Kinsey: Gall Wasp Genus Cynips 393 
origin (see the discussion under erinaeei , p. 398), and thruout 
that region derivatus may occasionally appear as a segregate 
from the hybrid stock. This is true at least as far north as 
Meadville, in the corner of western Pennsylvania which fronts 
on Lake Erie. The series of 107 insects which I have from 
that locality vary from wheeleri thru true erinaeei to true 
derivatus , with 41 per cent of these insects clearly derivatus. 
The characteristic gall of derivatus is rarely found north of 
southern Indiana or West Virginia, becoming submerged in 
the spiny to smooth galls of the hybrid series erinaeei. 
Mature galls of this variety were collected as early as Sep- 
tember 9 (1927 at Eddyville, Illinois) and September 11 (1926 
at Bedford, Indiana) . Emergence dates which I have for this 
insect are November 12, 18, 20, 24, and 25 ; December 4, 5, 3, 
9, 10, 14, 15, 18, 19, 21, 22, 24, and 31 ; and January 3. 
Cynips pezomachoides variety erinaeei 
(— C. pezomachoides wheeleri x derivatus?) 
agamic form erinaeei (Beutenmtiller) 
Figures 3, 4, 68, 312-315, 328, 331, 348, 352, 420 
Gall q. erinaeei Walsh, 1864, Proc. Ent. Soc. Phila. 2:483 [gall only]. 
Q. erinaceus Walsh, 1870, Amer. Ent. and Bot. 2: 299, 301. 
Acraspis erinaeei Mayr, 1881, Gen. gallenbew. Cynip. : 30 [no descrip- 
tion]. Bassett, 1882, Amer. Nat. 16: 246. Ashmead, 1885, Trans. 
Amer. Ent. Soc. 12 : 295. Ashmead, 1887, Trans. Amer. Ent. Soc. 
14: 128, 140. Cresson, 1887, Trans. Amer. Ent. Soc. 14: suppl. 178. 
Ashmead, 1888, Kans. Agric. Exp. Sta. Bull. 3: IV. Gillette, 1888, 
Rpt. Agric. Mich. 26:470. Gillette, 1889, Psyche 5:186. Ash- 
mead in Packard, 1890, 5th Rpt. U.S. Ent. Comm.: 106. Gillette, 
1892, Proc. Iowa Acad. Sci. 1 (2) : 112. Beutenmiiller, 1892, Bull. 
Amer. Mus. Nat. Hist. 4: 259, pi. 12 fig. 1. Dalla Torre, 1893, Cat. 
Hymen. 2: 64. Gillette, 1896, Trans. Amer. Ent. Soc. 23: 94. Bride- 
well, 1899, Trans. Kans. Acad. Sci. 16 : 203. Dalla Torre and Kief- 
fer, 1902, Gen. Ins. Hymen. Cynip.: 58. Cook, 1904, Ohio Nat. 
4: 142, fig. 125. Cook, 1905, Rpt. Dept. Geol. & Nat. Res. Ind. 
29: 832, fig. 25. Felt, 1906, Ins. Aff. Pk. & Woodl. Trees 2: 619, 
627. Jarvis, 1907, Rpt. Ent. Soc. Ont. 37:70. Cook, 1910, Mich. 
Geol. & Biol. Surv. Publ. 1 : 28. Baldwin, 1914, Rpt. State Ent. 
Ind. 6: 55. Thompson, 1915 (not all localities), Amer. Ins. Galls: 
15, 35. Fagan, 1918, Amer. Nat. 52: 157. Lutz, 1918, Fieldbook 
Ins.: 462, pi. 97 fig. 4. Felt, 1921, N.Y. Mus. Bull. 231-232:73. 
Weld, 1926 (in part), Proc. U.S. Nat. Mus. 68 (10): 57. Well- 
house, 1926 (agamic form only), How Ins. Live: 316-321, fig. 143. 
