chamberlin: the chilopoda of brazil. 161 



sulcate. The sulci of the second and third as well as of the others 

 entirely crossing the plate. A ridge-like elevation or keel between 

 the sulci. Plates longitudinally depressed on each side between the 

 sulcus and the lateral margin. (Plate 1, fig. 6). Last dorsal plate 

 margined. Bowed out caudad with the mesal part truncate, the 

 margin on each side of truncation slightly incurved and extending ob- 

 liquely to the lateral margin. The two longitudinal sulci also evident 

 on this plate excepting at caudal end. 



Second to nineteenth ventral plates longitudinally bisulcate. First 

 plate with a median longitudinal furrow. Especially the more poste- 

 rior plates longitudinally broadly depressed each side of the middle. 

 Last ventral plate strongly narrowed caudad, though less strongly 

 so than in orientalis. Caudal margin straight or but slightly excurved; 

 corners rounded. 



Coxopleurae extended caudad in a conical process which is stouter 

 and less cylindric than in orinitalis. Pores small and numerous. 

 (Plate 1, fig. 7). 



Tarsi of all legs distinctly biarticulate. Anal legs of form very 

 similar to that of orientalis. Prefemur with a low dorsal elevation at 

 distal end. Claw much shorter than tarsus. 



Length 10.5 mm. 



Locality. — State of Rio de Janeiro: Rio de Janeiro. Nathaniel 

 Thayer expedition. 1864. M. C. Z. 



Because of long preservation the two specimens are bleached and 

 almost wholly bereft of hairs and spinules; accordingly, no attempt is 

 made to describe their presence and characteristics. Mimops orien- 

 talis Kraepelin, the other species of the genus, is from Shensi, China. 

 It is a much larger form and differs in numerous structural details 

 from the present species. 



Otocryptops Haase. 



Abhandl. Mus. Dresden, 1887, 5, p. 96. 



Scolopocryptops Newport (in part). Trans. Linn. soc. London, 1844;, 19, p. 405. 



Meinert (ad part, max.), Proc. Amer. philos. soc, 1886, 23, p. 179. 

 Otocryptops Kraepelin, Revis. Scolop. 1903, p. 68. Verhoeff, Bronn's Thier- 



reich, 1907, 5, p. 255. 



Key to species. 



a. Twentieth, and often also the twenty-first, legs with a spine 

 both on tibia and on tarsus; presternum with anterior margin 



