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Indiana University Studies 



Kelloggii ranges over more than one faunal area, so perhaps 

 only the Oregon records apply to this variety. I have seen 

 the insects only from Ashland, Oregon, 



Plagiotrichus perdens variety destructor, new variety 



FEMALE. — Differs from the female of the other variety only in 

 having the fovese very much wider, continuous with a smooth area an- 

 teriorly, and in averaging somewhat smaller, up to 2.5 mm. in length. 



GALL. — Differs from the gall of the other variety only in having 

 the bark smooth, the splitting less ragged, less extensive. On Querciis 

 Wislizenii. 



RANGE.— California: San Bernardino (?), Three Pvivers, Gilroy, 

 (Redwood School), Oakdale, Boulder Creek, Mt. Tamalpais, Placerville, 

 Ukiah. Very probably more than one variety is represented by these 

 localities. 



TYPES. — 4 females, 40 galls. Holotype female, paratype galls at 

 The American Museum of Natural History; paratype adults and galls 

 with the author; paratype galls at the U.S. National Museum, Stanford 

 University, and the Museum of Comparative Zoology. Labelled Boulder 

 Creek, California; April 11, 1920; Q. Wislizenii; Kinsey collector. 



At the time of publishing perdens it was noted that a ''very 

 similar if not specifically identical gall is found on Querciis 

 Wislizeni'\ The insects from Wislizenii at Boulder Creek do 

 not agree v/ith the Ashland, Oregon insects from Q. Kelloggii 

 in regard to the few characters described. Whether the dif- 

 ferences are due to the different hosts, or to differences in 

 distribution, or to both, I cannot say, for I have insects from 

 only the two localities. Probably the varieties are restricted 

 each to a single host, and each to a single faunal area, as is 

 the case with the other California species of this genus. 



Plagiotrichus suttonii (Bassett) 



FEMALE. — Shows the following characters in addition to those 

 common to all agamic forms of the genus : Color generally bright rufous 

 to brown and black; antennae with 15 seg-ments, brownish black, only the 

 first two segments lighter; whole mesonotum relatively smooth, not 

 closely punctured, very sparsely hairy; parapsidal grooves rather dis- 

 tinct for half the mesonotal length, hardly discernible anteriorly, not 

 very convergent posteriorly; median groove entirely lacking; anterior 

 parallel lines posteriorly rather broad and distinct; lateral lines in a 

 very broad, smooth, naked area; mesopleuras in part dorsally smooth 

 and naked, elsewhere sparsely and finely puncto-rugose and at least in 

 part hairy; scutellum quite rugose and hairy; foveas rather large, broad, 

 separated by only a fine ridge, largely smooth, sparsely rugose at the 

 bottom; abdomen brilliant brownish rufous, solid black dorso-basally ; 



