JOUENAL OF ENTOMOLOGY AND ZOOLOGY 133 



two-thirds as broad as long, situated between the posterior pair 

 of coxae. 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 full}' 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 sjiecies 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 Tcnuiala n. gen. 



Mouth-parts rather small; chelicerte, chelate; palpi comijosed 

 of five segments; first very small; second very large, stout; 

 third broad, short; fourth, short; fifth and last segment, long, 

 with prominent setae. Lamellje attached to dorsovertex for 

 their entire length. Translamella absent. Abdomen globose 

 or subglobose. Pteromorphae 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 : T. iiuda n. sp. 



This genus will doubtless include a few previously described 

 species, but none of these appear to have the pteromorphte with 

 such a distinctive shape as this one. The long, narrow, anter- 

 iorly directed, macro-cusp-like ptermorphae which are immovably 

 attached to the abdomen constitute the most distinctive char- 

 acteristic of this genus. 



