274 NEW YORK STATE MUSEUM 



Rhopalomyia arcuata Felt 



1907 Felt, E. P. N. Y. State Mus. Bui. no, p. 158-59 



1908 N. Y. State Mus. Bui. 124, p. 367 



This species was taken at Albany, N. Y., June 4, 1906 while 

 sweeping Solidago and sweet fern. 



Male. Length 2 mm. Antennae probably as long as the body, 

 sparsely haired, pale straw; at least 15 segments, the fifth with 

 a stem one-fourth longer than the slightly fusiform basal enlarge- 

 ment. Palpi composed of one rather long, fusiform segment, acute 

 distally. Face dark brown, sparsely clothed with fuscous hairs. 

 Scutellum yellowish brown, sparsely setose apically; postscutellum 

 orange brown. Abdomen thickly clothed with fuscous hairs, dark 

 brown. Wings hyaline, costa light brown. Halteres yellowish 

 transparent basally, fuscous apically. Coxae fuscous yellowish. 

 Legs pale straw, the claws stout, slightly curved. Genitalia; basal 

 clasp segment stout; terminal clasp segment short, stout; dorsal 

 plate short, broad, slightly emarginate. Harpes short, irregular, 

 much convoluted, the curved ventral and posterior margins strongly 

 chitinized. Type Cecid. 124. 



Rhopalomyia gutierreziae Ckll. 



1901 Cockerell, T. D. A. Can. Ent., 33: 23 (Asphondylia) 

 1908 Felt, E. P. N. Y. State Mus. Bui. 124, p. 367, 368 



This species produces a pale green, fusiform or suboval swelling 

 in the flower heads ofGutierrezia sarothrae. The gall is about 

 7 mm long, 3 mm broad and was taken at Las Vegas, N. M., adults 

 appearing October 31st. An examination of the types in the United 

 States National Museum shows that it probably belongs to this 

 genus. Professor Cockerell, writing September 9, 1907, transmits 

 what he considers as probably the same insect taken by Mr Frank 

 Springer on the same plant, the adults appearing at the time of 

 writing and emerging from apparently unmodified florets. Pro- 

 fessor Cockerell states that the female he described had 17 antenna! 

 segments, while the one transmitted had about 13 or 14 seg- 

 ments. It may be that there arc two entirely different insects, 

 in which event this form must, be a new species. The following 

 descriptions have been drafted from these specimens, except that 

 certain color characteristics have been taken from Professor Cock- 

 erel l's original description. 



Male. Length 1.5 mm. Antennae extending to the fourth 

 abdominal segment, sparsely haired, pale brown; 15 segments, the 

 fifth with a stem two-thirds the Length o\ the basal enlargement, 



which latter has a. length One-half greater than its diameter and is 

 roundly tapering at both extremities; terminal segment produced, 



