46 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



pied by the four large areas, which are even more conspicuous than 

 on the preceding segments. Anterior rim of the subsegments con- 

 spicuous on the carinae but less evident across the dorsum. Posterior 

 angles of the carinae not definitely produced backward until seg- 

 ment 16 or 17. 



Last segment with two prominent dorsal tubercles. 



Fig. 22. — Docodesmus sculpfuratus. Gonopod. 



Gonopods as shown in figure 22, the basal joint large, hemispherical. 



Legs of the males without special modifications except that the 

 sternum between the fourth legs bears two tiny rounded tubercles. 



Females with the anterior ventral margin of segment 3 elevated 

 for a long distance into a very prominent ridge directed obliquely 

 backward, the median portion thin-edged, the lateral angle on each 

 side higher and several times as thick. 



Type.— U.S.N. M. no. 1102. 



DOCODESMUS TRINIDADENSIS Chambeilin 



Plate 4, fig. 2 



Docodesmus trinidadensis Chamberlin, Bull. Mus. Comp. Zool., vol. 62, p. 219, 

 1918. 



Specimens were collected in Trinidad at Sangre Grande, in the 

 Aripo Valley, and in the Arena Forest area; others were found at 

 Scarborough and Man-of-War Bay, Tobago. 



The largest specimen was 12 mm long and 2.2 mm wide. The living 

 color ranged from black with the carinae deep reddish-brown to en- 

 tirely black with the exception of a narrow reddish area along the front 

 margin of segment i. 



Body moderately convex ; rather coarsely sculptured but relatively 

 less prominent than D. sculpturatus ; the transverse convex polygonal 

 areas of the dorsum are more pronounced and there are more fine, 

 irregular granulations in addition to the large tubercles. The areas 

 separated by sulci along the posterior margin of the segments project 



