120 



Indiana University Studies 



of the variety, and invite further data from other workers the 

 sooner. 



Plagiotrichus chrysolepidicola variety pugnus, new variety 



FEMALE. — Shows the following characters in addition to those 

 common to all varieties of the species: Color generally dark rufous or 

 chestnut brown and black; antennas almost entirely brown, the first 

 two segments rufous, the terminal segments darker brown; parapsidal 

 grooves distinct, narrow, but slightly broader and smoother at bottom 

 than in other varieties, practically obsolete for the anterior half or third 

 of the mesonotum; a short median groove just evident; anterior parallel 

 lines not entirely smooth; mesopleurae rufous, largely smooth and naked 

 beneath the tegulse, medianly finely rugoso-punctate and hairy; foveas of 

 moderate size, smooth and shining, very sparingly rugose at bottom; 

 abdomen in part rufous, banded rufous brown about the edges of the 

 second and third segments, and generally dorsally and ventrally, not 

 as long as high; legs brownish rufous, the bases of the coxae, the tibiae, 

 and tarsi brownish, the hind tibiae dark brown; first abscissa of the 

 radius rather broadly infuscated at the subcosta; areolet of moderate 

 size or moderately small; cubitus about continuous; length 2.2-2.8 mm. 



GALL. — Similar to the galls of other varieties of the species; more 

 irregular in shape, knotted, sometimes rather fist-like, up to 25. mm. 

 in diameter by 40. mm. long; internally solid, woody, the larval cells 

 closely embedded; on Quercus lohata. 



RANGE. — California: Three Rivers, Exeter. Probably confined to 

 the more southern range of Quercus lohata. 



TYPES. — 7 females, 19 galls. Holotype female, paratype galls at 

 The American Museum of Natural History; paratype females and galls 

 at the U.S. National Museum, Stanford University, and with the author. 

 Labelled Exeter, California; March 22, 1920; Kinsey collector. 



Most of the insects had emerged before the date of col- 

 lecting at Exeter on March 22, 1920. 



This variety, in both insect and gall characters, much more 

 closely resembles pugnoides than any other variety of the 

 species. Pugrius is to be distinguished by the rufous meso- 

 pleurae, the smaller areolet, and generally smaller size. Both 

 insects occur on the same oak, lohata, but as far as collected 

 pugnus appears to be more southern than pugnoides. The 

 variety next most closely related to these two is gamjanx, 

 occurring still further north on Quercus garryana. 



Plagiotrichus chrysolepidicola variety pugnoides, new variety 



FEMALE. — Shows the following characters in addition to those 

 common to all varieties of the species: Color generally dark rufous or 

 chestnut brown and black; antennas almost entirely brown, the first two 

 segments rufous, the terminal segments darker brown ; parapsidal 



