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Indiana University Studies 



lum somewhat more elongate, basal furrow rather wider; length 2,5-3.0 

 mm. 



GALL. — Differs from the gall of variety asymmetricus in having 

 almost the entire swelling compactly filled with larval cells, the swelling 

 more symmetrical; observed up to 3.0 mm. long, probably often longer; 

 the outer bark often splits and in part breaks away. On stems of 

 Quercus chi^ysolepis. 



RANGE. — California: Placerville, Dunsmuir. Probably confined 

 to the central Sierras, north of El Portal, at the elevations at which Q. 

 chrysolepis occurs. 



TYPES. — 8 females, 7 galls. Holotype female, paratype female,- 

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

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

 with the author. Labelled Placerville, California; March 30, 1920; 

 Kinsey collector. 



Insects emerged from these galls sometime after the date 

 of collecting at Placerville, March 30. 



The adults do not appear to differ from variety asym- 

 metricus except in color and size characters. But inasmuch 

 as the galls of the two are distinct, and the varieties occur in 

 distinct tho related faunal areas we are warranted in rec- 

 ognizing the differences. 



Plagiotrichus asymmetricus variety compactus, new variety 



FEMALE. — Differs from the female of the other two varieties as 

 follows: Head still lighter brownish rufous, more finely sculptured; 

 areolet of moderate size, much smaller than in the other two varieties; 

 antennae light yellow brown, more yellow basally; thorax almost wholly 

 clear brownish rufous; mesonotum very largely smooth and shining, 

 faintly coriaceous anteriorly, with very faint striae from the midpoint 

 of the posterior margin; parapsidal grooves, median, anterior parallel, 

 and lateral lines hardly at all indicated; scutellum wholly rufous brown, 

 more finely rugose than in other varieties; the arcuate furrow at the 

 base of the scutellum more nearly divided into two than in other 

 varieties; pronotum wholly rufous brown; mesopleurae largely smooth 

 and shining, in only a small part aciculate; abdomen dark brown or 

 brown black; wing veins of moderate weight, light brown; areolet of 

 moderate size only; length 1.7-2.0 mm., smaller than in other varieties. 



GALL. — Practically identical with that of variety annectens. On 

 stems of Quercus chrysolepis. 



RANGE. — California: El Portal, Pasadena. Probably occurs 

 thruout the southern Sierras, from El Portal to the Sierra Madre and 

 San Jacinto mountains, except in the San Bernardino range. 



TYPES. — 8 females, 14 galls. Holotype female, paratype female, 

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

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

 with the author. 



