142 ENTOMOLOGICAL SOCIETY 
Differs from all known Eriophyidae by the prominent median 
black bristle in front; a most remarkable character, and I 
know of no explanation of its use. In some species of Epi- 
trimerus the beak is greatly elongated, but this genus can be 
distinguished at once from Cecidobia by having the dorsal 
rings as numerous as ventral ones. 
Cecidobia salicicola n. sp. 
Dull yellowish. Body broad and short, not three times as long as 
broad at shoulders. Cephalothorax smooth, triangularly produced in 
front, a pair of short porrect bristles in front, and a pair of very large 
and long bristles behind, one near each posterior corner of cephalothorax, 
and each nearly as long as the body; abdomen with about 35 or 40 deep 
FIG. 18. Cecidobia salicicola. 
rings above, extending down but a little way on sides; the telson short; 
apical bristles fully one-half the length of body. Ventral segmentation 
obscure, a few fine lines in certain lights, no "indentations of margin ; four 
pairs of moderately long bristles below; the second and fourth pairs 
longer than others, and the second more widely apart at base; a pair 
of still longer bristles from coxae ii; dorsal tarsal bristle long, and arising 
from base of the joint. 
Length .10 mm. 
Many specimens found in groups of 3 to 10 within recesses 
of a gall on willow from Ward, Colorado (Cockerell) . The gall 
extends above both surfaces of the leaf, yet not very high. 
