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Indiana University Studies 



make an independent group of keUoggi and dimimiens without 

 including alutacetis, which in turn would require the inclusion 

 of all of the varieties as I have treated them. Any arbitrary 

 line drawn for species would be so contrary to facts as to 

 mitigate what convenience might be gained. Up to date I 

 know of few other instances of two related forms occurring in 

 the same faunal area on the same host except where the forms 

 can be considered as belonging to distinct species. But nature 

 does not order things to fit man's taxonomic invention. Here 

 she is evolving two distinct forms which will some day be- 

 come our ''species", just how we cannot understand since 

 there are no isolation factors present; and how to adequately 

 express the situation is beyond a convenient taxonomic 

 scheme. 



Plagiotrichus chrysolepidicola variety alutaceus, new variety 



FEMALE. — Shows the following- characters in addition to those 

 common to all varieties of the species: Color generally a rather light 

 rufous brown; antennae bright rufous brown, the first two segments 

 golden rufous, the apical segments brown; parapsidal grooves entirely 

 indistinct but traceable for most of the mesonotal length, more closely 

 converging posteriorly than in keUoggi; median groove hardly discern- 

 ible except posteriorly; anterior parallel lines rather evident, continuous, 

 smooth; mesopleurse entirely but rather finely punctate, hairy, and 

 rugose, most rugose medianly, in no place as smooth as in keUoggi, 

 rufous brown; foveae large, rather finely separated, entirely, 'sparingly, 

 but rather deeply rugose at bottom; abdomen darker only postero- 

 dorsally and less so ventrally, longer than high; legs including the coxae 

 bright rufous brown, the tibiae and tarsi, especially of the hind legs, dark 

 brown ; areolet of moderate size or moderately large ; cubitus distinct 

 to the basalis; length 2.0-2.7 mm., averaging smaller. 



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

 generally robust, up to 20. mm. in diameter by 40. mm. long, somewhat 

 irregular, smoothly gnarled; internally with a considerable cavity (in 

 the mature gall only) broken by irregular crossed bands of hard wood, 

 and more or less completely filled by clustered, somewhat fused larval 

 cells. On twigs of Querciis dumosa. 



RANGE. — California: Alpine, Sorrento, Fallbrook, El Toro, San 

 Jacinto Mountains, San Bernardino (?), Upland, Pasadena, Santa Cata- 

 lina Island, Paso Robles, Gilroy (Redwood School), Palo Alto. Prob- 

 ably from El Portal and Palo Alto south, wherever Q. dumosa occurs. 



TYPES. — 16 females, 37 galls. Holotype female, paratype females, 

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

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

 with the author; paratype galls at the Museum of Comparative Zoology 

 and the Philadelphia Academy. Labelled Pasadena, California; Febru- 

 ary 7, 1920; Q. dumosa; Kinsey collector. 



