ART. 10 GALL-IXHABITING CYNIPID WASPS WELD 97 



areolet reaching about one-sixth way to basal, cubitus indistinct. 

 Abdomen longer than head and thorax, length to height to width as 

 27 : 23 : 17, length of tergites along dorsal curvature as 53 : 18 : 9 : 5 : 

 6 : 4, ventral spine long, slender, in side view eight times as long as 

 broad. Using width of head as a base, the length of mesonotum 

 ratio is 1.3, antenna 2.5, wing 4.1. Length, 1.8-2.1 mm. Average of 

 four, 2.1 mm. 



Type.— Qui. No. 27221, U.S.N.M. Paratypes in American Mu- 

 seum and Field Museum. 



Host. — Quercus alba. 



Gall (fig. 25). — A bud gall half protruding beyond the bud scales, 

 produced in the fall and probably dropping to the ground when 

 mature. Somewhat globular with a nipple at apex, green or brown- 

 ish, smooth, truncate at base when detached without circlet of white 

 hairs. 



Ilahitat. — The type specimens were from galls collected at 

 Ravinia, 111., from terminal buds on vigorous sprouts from stumps, 

 October 22, 1916, and four living flies cut from the galls November 

 16, 1917, would probably have emerged in the spring of 1918. The 

 galls have also been seen at Bluemont, Va., and Washington, D. C. 

 A similar gall has been observed on Q. stellata at Poplar Bluff, Mo.; 

 Hoxie, Ark.; and College Station, Tex., but not yet reared. 



CALLIRHYTIS MILLERI Weld 



Since describing the species the writer has collected affected acorns 

 on Q. agrlfolla at Ojai (flies emerging April 26), Calistoga, and on 

 Mount Diablo ; on Q. kelloggii at Calistoga, Baird, Milford, Kyburz, 

 Placerville, and in Santa Lucia Mountains; on Q. toisUzenii in the 

 Santa Ana Range, on Mount St. Helena, at Lakeport, Ukiah, Santa 

 Rosa, Shasta, and Red Bluff, Calif. 



CALLIRHYTIS MODESTA (Osten Sacken) 



This hard parenchyma gall on leaves of red oak, Q. maxima., was 

 collected at Ames, Iowa; Moline, 111.; Evanston, 111. (adults emerg- 

 ing June 24, 1912) ; Chesterton, Ind. (containing adults nearly ready 

 to emerge June 25). 



CALLIRHYTIS NIGRAE (Osten Sacken) 



The writer has collected galls of this species on Q. marilandica 

 at Ironton, Mo., Hot Springs and Texarkana, Ark., but never reared 

 adults. 



CALLIRHYTIS OPERATOR (Osten Sacken) 



The acorn pip galls of the agamic generation have been collected 

 at Blue Hills, Mass., and Riverhead (Crosby), N. Y., on Quercus 



G072(5— 2(5 7 



