Kwsey: Studies of Cynipidm 



28 



ties. I have material representing some further varieties, but 

 it is not sufficient to warrant description now. Probably sev- 

 eral other varieties remain to be described, particularly from 

 more southern regions of North America. 



Overator does not belong to the genus Andricus in its 

 true limitations. Operator has unique generic characters 

 which I have not yet recognized in any other species. Until 

 a complete revision of cynipid genera can be given, it is not 

 desirable to introduce a new genus for this species. 



Andricus operator variety operator 

 form operator (Osten Sacken) 



Cynips quercus operator Osten Sacken, 1862, Proc. Ent. Soc. Phila., I, 

 p. 256. 



Cynips q. operator Bassett, 1863, Proc. Ent. Soc. Phila., II, p. 332; 1864, 

 Proc. Ent. Soc. Phila., Ill, pp. 197, 198; 1873, Can. Ent., V, pp. 91, 

 93, 94; 1877, Can. Ent., IX, p. 121. Pviley, 1873, Amer. Nat., VII, 

 p. 519. Howard, 1882, Psyche, III, p. 329. Packard, 1890, 5th Rpt. 

 U.S. Ent. Comm., p. 11. 



Cynip>s operator Osten Sacken, 1865, Proc. Ent. Soc. Phila., IV, pp. 341, 

 346, 350, 357. 



[No name] Bassett, 1880, Can. Ent., XII, p. 170. 



Andricus (Callirhytis) operator Mayr, 1881, Gen. Gallenbew. Cynip., 

 p. 28. Bassett, 1882, Amer. Nat., XVI, p. 246. Ashmead, 1885, 

 Trans. Amer. Ent. Soc, XII, p. 294. Ashmead (in Packard), 1890, 

 5th Rpt. U.S. Ent. Comm., p. 105. Viereck, 1916, Hymen. Conn., 

 p. 429. 



Callirhytis operator Ashmead, 1885, Trans. Amer. Ent. Soc, XII, p. 304; 



1887, Trans. Amer. Ent. Soc, XIV, p. 131. Ashmead (in Packard), 



1890, 5th Rpt. U.S. Ent. Comm., p. 110. Riley, 1895, Sci., I, p. 463. 



Dalla Torre and Kieffer, 1902, Gen. Ins. Hymen. Cynip., p. 66. 



Thompson, 1915 (0. S. record), Amer. Ins. Galls, pp. 11, 30. Felt, 



1918, N.Y. Mus. Bull., 200, p. 72. 

 Andricus operator Dalla Torre, 1893, Cat. Hymen., II, p. 92. Bassett, 



1900, Trans. Amer. Ent. Soc, XXVI, p. 315. Felt, 1906, Ins. Aff. 



Pk. and Woodl. Trees, II, pp. 618, 622, 713. Britton, 1920, Conn. 



Geol. and Nat. Hist. Surv. Bull., 31, p. 321. 

 Callirhytis quercus-operator Dalla Torre and Kieffer, 1910, Das Tier- 



reich, XXIV, pp. 582, 798, 830. 



FEMALE. — Differs from the bisexual females of the other varieties 

 of the species as follows : Head and thorax bright brownish rufous, 

 face yellow rufous, antennse mostly yellow rufous, slightly darker ter- 

 minally, parapsidal grooves distinctly wide posteriorly, not quite smooth 

 at bottom, convergent posteriorly; foveas quite broad, entirely rugose at 

 bottom; mesopleuras distinctly aciculate centrally; abdomen usually 

 bright rufous basally; length 1.5-2.7 mm. 



