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 (cr)-49 (9). 



Length 24-40 mm. but mostly 30-40 mm. 



Locality.— Jamaica: Blue Mountain Peak. Type, 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 niirrowing conspicuously caudad. 



