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. 



Rosfcfolii 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. 



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

 tuberculator I have found common at Fort Collins, Manitou and 

 Dolores, during the past Summer. 



ANTISTROPHUS. 



Pisum Walsh. Galls common on stems of Lygodesmia juncca 

 in the vicinity of Fort Collins. 



ANDRICUS. 



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

 are new. 



D. cellularius 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 ja\\s. 

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

 the eyes and mouth; vertex, occiput and geiue having a fine crackled ap- 

 pearance, ocelli rather inconspicuous, frontal ridge beneath antenna- bi 

 and prominent, mandibles reddish yellow, except at the very tips, u 1 

 they are black, palpi whitish; antennae i3-jointed, reddish yellow in r< >! 

 and infuscate at tip; last joint as long as the two preceding 4ogether; 

 slightly clavate. Thora.v 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 tibia.- and femora more or K-s-, 

 infuscate in some specimens. //7//;'v hyaline, slightly longer than the 

 body; subcostal, radial and transverse n.-rvuivs 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, 1X92. The flies began enicr^in- May 

 2oth. No male> were obtained. 



A. frequens n. sp. 



Galls. The galls are dense corky enlargements of small limbs 

 of Quercus undulata. They are irregular in si/e and shape, and 



