PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 82 



TROMBICULA CAVERNARUM, new species 



Figure 2 



Adult, — Moderate in size and of the shape typical of the genus. 

 No capituhnn present. Palpi reaching beyond the middle of the first 

 patellae; palpal claw weak, but little over half as long as the arched 

 segment which bears it; accessory spines four, subequal, forming a 



comb ; palpal thumb 

 slightly swollen and 

 extending to middle 

 of palpal claw. Che- 

 licerae very slender ; 

 chelae slender, sharp, 

 tips extending slight- 

 ly beyond the tips of 

 second palpal seg- 

 ments. Crista rodlike, 

 expanded near its 

 posterior end into a 

 d i a m o n d-s h a p e d 

 pseudostigmatic area 

 slightly beyond which 

 the crista ends in two 

 strongly diverging 

 lateral ai'ms. Pseu- 

 clostigmata moderate, 

 situated near lateral 

 angles of pseudostig- 

 matic area ; pseudo- 

 stigmatic organs very 

 long, setiform, with 

 tvfo barbs. Eyes ab- 

 sent. Abdomen about 

 one and a half times 

 as long as broad; 

 setae short for the 

 genus. Genital open- 

 ing about one half of its diameter from posterior coxae. Genital 

 armature of male composed of a basal plate, a protruding penis, and 

 an inwardly projecting manubrium; basal plate horseshoe-shaped; 

 penis a cone-shaped, sclerotized structure, situated between the two 

 arms of the basal plate ; manubrium somewhat longer than penis and 

 arising from base of the same. Anus somewhat smaller than genital 

 opening and situated about one and a half times its greatest diameter 

 behind the same. Anterior legs only slightly larger than posterior. 



Figure 2. — Ventral view of male of TromMcula caverna- 

 runi, new species. (Drawn by Eleanor A. Carlin.) 



