JOURNAL OF ENTOMOLOGY AND ZOOLOGY 133 
two-thirds as broad as long, situated between the posterior pair 
of coxe. Anal covers larger than the genital covers, about 
twice as broad posteriorly as anteriorly, and situated about 
one and a half times their length from the genital covers. Legs 
moderate; anterior pair reaching beyond the tip of the cephalo- 
thorax by fully one-half their length; posterior pair reaching 
slightly beyond the posterior margin of the abdomen. Ungues 
tridactyle, dactyles subequal. Total length of the body, 0.58 
mm.; width 0.40 mm. 
From Corvallis, Oregon; shaken from Douglas fir; by the 
writer. 
Of the seven specimens which I have of this species six are 
females. This species is peculiar on account of the prominent 
tuberosities on the posterior part of the abdomen, hence its 
name, tuberosa. 
Genus T'enwiala n. gen. 
Mouth-parts rather small; chelicere, chelate; palpi composed 
of five segments; first very small; second very large, stout; 
third broad, short; fourth, short; fifth and last segment, long, 
with prominent sete. Lamelle attached to dorsovertex for 
their entire length. Translamella absent. Abdomen globose 
or subglobose. Pteromorphe not hinged to abdomen; composed 
of a single large, long, cusp-like expansion which extends for- 
ward almost to the tip of the cephalo-thorax. Genital and anal 
openings widely separated. Legs moderate; ungues, tridactyle; 
dactyles subequal. 
Type species: 7. nuda n. sp. 
This genus will doubtless include a few previously described 
species, but none of these appear to have the pteromorphe with 
such a distinctive shape as this one. The long, narrow, anter- 
iorly directed, macro-cusp-like ptermorphe which are immovably 
attached to the abdomen constitute the most distinctive char- 
acteristic of this genus. 
