12 Journal New York Entomological Society. [Voi, xvii. 



The above description is from Professor Cockerell's type. The 

 following is Professor Cockerell's description of the gall of this species : 

 "Gall an oval abrupt lateral swelling on the twigs of Sa/i'x sp. (a 

 species with very narrow leaves), about lo mm. long and 7 broad, 

 pale and roughened." The flies emerged April 5 and 9. 



In color this species is much like orbitalis Nort. and bebbiance 

 Roh. The different emargination of the clypeus, the broken frontal 

 crest and the pale stigma will separate it from orbitalis. See remarks 

 under bebbiance to separate it from that species. The gall is much like 

 the supposed gall of brachycarpce Roh., and belongs to the ovum 

 group. I have collected galls at the mouth of Boulder Canon, Colo., 

 which look much like the galls of cooperce and are probably made by 

 this species. They were on Salix liitecysericea Rydb., a narrow-leafed 

 willow. 



I have a dark specimen of salicis-ovum Walsh which I received 

 from Dr. MacGillivray, which looks very much like coopercE Ckll., but 

 is not cooperce, may be known from the dark specimens o{ salicis-ovum 

 by the following characters : The ocellar basin more strongly defined, 

 the almost complete absence of the interocellar furrow, while in salicis- 

 ovum it is distinct but not strong ; the apical joint of antennae grad- 

 ually tapering, not obliquely truncate at the apex as in salicis-ovum ; 

 frontal crest strongly broken; clypeus more angularly emarginate ; 

 lower discal cell of hind wings exceeded by the upper, while in salicis- 

 ovum the lower is the longer ; sheath more obtuse at the apex. 



The gall of cooperce may be known from the gall of salicis-ovum 

 by its more abrupt form, salicis-ovum being somewhat sloping. 



4. Cryptocampus salicis-ovum (Walsh). 



Enura salicis-ovui/t \^a\s\\, Proc. Ent. Soc. Phil., vi, p. 252, 1866. 



Enura pcrtufbans Walsh, Proc. Ent. Soc. Phil., vi, p. 254, 1S66. 



Enura salicis-ovum Nort., Tr. Am. Ent. Soc, i, 1 867, p. $0. 



Enura perturbans Nort., loc. cit., p. 53. 



Enura salicis-ovum Walsh & Riley, Am. Ent., ii, 1S69, p. 49. 



Enura salicis-ovum Thomas, loth Rept., State Entomologist 111 , p. 69. 



Enura ovum Ashm., Colo., Biol. Assoc, p. 40, 1890. 



Enura salicis-ovum Ckll., Tr. Am. Ent. Soc, xx, p. 345, 1893. 



Enura ovum Beutenmiiller, Bull. Am. Mus. Nat. Hist., iv. Art. xv, p. 267 ; 



Am. Mus. Jn., iv. No. 4, Oct., 1904, p. 24. 

 Cryptocampus salins-ovu?n Dalla Torre, Cat. Hym., i, p. 278, 1894. 

 Cryptocampus pertubans Dalla Torre, loc. cit., p. 278. 

 Enura salicis-ovum Marlatt, Tech. Ser. 3, U. S. Dept. Ag., p. 20, 1896. 

 Cryptocampus salicis-ovum Konow, Genera Insectorum, p. 51, 1905. 

 Enura S. ovum Weldon, Can. Ent., Sept., 1907, pp. 299 and 302. 



