22 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 63, 



a fringe of long, conspicuous setae. Treatment with potassium 

 hydroxide shows that the abdomen is provided with poorly chiti- 

 nized pleural plates; typically, one of these is narrow at its anterior 

 end where the spiracle is situated and expanded and truncate at its 

 posterior end, at which end is situated the large lateral hair. Ante- 

 rior pair of legs much smaller than the others; second segment of 

 tarsus I longer than usual and apparently forming a part of the 

 tarsal claw; tarsal claw proper reduced and shortened. Femora 

 II and III stout, each with a very large tenaculum; segment I of 

 te.rsus III as broad as long and forming with segment II and the 



tarsal claw, the large claw- 

 like tarsus itself; at the base 

 of segment II on the inside 

 is a seta. 



Length, 1.34 mm.; width, 

 0.58 mm. 



Type Jiost and type local- 

 ity. — Kerodon moco from 

 Para, Brazil. 



Description based on a 

 female specimen on male 

 skin of Proechiiiiys mincae 

 (Cat. No. 123490, U.S.N.M.) 

 from Manzanares, Colombia. 

 A 3'Oung specimen taken on 

 female skin of Kerodon 

 australis (Cat. No. 84177, 

 U.S.N.M.), from Upper Rio Chico, Santa Cruz, Argentina. Neu- 

 mann described this species from some specimens taken on Kerodon 

 moco^ from Para, Brazil, by Goeldi. 



TETRAGYROPUS SETIFER. new species. 



Text fig. 10. 



A medium-sized, rather stout species. Temporal lobes without 

 lateral angles ; antennal fossae deep, each with inner border concave 

 throughout. Antennae of the usual shape, last segment longer than 

 broad, conspicuously scaled, and witli a deep emargination on the 

 outside. Palpi with the four segments very distinct; third segment 

 almost as broad as first and nearl}' twice as broad as fourth segment ; 

 fourth, or last, segment slightly longer than broad and bearing 

 several setae at its tip. Below, on the temporal region, the head 

 bears on either side two approximate long setae and above a trans- 

 verse row of six large dorsal setae, the outer pair being situated about 

 twice as far from the middle pair as the inner pair. Prothorax 

 three-fourths as broad as head, sides rounded toward the front and 



Fig. 10. — Tetragyeopus sktifer. Ventral view 

 of base of femur iii. 



