chamberlin: chilopods from Mexico and west indies. 515 



Nesidiphilus nicaraguae, sp. nov. 



Dorsum light brown, becoming lighter, yellowish, caudad. Head 

 and antennae dilute chestnut of weak ferruginous tinge. Prosternum 

 and prehensors like the head. \^enter yellow to testaceous. Legs 

 testaceous to clear yellow. 



Body moderately robust, conspicuously narrowing caudad from 

 middle but only very gi-adually and moderately narrowed cephalad. 



Cephalic plate about two thirds as wide as long. Sides back of 

 suture nearly straight, slightly converging caudad and rounding in 

 more strongly to a short strongly narrowed caudal portion of head. 

 Frontal suture present. Punctae caudad of suture moderately coarse, 

 not dense. Hairs sparse. Basal plate 3 times wider than long. 



Antennae thick and moderately long. Ultimate article clearly 

 shorter than the two preceding ones taken together. 



Claws of prehensors when closed extending much beyond front 

 margin of head and reacliing to near distal end of second article. Claw 

 armed at base with a stout, distally rounded black tooth. Femuroid 

 with a more robust, distally rounded dark process or tooth projecting 

 cephalomesad, this darker and more strongly chitinized than in the 

 other known species of the genus. 



Prosternum wider than long in the ratio 5:4. Anterior margin 

 between prehensors widely concave; a slight pale tooth on each side. 

 Sides of prosternum parallel between anterior end and the convex 

 caudal corners; 1.76 times longer than greater length of femuroid. 



Prescuta in anterior region short, becoming of moderate length in 

 median region and then again decreasing in caudal region. 



Ventral plates with a distinct transverse sulcus crossed by a 

 median longitudinal one, the impressions deepest at the point of 

 crossing, there being a pit-like depression on this part of anterior 

 plates. 



Last ventral plate narrow; its sides only slightly converging 

 caudad, straight; caudal margin straight. 



Ventral pores numerous; chiefly in two large areas in front of 

 caudal margin and separated by a poreless area along the sulcus; a 

 smaller porose area on each anterior quarter as usual. 



First pair of legs shorter and much more slender than the second, 

 the latter being intermediate in size between the first and the third. 

 Anterior and posterior pairs in general scarcely differing in length or 

 thickness. 



Coxopleurae moderately enlarged; surface densely perforated with 

 very numerous small pores. 



Spiracles all circular; the first one much larger than the third with 

 the second one intermediate in size; the others gradually decreasing 

 caudad as usual. 



