164 NEW YORK STATE MUSEUM 



the fifth with a length two and one-half times its diameter; subbasal 

 whorl scattering, subapical whorl rudimentary; indistinct circum- 

 nli near the basal third and apically and with a variable anastomo- 

 sis between ; terminal segment with a length four times its diameter, 

 evidently composed of two. Palpi; first segment short, stout, the 

 second rectangular, with a length nearly four times its diameter, 

 the third a little longer, more slender, the fourth longer and more 

 slender than the third. Mesonotum dark brown, the submedian 

 lines and the median posterior area yellowish. Scutellum yellowish 

 red with numerous yellowish apical setae, postscutellum yellowish. 

 Abdomen yellowish with the basal segments tinged with red, the 

 first slightly darker. Wings hyaline, costa reddish brown. Halteres 

 and coxae yellowish transparent; femora and tibiae yellowish tinged 

 with red, tarsi somewhat darker; claws slender, evenly curved, the 

 pulvilli shorter than the claws. Ovipositor about two-thirds the 

 length of the abdomen. Type Cecid. 49c. 



Cincticornia pilulae Walsh 



1864 Walsh, B. D. Ent. Soc. Phil. Proc, 2:481-82 (Cecidomyia q. 

 pilulae) 



1869 Am. Ent., 2:29 (Cecidomyia) 



1890 Packard, A. S. U. S. Ent. Com. 5th Rep't, p. 206-7 (Cecidomyia) 

 1892 Beutenmueller, William. Am. Mus. Nat. Hist. Bui. 4:269 (Cecidomyia) 



1894 Am. Mus. Nat. Hist., Guide Leaflet 16, p. 30 (Cecidomyia) 



1902 Cook, M. T. Ohio State Univ. Bui. 15, ser. 6, p. 267 (Cecidomyia) 



1905 Dep't Geol. & Nat. Res. Ind., 29th Rep't, p. 841 (Ceci- 

 domyia) 



1906 Felt, E. P. Ins. Affec. Pk. & Wdld. Trees, N. Y. State Mus. Mem. 8, 

 2:619, 627 (Cecidomyia) 



1908 N. Y. State Mus. Bui. 124:380, 381 



1909 Ent. Soc. Ont., 39th Rep't, p. 45 



1910 Stebbins, F. A. Springf. Mus. Nat. Hist. Bui. 2, p. 18 



This species appears to be one of the commonest representa- 

 tives of the genus. The gall is by no means rare on various species 

 of oak in the vicinity of Albany and in other parts of the country. 

 It is presumable that all of the citations given above relate to this 

 form, though we have reared Cynipids from galls supposed to be made 

 by Cincticornia on several occasions. It would not be surprising 

 if the work of two very dissimilar insects had been confounded 

 occasionally. The late Dr M. T. Thompson of Clark University 

 records the appearance of the young gall at Worcester, Mass., the 

 second week in June, while Professor Beutenmueller states that in 

 the vicinity of New York City it begins to develop in May and 

 becomes full size by August or September. At first it is blister- 

 like, yellow or pale brown and surrounded by a light-green ring. 

 The full-grown gall varies greatly in size, ranging from about 3 to 



