellowish hairs; genitalia 

 dark brown. Wings hyaline, cost a yellowish brown ; halteres yellowish 

 basally, slightly fuscous apically. Legs a reddish brown, the distal 

 tarsal segments distinctly darker; claws long, stout, strongly curved, 

 the pul villi distinctly shorter than the claws. Genitalia; dorsal 

 plate broad, deeply and triangularly incised, the lobes acute. 



Female. Length 4.5 mm. Antennae light brown; 14 segments, 

 the third with a length fully six times its diameter. Palpi; the first 

 segment short, stout, subglobose, the second broader, subrectangular, 

 with a length more than twice its diameter, the third long, slender, 

 slightly expanded distally, about three times the length of the second; 

 face fuscous yellowish. Mesonotum purplish brown, the submedian 

 lines distinct, sparsely clothed with yellowish hairs. Scutellum 

 fuscous yellowish with a few yellowish setae, postscutellum yellowish 

 brown. Abdomen yellowish brown, thickly clothed with dark brown 

 scales, the segments sparsely margined posteriorly with rather long, 

 yellowish white hairs. Legs mostly a yellowish brown, the tarsi 

 slightly darker; the pul villi as long as the claws. Ovipositor probably 

 as long as the body. Type Cecid. 856. 



