chamberlin: west Indian chilopoda and diplopoda. 249 



than the second tergite. The second and immediately succeeding 

 somites also on caudal border emarginate toward middle, the median 

 length obviously shorter than that toward the sides. Caudal corners 

 much rounded in anterior tergites, but becoming quadrate in the 

 posterior ones. Tubercular setae very long. 

 Length, 6.5 mm.; width .8— mm. 



EURYURIDAE. 



212a. Aphelidesmus divergens sp. nov. 



Type. — M. C. Z. 4,534. Trinidad: Arima, Verdant Vale. Roland 

 Thaxter. Paratypcs.— 'M. C. Z. 4,535-4,540. Tobago: Milford 

 Bay, Richmond Bay, King Bay, Plymouth, Scarboro. H. L. Clark. 



This species seems to be readily separable from those previously 

 described, all from Central America and northern South America, 

 in the structure of the male gonopods. These are segmented as usual; 

 the distal division is geniculate toward its base with the plate-like 

 division thin and nearly transparent, subcircularly expanded or 

 broadly oblong and distally rounded, concave on the dorsal side; from 

 its base on the ectal side a much more slender branch which is biden- 

 tate at tip; on the mesal side of the proximal end of the tarsal or 

 distal division a membranous extension or sheath by which the semi- 

 nal style is protected. A short rounded process on ectal side near 

 origin of style. 



The prozonites are dusky chestnut or chocolate-brown, the meta- 

 zonites black in individuals in full color, excepting the keels which are 

 bright yellow. Head also deep black of weak chestnut cast excepting 

 the labrum and a triangular elevated region extending dorsal between 

 the antennae, this region being light brown. Legs and antennae pale 

 brown. 



Head smooth. Vertigial sulcus distinct as usual. Sixth article of 

 antennae longest, the second, third, fourth, and fifth nearly equal to 

 each other. 



Anterolateral corners of keels widely rounded. Lateral margin 

 emarginate at level of pores, not toothed. 



Last tergite broad and plate-like, narrowed caudad with the caudal 

 margin widely convex, mesally emarginate as in A. glaphyros and 

 A. hennaphrodihis. 



Length of the type (male), 32 mm.; width, 5.6 mm. 



