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Indiana University Studies 



a complete median groove, and a smaller areolet. The larger, 

 more robust gall, of greater diameter, is quite unlike that of 

 diminuens. This latter variety, moreover, is confined to 

 Qiiercus dumosa. 



The Stanford laboratory records state that the single 

 specimen from Cupertino was collected on Q. dumosa, and 

 this specimen is labelled as holotype of kelloggi. If dumosa 

 is the correct host of this specimen it is unlikely that it agrees 

 with the paratypes which came from Douglasii at Paso Robles. 

 The original description, however, agrees with the Paso 

 Robles paratypes, and if it develops that the Cupertino mate- 

 rial does not agree with the description it cannot remain as 

 the holotype. 



Plagiotrichus chrysolepidicola variety diminuens, new variety 



FEMALE. — Shows the following characters in addition to those 

 commcn to all varieties of the species : Color generally rather dark 

 rufous brown, in part blackish; antennae almost entirely brown, the apical 

 half much darker, the first two segments golden rufous; parapsidal 

 grooves distinct for only half or two-thirds of the mesonotal length, 

 moderately convergent posteriorly; median groove practically absent; 

 anterior parallel lines rather distinct; mesopleurae very largely smooth, 

 shining, naked, only centrally punctate, hairy, and limitedly and finely 

 iugose; fovess not large, rather smooth, wholly but not closely rugose 

 at bottom; abdomen bright rufous laterally, distinctly dark rufo-piceous 

 postero-dorsally and postero-ventrally, not very hairy laterally, longer 

 than high; legs including the coxse yellowish rufous, the tibiae distinctly 

 brown ; areolet rather small ; cubitus very faint at the basalis or actually 

 discontinuous; length 1.5-2.5 mm., averaging about 2.0 mm., distinctly 

 smaller than in any other variety. 



GALL. — Differs from the galls of most of the other varieties in 

 being much more slender and elongate, up to 9. mm. in diameter and 70. 

 mm. long, often less in diameter; with the larval cells clustered in a 

 more or less continuous cavity, the cell walls distinct from but attached 

 to the wood. On Quercus dumosa. 



RANGE. — California: Palo Alto, Paso Robles, Pasadena, Santa 

 Catalina Island, Fallbrook, Sorrento, Alpine, Descanso. 



TYPES. — 42 females, 38 galls. Holotype female, paratype females, 

 and galls at The American Museum of Natural History; paratype fe- 

 males and galls at Stanford University, the U.S. National Museum, the 

 Museum of Comparative Zoology, the Philadelphia Academy, and with 

 the author. Labelled Palo Alto, California; March 13, 1920; Q. dumosa; 

 Kinsey collector. 



Insects were emerging at Pasadena on February 7, 1920 ; 

 some emerged after February 23 at Descanso, after February 

 26 at Fallbrook, and after March 7 at Paso Robles. In the 



