CHAMBERLIN: CHILOPODS FROM MEXICO AND WEST INDIES. 513 
deep median longitudinal sulcus extending caudad to a sharply im- 
pressed transverse sulcus extending across the plate caudad of the 
middle; farther caudad this median sulcus tends to be replaced by a 
pair of sulci. : 
Last ventral plate narrow but as wide across anterior end as its 
length. Sides straight, strongly converging caudad. Width across 
anterior end nearly twice as great as that across the caudal. Anterior 
margin convex, the caudal weakly incurved. A median longitudinal 
sulcus more or less evident. 
Posterior prescuta short, the anterior ones very short. 
Ventral plates with a median longitudinal furrow which is very deep 
at middle but on some anterior plates may not attain the margins; 
crossed near its middle by a weak transverse furrow. 
Anal tergite broad. Wider than long in ratio 8:7. Sides only 
weakly convex, more abruptly bending in caudad. Caudal margin 
nearly straight. 
Ventral pores in an area on each anterior quarter of sternite and in 
a transverse band across caudal border this band being more or less 
divided at median line by a poreless area. 
Coxopleurae moderate. Pores small and numerous; most dense 
dorsally and ventrally along tergite and sternite, fewer laterally and 
absent from most caudal portion. 
First spiracle much the largest, subcircular or vertically a little 
elongate; all others strictly circular; the second intermediate in size, 
the others decreasing caudad and in the caudal region becoming 
small or very small. ; 
Anal legs exceeding the penult in length though not greatly so. 
In the female slender, the distal articles more slender than the proxi- 
mal. Second tarsal article with a minute vague rudiment of claw. 
Anal legs in male more crassate than in female though not strongly so. 
First legs shorter and much more slender than the second which are 
as large as those immediately succeeding. Posterior pairs longer 
than the anterior ones. | 
Pairs of legs 7 (oc) -49 (@). 
Length 2440 mm. but mostly 30-40 mm. 
Locauiry.— Jamaica: Blue Mountain Peak. Typr, M. C. Z. 
1725; six specimens, Type and Paratypes, M. C. Z. 1749. 
NESIDIPHILUS MONTIS, sp. nov. 
Dusky brown. Head with prosternum and prehensors clearer brown 
of faint reddish cast. Antennae light brown. Legs brownish yellow. 
Body narrowing conspicuously caudad. 
