216 bulletin: museum of comparative zoology. 



two species known from Jamaica. It is at once separable from C. 

 porcellanus in lacking the conspicuous notch in the posterior margin 

 of the keels of the posterior portion of the body as well as very obvi- 

 ously in the form of the keels of the third segment, these remaining 

 of the same length as the median portion of the tergite, not expanding 

 and extending forwards over the keels of the preceding somite. The 

 second keels parallel the third, the two on each side closely contiguous. 

 The keels of the fourth somite distally strongly rounded, much less 

 acute than in C. porcelkmu^. 



The general color is yellowish, somewhat darker in an oblique area 

 beginning at base of each keel and in a mid-dorsal line. 



Length of about 12 mm.; width 3.5 mm. A paratype is larger, 

 near 16 mm. in length. 



Platyrachidae. 

 157. Platyrachus luciae Pocock. 

 Journ. Linn. soc. London, 1894, 24, p. 511, pi. 39, f. 3-3d.i 



Habitat. — St. Lucia: Fond de Jaques (G. A. Ramage).^ 



158. Platyrachus (?) maculatus BoUman. 



Stenonia maculata BoUman, Proc. U. S. N. M., 1888, 11, p. 336. i 

 Habitat — Cuba (F. Poey).i 



Chytodesmidae. 



159. DocoDESMUS vincenti (Pocock). 



Cryptodesmus vincentii Pocock, Journ. Linn. soc. London, 1894, 24, p. 510, pi. 39, 

 f. 2-2d.i 



Habitat.— St. Vincent (H. H. Smith). ^ 



160. Docodesmus haitiensis, sp. nov. 



Ti/K.— M. C. Z. 4,464. Haiti: Diquini. Paratypcs.— M. C. Z. 

 4,465-4,470, 4,481. Haiti: Emery, Petionville, Furcy, Jacmel. W. 

 M. Mann. 



