24 



Indiana University Studies 



MALE. — Shows the secondary sexual characteristics of the species 

 but further agrees with the female of this variety, 



GALL. — Similar to galls of the bisexual generations of the other 

 varieties. On Quercus marylandica, Q. coccinea, and possibly other 

 black oaks. 



RANGE. — Virginia: Rosslyn. D.C.: Washington (Osten Sacken). 

 New York; Sullivan County (Beutenmuller collector). Connecticut: 

 Waterbury (Bassett). Possibly thruout a more northern area of east- 

 ern United States except in more northern New England and on the 

 Atlantic Coastal Plain. 



TYPES. — Females, males, and galls in the Museum of Comparative 

 Zoology; a male in my collection. Washington, D.C.; Q. marylaiidica ; 

 Osten Sacken collector. 



This variety is closely related to varieties falsus and co?i- 

 sohrimis, from which this insect is to be distinguished by 

 the distinctly broadened parapsidal grooves, the sculptured 

 fovese, and the distinctly larger size. 



Osten Sacken originally described operator from Q. mary- 

 landica {=Q. nigra Gray, Ed. 6, not Linnseus). I have it 

 from marylandica at Rosslyn, Virginia, altho most of the 

 insects from that host are consobrinus. Insects I bred from 

 galls of Q. coccinea at Rosslyn, material from an unidentified 

 host in Sullivan County, New York, and Bassett material pur- 

 porting to be from Q. ilicifolia near Waterbury, Connecticut, 

 are quite uniformly of this variety. Apparently it occurs on 

 several of the black oaks, without coincident, constant vari- 

 ations. In regard to coloration, material from each host may 

 average rather differently, but I cannot discover good struc- 

 tural characters to separate host varieties. The distribution 

 appears to be broad, over a part of eastern United States, 

 but we need more data to determine the exact range. I have 

 not seen it from more northern New England, from the 

 Atlantic Coastal Plain, nor from Texas, altho other varieties 

 occur in those places. Its occurrence at Rossljm, Virginia, 

 in the same locality with consobrinus, may indicate a limit 

 of its range. The British Columbia record of Dalla Torre 

 and Kieffer originated in their customary, mistaken inter- 

 pretation of ''D.C." The Bassett material, unfortunately, is 

 not of certain locality or host, for Bassett did not definitely 

 label most of his material and sometimes put into a single box 

 unmounted material from several sources. Whether the ope?-- 

 ator material I have seen is the same as Bassett had when 



