Neuroterus quercicola variety congregatus bisexual form

GALL. — Typical for the species ; described as a terminal twig swelling, 6.-8. mm. in diameter, with larval cells developing within the bud, and covered with a pubescence; or merely larval cells buried in the twig; on Quercus (Gambelii?) .

RANGE. — Colorado: Manitou (Gillette). Probably confined to a limited area of the foothills east of the Continental Divide.

Gillette's insects were taken at Manitou, Colorado, emerging from May 8 to 17 ; they were all males. The host was not named, but it was probably Quercus Gambelii, which is the common oak about Manitou. Not only stems and buds, but also flowers and leaves should be involved in the galls of this bisexual form. Gillette compared his galls to those of N. vesicula, but the two are very different. There is no question of the relation of congregatus to the Pacific Coast varieties of the species. The male of this variety is the darkest in the species, furnishing another instance of the melanism common at Manitou.

- Alfred Kinsey: (1923) The Gall Wasp Genus Neuroterus^©

Reference: https://www.biodiversitylibrary.org/page/53512324#page/363/mode/1up