114 NEW YORK STATE MUSEUM 



the third, dilated. Mesonotum dull black. Scutellum and post- 

 scutelltun deep orange. Abdomen deep red, the terminal segment 

 fuscous yellowish ; ovipositor yellowish. Wings hyaline, long, slender, 

 costa reddish. Halteres fuscous yellowish. Legs yellowish and 

 variably tinged with deep red; claws stout, strongly curved, the 

 pul villi nearly as long as the claws. Ovipositor short, the terminal 

 lobes slightly protuberant, short, tapering, narrowly rounded. 

 Cecid. ai94ia. 



Caryomyia caryaecola n. sp. 

 1862 Osten Sacken, C. R. Mon. Dipt. N. A., 1:192 (Cecidomyia) 

 1892 Beutemnueller, William. Am. Mus. Nat. Hist. Bui., 4:266 

 (Cecidomyia) 



1904 Am. Mus. Nat. Hist. Guide Leaflet 16, p. 27 (Cecidomyia) 



1906 Felt, E. P. Insects Affecting Park & Woodland Trees, N. Y. State 

 Mus. Mem. 8, 2:619, 628, pi. i, fig. 28 (Cecidomyia) 



1907 Cook, M. T. Acad. Sci. Proc, separate, p. 7 (Cecidomyia) 



1908 Jarvis, T. D. Ent. Soc. Ont., 38th Rep't, p. 87 (Cecidomyia) 



1909 Jarvis, T. D. Ent. Soc. Ont., 39th Rep't, p. 84 (Cecidomyia) 



1910 Stebbins, F. A. Springfield Mus. Nat. Hist. Bui. 2, p. 13 

 1915 Felt, E. P. N. Y. vState Mus. Bui. 175, pi. 4, fig. 9 

 1918 — N. Y. State Mus. Bui. 200, p. 43 



Galls, made by the above-named species, were taken on bittemut 

 hickory at Hamburg, N. Y., October 17, 1907. They were limited, so 

 far as we observed, entirely to the bittemut hickory (Carya cordi- 

 f o r m i s ) . Apparently the same species has been recorded by Jarvis 

 as being locally common in Ontario on sweet hickory (Carya 

 alba). Specimens gathered in the fall would presumably produce 

 adults the following June, there being apparently one generation 

 annually. The earlier bibUographic references cited above pre- 

 sumably refer to this species. The gall described below agrees very 

 closely with specimens collected by Osten vSacken, deposited in the 

 Museimi of Comparative Zoology at Cambridge, Mass., and bearing 

 the label Cecidomyia caryaecola. 



Gall. The galls (pi. 10, figs. 2, 3) were almost invariably clustered, 

 usually thickly, along or close to the midrib; three to eight or ten 

 in a group, and sometimes two or three clusters on the underside of 

 one leaf. The gall is subglobular, about 3-4 mm in diameter and 

 almost invariably with a long, slender apical process as long or a 

 little longer than the basal enlargement. The color in late fall is 

 a pale greenish, the elongate tip being a variable dark reddish brown. 

 The gall matures in October and drops from the leaves readily. 



This gall is presumably distinct from the one appearing imder the 

 name of Caryomyia caryaecola O. S. in " Key to American Insect 

 Galls," N. Y. State Musetim Bulletin 200, p. 43 and plate 6, figs. 2, 

 3, 1918. 



