1892.] ENTOMOLOGICAL NEWS. 247 



Radicum O. S. — A single gall was taken from the root of a 

 rose in northwestern Colorado in August, 1891, but being imma- 

 ture, no flies issued from it. 



Rosafolii Ashm. — I found the galls of this species quite com- 

 mon at Manitou in September, 1892, and have taken a few speci- 

 mens from rose leaves in the vicinity of Fort Collins. 



Tiiberadator Riley, MS. — Galls of what I suppose to be Riley's 

 tiiberadator I have found common at Fort Collins, Manitou and 

 Dolores, during the past Summer. 



ANTISTROPHUS. 



Pisiim Walsh. — Galls common on stems oi Lygodesmia juncea 

 in the vicinity of Fort Collins. 



ANDRICUS. 



But two species of this genus have been taken, both of which 

 are new. 



D. celliilarms n. sp. Galls. — The galls are small, thin capsules, 

 occurring singly in the buds of Quercus undulata. The bud 

 scales cover the galls completely, and there is nothing to indicate 

 their presence until the fly escapes, leaving a small round hole. 



Gall-fly 9- — Black, with reddish yellow feet, antennae and jaws. 

 Length 1.5 mm. Head black and shining, face coarsely striate between 

 the eyes and mouth; vertex, occiput and genge having a Hne crackled ap- 

 pearance, ocelli rather inconspicuous, frontal ridge beneath antennae broad 

 and prominent, mandibles reddish yellow, except at the very tips, where 

 they are black, palpi whitish; antennae 13-jointed, reddish yellow in color 

 and infuscate at tip; last joint as long as the two preceding together; 

 slightly clavate. Thorax black and with crackled appearance like the 

 head; parapsidal grooves sharply defined, scutellum bifoveate and coarsely 

 rugose, pleurae coarsely aciculate. Abdomen black and highly polished. 

 The large second segment covers nearly the entire surface, fully seven- 

 eights of it. Feet reddish yellow, hind tibiae and femora more or less 

 infuscate in some specimens. Wings hyaline, slightly longer than the 

 body; iubcostal, radial and transverse nervures rather stout, the others 

 very weak, the areolet only discernible in very favorable light. 



Described from thirty female flies bred from galls taken at 

 Trinidad, Col., May 14, 1892. The flies began emerging May 

 20th. No males were obtained. 

 A. freqnens n. sp. 



Galls. — The galls are dense corky enlargements of small limbs 

 ol Quercus tmdulata. They are irregular in size and shape, and 



