210 bulletin: museum of comparative zoology. 



146. Cairibolus antonianus, sp. nov. 



Type. — M. C. Z. 4,429. Jamaica: Port Antonio. In cocoanut 

 tree stump, November 24, 1905. A. E. Wight. Jamaica: Kingston, 

 1909. T. Barbour. Paratijpes — M. C. Z. 4,430^,432. 



A dark species, the somites being black or nearly so excepting a 

 narrow ferruginous band along the caudal border, this widening 

 ventrad. Legs and antennae ferruginous. 



Head essentially smooth but under magnification seen to be very 

 minutely impressed punctate and shortly lineate. Sulcus evident 

 across vertex and again below level of antennae. Eyes separated 

 by more than their diameter. Antennae very short. 



Collum conspicuously narrowed down the sides, the sides below 

 being excavated in front. Not attaining lower edge of second tergite. 

 Margined distinctly lateral, and in front except mesally. Not striate. 



Other segments strongly striate beneath. Pore in front of suture 

 or at times nearly in line wath it. The latter distinct across dorsum, 

 strongly impressed punctate. Surface otherwise essentially smooth. 



Anal scutum caudally obtusely triangular but apex narrowly 

 rounded, a little exceeded by the valves. Anal valves strongly mar- 

 gined, convex. 



Number of somites, forty-eight. 



Length up to about 45 mm.; width to 3.1 mm. 



147. Cairibolus leiosuturus, sp. nov. 



Type.— M. C. Z. 4,433. Paratypes — M. C. Z. 4,434. Porto 

 Rico. 



Aside from differences in the male gonopods, such as in details of 

 inner (posterior) processes, the narrower tongue of the median plate, 

 and so forth., this species may be distinguished from C. cmtoniamis in 

 having the suture clear-cut and straight, not marked with a series of 

 deep punctae, the plate elsewhere, however, being subdensely im- 

 pressed punctate. The pore more distinctly removed from the 

 suture, but the latter often weakly sinuate opposite it. The colora- 

 tion is similarly dark with ferruginous caudal borders, though the 

 ferruginous bands are usually broader and better defined and the 

 dark portion commonly includes numerous light dots or areolations. 

 The legs are a lighter ferruginous, almost yellow. The collum is 



