62 H. F. BASSETT. 



They were collected for nie in southern Utah, in large numbers, 

 by Mr. A. H. Siler. 



Gall-flies of both sexes. — Bead black, finely and evenly punctate on the vertex 

 and with a few short mi('roscoi)ic hairs, broader than the narrow thorax ; an- 

 tennfB 14-joiuted, first joint large and round, second also round, but very small, 

 the third is more than twice as long as the two preceding taken together, the 

 fourth one-half as long as the third, remaining joints are subequal ; in the female 

 the first and second joints yellowish brown, the rest dull black; in the male 

 black throughout; in both sexes the autennse ai"e very slender, but those of the 

 female are shorter. Thorax black, finely rugose and hairy like the head, though 

 the hairs are longer, two smooth, parallel lines from the collar one-half way to 

 the scutellum, and a very short median line from the scutellum that almost im- 

 mediately disappears; the parapsidal grooves not smooth nor deep, converging 

 rapidly as they approach the scutellum ; scutellum small, rough and depressed at 

 its junction with the mesonotum. Legs: coxse dark, shining, lighter towards 

 the femur; femur, tibia and tarsi dark yellowish brown ; the legs of the male, 

 especially the posterior pair, are considerably darker than those of the female. 

 Abdomen of the female small, ycdlowish brown, darker towards the end, the first 

 segment pedicillate, the second very long and nearly concealing the remaining 

 ones; sheath of the ovipositor sharp pointed, as in all this genus; the abdomen of 

 the male is very small and shining black. Wings: veins dark and heavy, cubitus 

 very distinct and reaching quite to the first transverse; areolet medium size; 

 radial area faintly clouded on the second transverse vein in the male, and more 

 heavily clouded throughout in the female, except a small spot in the center; the 

 cloudiness extends slightly beyond the apex of the radial area. Length : body 

 male .10, female .11 inch. ; wings, male .12, female .14 inch. 



The description of the female does not apply to all the specimens 

 of this sex reared from these galls, as in some the radial area has no 

 cloud, but a simple broadening of the veins bounding it. As this defer- 

 ence is quite noticeable, and as the galls differ so much in form and 

 size, I am inclined to believe that there may be here two distinct, 

 but closely related species. 



4. R. UtaheiiNis u. sp. 



Mr. Siler sent me from Utah, several years ago, some very large 

 rose galls that did not differ, so far as I could see, from B. racUcum 

 O. S. It is true they were larger and less regular in form than that 

 species and showed more plainly that they originated in a leaf bud. 

 The largest specimen was three inches in diameter, and one or two 

 others Avere nearly as large. They appeared to have grown near the 

 surface of the ground, but not under moss or fallen leaves, as is the 

 habit of H. radicum. 



They were old galls and I reared nothing from them, but on cut- 

 ting them open I found several perfect insects, evidently Rhodiies, 



