296 
Psyche 
[December 
DESCRIPTIONS OF FOUR NEW FORMS OF 
ERIOPHYES. 1 
By James Kendall 
Bussey Institution, Harvard University. 
Preliminary to a study of four Eriophyid galls occurring 
very commonly in Massachusetts, New York, and New Jer- 
sey, it was necessary to determine the taxonomic position of 
the causative parasites. As a result of examinations of many 
specimens from each gall collected over a period of several 
months these mites were determined to be new forms of 
Eriophyes and a detailed description was made to indicate 
the relationship of each of these forms. Comparisons with 
already known and described species are given in the case 
of each mite hereafter described, together with a figure 
showing the more characteristic distinguishing features. 
The material from which the present data were taken 
was collected primarily in the Arnold Arboretum, Forest 
Hills, Mass. ; additional material was collected from south- 
ern New York and northern New Jersey. The mites and the 
host or hosts with which each is associated are as follows : 
Eriophyes celtis, sp. n. on Celtis occidentalis L. and Celtis 
occidentalis canina; Eriophyes rudis dissimilis, subsp. n. on 
Betula lutea Michx. f. ; Eriophyes eucricotes multistriatus , 
var. n. on Lycium halimifolium Mill. ; and Eriophyes fraxi- 
nivorus americanus, var. n. on Fraxinus americana L. 
The taxonomy of the Eriophyidse has been and still is a 
problem. The rules for the systematic separation of the 
forms have been given in some detail by Nalepa (1924) but 
have been the source of disagreement between himself and 
Cotte (1925). Part of the trouble hinges on the question of 
the importance of physiological differences. What status 
iContributions from the Entomological Laboratory of the Bussey Institu- 
tion, Harvard University, No. 325. 
