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 orventalis. 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. 
Otocryptors 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; prosternum with anterior margin 
