210 
Psyche 
[December 
A NEW GALL MITE ON PRUNUS MARITIMA WANG.* 
By James Kendall. 
The examination of a collection of the short stalked, red, 
pouch galls taken on Primus maritima Wang, at Woods Hole 
showed that the mite producing it was not a variety of Eriophyes 
padi Nal. as it has previously been believed. It differs from 
Eriophyes padi Nal., the producer of a pouch gall on the leaves 
of Prunus padus L., in that it is larger, has a pair of accessory 
setae, and has a greater number of striae. Schoene (1907) cites 
the difference of Eriophyes pruni Schoene, the mite producing a 
pouch gall on Prunus americana L., from Eriophyes padi Nal., 
which it was supposed to have been, by the possession of a pair 
of accessory setae. Unfortunately, Schoene has not published a 
description of the mite which he refers to his manuscript of 1907. 
The mite which occurs on Prunus maritima may be a closely re- 
lated form of the mite which Schoene refers to under the name 
of Eriophyes pruni Scjioene. Until extensive collections of the 
genus Eriophyes occuring in America are made and preserved 
with some degree of permanence, it is necessary to consider many 
forms as distinct species which may later be considered 
subspecies and varieties of a certain designated type species. 
Such a process must occur slowly, even as it has in Europe under 
the guidance of Dr. Alfred Nalepa. The description of the mite 
producing the gall on Prunus maritima Wang, will be given under 
the name of Eriophyes maritima and considered as a new species. 
(%• i-) 
Eriohpyes maritima n. sp. 
Body cylindrical; thoracic shield with median longitudinal 
ridges on the dorsum and does not project over the rostrum, 
which is relatively very short and curves slightly downward. 
Tubercles of dorsal setae near posterior border of shield and far- 
ther apart than the length of the setae which incline toward each 
Contribution from the Entomological Laboratory of the Bussey Institu- 
tion, Harvard University, No. 306. 
