NO. 14 MILLIPEDS OF WEST INDIES AND GUIANA LOOMIS 47 



as faint crenulations but are produced into acute projections only on 

 segment 19. 



Head with a deep median impression across the coarsely granular 

 area of the vertex which is separated from the front of the head by 

 a deep channel just above the antennae ; clypeal region elevated above 

 and separated from the front by a deep furrow, especially evident on 

 the sides. 



Segments with raised anterior rim strongly evident on the carinae 

 and adjacent dorsum but broken into erect crenations across the mid- 

 dle of the dorsum. 



Fig. 23. — Docodcsmus trinidadcnsis. Gonopod. 



Gonopods as shown in figure 23, the basal joint relatively small, 

 subangularly compressed, not forming an almost true hemisphere. 



Males with the sternum between the fourth legs bearing two small, 

 rounded tubercles. First joint of the fourth legs with a rounded 

 setiferous tubercle in front, the second joint with the distal anterior 

 corner continued into an acute lobe. 



Females with the anterior ventral margin of segment 3 carried up 

 into a high, thin, slightly reflexed ridge, highest at the middle and 

 without prominent lateral angles. 



In spite of the fact that my specimens are smaller, it seems evident 

 that this is Chamberlin's species, although few distinctive characters 

 were given in its description. 



DOCODESMUS ROBUSTUS, n. sp. 



Plate 4, fig. 3 



A male (type) and a female were found at Kings Bay, Tobago 

 Island, February 20, 1932. 



Diagnosis. — Besides being much shorter in proportion to its width 

 than any other species of Docodesmus, the irregular, cuspidate tuber- 

 culation of the dorsum and the lack of series of large tubercles make 

 this the most easily recognized member of the genus. It may be re- 

 motely related to D. trinidadcnsis, as the structure of the head and 

 the gonopods seem to indicate. 

 4 



