CHAMBERLIN: CHILOPODS from MEXICO AND WEST INDIES. 511 



CHILENOPHILIDAE. . 



NESIDIPHILUS, gen. nov. 



Head with frontal plate usually not set of? by distinct suture 

 but this sometimes present or indicated by a pale line. Basal plate 

 wide; trapeziform; overlapped by the cephalic plate. Dorsal plates 

 bisulcate. 



Antennae filiform, short. 



Labrum free; tripartite. The median piece large; bearing along 

 the caudal margin a series of long stout teeth of which the median 

 ones are largest. Lateral pieces fringed with paler, distally more 

 slender, spinescent processes. 



Second maxillae with coxae completely united at middle, the isthmus 

 moderately wide cephalocaudally and as well chitinized as the more 

 lateral portions. Pleurosternal sutures strongly developed. The 

 sclerite ordinarily appearing at caudal angles of inconspicuous size 

 is in this genus large and extended cephalomesad parallel with suture, 

 being separated caudally by a narrow slit but elsewhere united with 

 portion of plate adjoining the suture. From between the anterior 

 ends of these inner sclerites extends cephalad a median tongue-like 

 chitinous process (Plate 5, fig. 3). Palpus triarticulate, terminating 

 in a simple claw of moderate size. None of articles with a process. 

 First maxillae with two long membranous lappets on each side. Inner 

 division set off by a distinct suture. Coxae completely fused. 



Prehensors large; conspicuously exposed from above and extending 

 much beyond front margin of head. Claw commonly serrulate proxi- 

 mally within ; always armed at base with a stout black conical tooth. 

 Femuroid armed within near distal end with a larger distally rounded 

 process which is paler and less strongly chitinized than the tooth of 

 claw, of about same color as rest of article. Other articles unarmed. 



No chitinous lines on prosternum. 



Ventral pores numerous; arranged in four areas, one on each 

 quarter of plate toward anterior or caudal margin as case may be. 



Spiracles circular excepting the first one which is vertically more or 

 less elongate and of large size. 



Last ventral plate narrow; its sides strongly converging caudad. 



Tergite of last pediferous segment broad, being anteriorly as wide 

 as the preceding tergite; sides convex; largely concealing the coxo- 

 pleurae from above (Plate 5, fig. 3). 



Coxopleurae moderately inflated but not unusually elongate and 

 not at all exposed at sides of last prescutum. Pores small and very 

 numerous; most abundant dorsally and ventrally along and beneath 

 edges of dorsal and ventral plate, fewer laterally and caudal end. 



