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Indiana University Studies 
RANGE. — California: 7 miles southeast of Kelseyville (galls, 
Hildebrand in Kinsey coll.). Lower Lake (in Kinsey coll.). Seigler 
Springs (Q. durata, Hildebrand coll.; types). Scott Valley in Lake 
County ( Q . dumosa, Schulthess in Kinsey coll.). Cobb Mountain in Lake 
County ( Q . durata, Schulthess in Kinsey coll.). Napa County 12 miles 
southeast of Middletown ( Q . durata, galls, Schulthess and Hildebrand 
in Kinsey coll.). North of Beaumont (gall, W. Ebeling in Kinsey coll.). 
Probably confined to Q. dumosa and Q. durata in a limited area of 
California which includes Lake County and northern Napa County; 
possibly extending southward in a narrow rim about the Great Valley. 
Figure 29. 
TYPES. — 2 females and 3 galls in the Kinsey collection. Labelled 
Seigler Springs, California; galls October 1, 1927; insects December 23, 
1927 ; Q. durata; Hildebrand collector. 
This scrub oak (Q. dumosa and Q. durata ) insect is close to 
Weld’s teres which is probably confined to the Oregon oak, Q. 
garryana. In hildebrandae the color is darker brown-rufous, 
especially on the legs and the hypopygium, and the wings are 
distinctly longer than in teres. Hildebrandae and Cynips 
mellea bifurca are the only short-winged cynipids I know 
which show remnants of the venation in the apical half of the 
wing without showing the complete even tho dwarfed vena- 
tion of that area. 
For the past two years Miss Dorothy Hildebrand and Miss 
Pauline Schulthess, both of Kelseyville in Lake County, have 
been finding this scrub oak gall fully matured by the middle 
of September. It probably begins development as early as 
July. A single gall which I have from Q. dumosa in the San 
Bernardino Mountains north of Beaumont was nearly full- 
sized on July 1 (1928), but this specimen may represent a 
variety distinct from, hildebrandae. Insects emerged natu- 
rally from the type galls out-of-doors (at Bloomington, Indi- 
ana) on December 28 (1927). 
I am naming this species for Miss Hildebrand, not only 
because she was the collector of the type material, but also 
in appreciation of the thorough piece of work which she and 
Miss Schulthess have contributed in collecting the entire cyni- 
pid fauna of that interesting and in many ways unique area 
centering in Lake County, California. 
