300 
Psyche 
[December 
ficult, if not impossible at times, to determine the dorsal 
and ventral characters accurately. 
An easier and quicker method that gives better tem- 
porary mounts for studying the specimens to be described 
and for checking the characters of specimens mounted in 
celloidin, is the iron-acetocarmine method of Belling (1926), 
which is used widely in cytology for studying pollen mother 
cells. Large numbers of mites and their eggs can be dis- 
lodged by dipping small pieces of the galls into a drop or 
two of this stain placed in the center of a slide. This must 
be done rapidly and a cover glass placed on immediately to 
prevent evaporation of the stain. The mites are fixed with- 
out distortion and only sufficient of the stain enters the 
body, unless the mite has been crushed during removal from 
the gall to the slide, to make the contents distinguishable. If 
the cover glasses are sealed on by several applications of 
gold size, e'uparal, or balsam, it is possible to keep such 
mounts a reasonably long period. They have the advantage 
of being very thin and specimens are spread out to display 
the ventral and dorsal aspects in most cases, rather than 
the lateral aspects presented in the celloidin mounts. The 
darker background of the stain together with the slight 
internal staining of the body makes it easier to distinguish 
many of the morphological characters. Neutral red may be 
used with much the same result as the acetocarmine. The 
advantages of these mounts are counterbalanced by their 
fragility and probable lack of permanence, though speci- 
mens mounted in this manner have been kept for a year in 
a state of good preservation. 
Eriophyes celtis, sp. n. 
Hosts : Celtis occidentalis L., Celtis occidentalis canina. 
In 1903 Di Corti described a mite, Eriophyes bezzii, from 
specimens found in colonies in deformed buds of Celtis aus- 
tralis L. The gall resulting from the parasitism of these 
mites is limited, according to his descriptions, to the arrest- 
ing of the buds and their subsequent swelling. In the north- 
eastern United States there is a common gall consisting of a 
bud deformation associated with a witch’s broom develop- 
