chamberlin: chilopods from Mexico and west indies. 529 



Palpus of first maxillae large; consisting of two distinctly separated 

 joints, of which the distal one is large and subconical and the proximal 

 one bears ectodistally a very short membranous appendage or dwarfed 

 lappet. Inner branch rather large, not separated from coxa by a 

 suture; a deep incision separating it from its mate. Coxae fused 

 proximally. 



Prehensors small; wholly unarmed. Claws slender; when closed 

 not extending beyond front margin of head. 



Prosternum unarmed. Chitinous lines strongly developed. 



Ventral pores present in a transverse area a little caudad of middle, 

 the band leading to be divided at middle on the more caudal sternites. 



Last ventral plate wide. 



Coxopleural pores small; few. 



Anal legs consisting of six joints distad of the coxopleura, the last of 

 which bears a well-developed claw. First tarsal joint abruptly 

 smaller than the preceding one and the second tarsal joint abruptly 

 much smaller than the first, the latter being somewhat intermediate 

 in size. 



Genotype. — L. carriheanus, sp. nov. 



Evidently closely related to Erithophilus but differing especially 

 in the structure of the first maxillae in which the palpus is large with 

 both joints distinctly separated and not reduced and fused at base 

 with coxa and laterally with the inner process. In Erithophilus the 

 two tarsal joints are equally slender whereas in the present genus the 

 first joint is conspicuously thicker than the second (Plate 3, fig. 6). 



Leptophilus carribeanus, sp. nov. 



Entire body with legs, antennae, and frontal region of head yellow. 

 Head darker over posterior portion. 



Body slender; of nearly uniform width throughout, being only 

 slightly narrowed caudad. 



Caudal margin of head widely incurved; anterior margin truncate 

 or slightly angulate at middle. Head widest caudad, the sides being 

 convex and moderately converging cephalad. Equal in length and 

 breadth. Exposing prehensors at sides. Prebasal plate slightly ex- 

 posed. Basal plate large; very wide; sides convex, moderately con- 

 verging cephalad. Slightly more than twice as wide as long. 



Antennae long and slender; filiform, scarcely narrowing distad; 

 4.5 times longer than the head. 



Prehensors small. Claws small and slender, when closed not 

 attaining the front margin of the head. Prehensors wholly unarmed. 



