CHAMBERLIX: WEST INDIAN CHILOPODA AND DIPLOPODA. 247 



211a. Belonodesmus thaxteri, sp. nov. 



Type — M. C. Z. 4,530. Pamtypes — M. C. Z. 4,531. Trinidad: 

 Port of Spain. Roland Thaxter. 



Body above reddish brown, or in large part cherry-red. Pleural 

 and ventral regions a duller brown. Antennae and legs light brown 

 or distally yellow. 



Head with a well-marked vertigial sulcus. Antennae separated 

 by a distance greater than the length of the first article but much 

 less than that of the second. Second article longest; third, fourth, 

 fifth, and sixth not much differing in length; the sixth strongly cla- 

 vately thickened, the seventh thickened at base and narrowing sub- 

 conically distad. 



First tergite semicircular, with true but narrow lateral keels the 

 caudal angle of which is moderately produced; surface minutely 

 sparsely granular, pilose. Second tergite with three rows of strongly 

 developed tubercles; each keel with two lateral teeth in front of the 

 caudal spine, the caudal margin with none, the anterior convex and 

 smooth. Third and fourth with three lateral teeth on each side in 

 front of the caudal process, with three rows of tubercles. Fifth 

 somite on each side with three lateral teeth and four rows of tubercles, 

 the sixth with four lateral teeth, the following pore-bearing segments 

 with three, the number of rows of tubercles increasing. On the most 

 posterior tergites the tubercles undergo reduction in size, on the 

 eighteenth and nineteenth being very small, almost granule-like, on 

 the seventeenth intermediate. 



Anal tergite narrowly truncate at tip. The first marginal tubercle 

 proximad of the tip on each side elongate, much longer than the others. 



In the male the third joint of the second legs of the sixth somite is 

 more crassate than in other legs, is bowed, and bears at the proximal 

 end from the ventral side a short, uncate process. 



Distal division of phallopod in male with a shorter process antero- 

 mesal in position and outer longer and more slender process which 

 runs proximad along the phallopod, cur\'ing then first ectad and then 

 distad (cephalad). 



Length of type, a male, 16.5 mm.; width about 1.5 mm. The 

 female is more robust. 



