Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Species Andricus bakkeri


Review of the world genera of oak cynipid wasps (Hymenoptera: Cynipidae, Cynipini)
By George Melika and Warren G. Abrahamson
Parasitic Wasps Evolution Systematics Biodiversity and Biological Control 42(1):150-190, 2002

Notes on cynipid wasps, with descriptions of new North American species
By Lewis H. Weld
Proceedings of the United States National Museum, Vol. 61, Art. 18, 1922

Phylogeny, Evolution and Classification of Gall Wasps: The Plot Thickens
By Ronquist F, Nieves-Aldrey J-L, Buffington ML, Liu Z, Liljeblad J, Nylander JAA
PLoS ONE 10(5): e0123301, 2015
doi:10.1371/journal.pone.0123301

full text

Monograph on the Gall-Making Cynipidae (Cynipinae) of California
By David T, Fullaway
The Entomological Society of America, 1911
Full text can be read online or downloaded as a PDF...for free...from either of the links below:

Biodiversity Heritage Library

Google Books

Key to American Insect Galls
By Ephraim Porter Felt
New York State Museum Bulletin, No. 200. , 1917
Freely available at this Google Books link.

Although quite old, and likely with much out-of-date nomenclature...this reference has a large number of useful line drawings and photos (including 16 plates w/ 9 photos each = 144 photos at the end). The name of this work is rather misleading...as there's no "key" per se. Instead, the galls are organized by plant families of their hosts, listed there with (usually very) brief comments on rearing records, perhaps some minimal descriptive info, and abbreviated bibliographic references.

California Gall-Making Cynipidae (with Descriptions of New Species)
By Isabel McCracken & Dorothy Egbert
Stanford University Publications, 1922
The full text of this reference can be read online, or downloaded as a PDF...for free...at either of the following links:

Biodiversity Heritage Library

Google Books

American gallflies of the family Cynipidae producing subterranean galls on oak
By Lewis Hart Weld

Plant Galls and Gall Makers
By Ephraim Porter Felt
Comstock Publishing Company, Inc., Ithaca NY, 1940