106 PROCEEDINGS OF THE NATIONAL MUSEUM vol.68 



second with large pubescent areas on sides, hind margin at angle of 

 45°, ventral A^alves oblique, ventral spine slender, tapering, pubescent 

 underneath, in side view about five times as long as broad. Using 

 width of head as a base, the length of mesonotum ratio is 1.34, 

 antenna 1.7, wing 3.4. Length of the single specimen, 5.3 mm. 



Type.— C>At. No. 27222, U.S.N.M. Holotype. 



Host. — Quercus jyalustris. 



Gall (fig. 26). — A bud gall of early spring as new growth is 

 starting. Spindle-shaped, blunt at both ends, up to 14 mm. long 

 by 5 nun. in diameter, smooth, mottled with white when fresh, 

 falling to ground when mature. Produced from weak lateral buds. 



Habitat. — The type fly was reared from a gall collected May 9, 

 1920, on Q. palustris at " Dyche " on the wooded banks of the Poto- 

 mac below Alexandria, Va. The fly was found dead in breeding 

 cage April 10, 1921, Similar galls have been found in spring on 

 Q. coccinea at Ravinia and Fort Sheridan, 111.; Miller, Ind.; and 

 Washington, D. C. A shorter and broader gall with the same struc- 

 ture was seen on Q. wibricaria at Joliet, 111. 



AMPHIBOLIPS ILICIFOLIAE (Bassett) 



Crosby and Schradieck collected galls on Q. ilicifolia at Riverhead 

 and East Hampton, Long Island, on July 20, from which all but 

 one of the flies had already emerged. Probably the normal emer- 

 gence period is late June or early July. 



AMPHIBOLIPS INANIS (Osten Sacken) 



The " empty oak apple " has been collected at the following 

 localities: Evanston, Lake Zurich, Glen Ellyn, La Grange, New 

 Lenox, Joliet, Palos Park, Willow Springs, and Moline, 111. ; Porter, 

 Ind.; Manistee and Onekama (T. Hatfield), Mich.; Delevan (D. 

 Watt), Wis.; Ironton. ]\ro. ; Tuskahoma, Okla.; Plummer Island, 

 Md.; Apple Orchard Camp, in Bedford County (C. J. W.), and 

 Bluemont, Va. ; Blue Hills, Mass.; Medina and Ithaca, N. Y. ; and 

 Ottawa (F. Johansen), Canada. Brodie collected galls at Toronto. 



The galls are 18-32 mm. in diameter, light green with irregularly 

 scattered purplish spots, wall thin and somewhat translucent, pro- 

 duced singly on under side of leaf. At Evanston adults issued in 

 various seasons on June 25, June 11, July 6; at Ottawa, July 8; in 

 mountains of Virginia on July 9. 



AMPHIBOUPS NIGRA Beutenmueller 



This species, whose gall was described as on an unknown oak in 

 Durango, Mexico, occurs in Arizona where the writer has collected 

 galls on Quercus emoryi and Q. hypoleuca in Huachuca Mountains, 



