NO. 14 MILLIPEDS OF WEST INDIES AND GUIANA LOOMIS 55 



Second segment with the lateral margin of each keel but little 

 longer than the margins of the keels of the next two segments, the 

 marginal lobes not conspicuously larger than on those segments. 



All segments from the second to the penultimate inclusive with 

 four longitudinal rows of large rounded tubercles, three tubercles of 

 subequal size in each row ; surface elsewhere covered with rather 

 indefinite granules, those in the interval between the inner rows of 

 tubercles in two longitudinal rows. 



Nonporiferous segments in front of segment 15 with three lateral 

 lobes on each keel, segments 16-19, with the keels 4-lobed ; segment 5 

 with a single lobe in front of the pore process, all other pore-bearing 

 segments with two lobes in front of the process, which projects from 

 the posterior corner of the keel (fig. 27, b). Segments 2 to 18 with 

 two lobes on the posterior margin laterad of the outer row of large 

 dorsal tubercles, the outer lobe the largest and slightly elevated. 



Last segment with a long tubercle on each side of the middle bent 

 caudad and slightly exceeding the posterior margin. 



Females with scarcely any crest on the ventral side of the third seg- 

 ment immediately behind the second pair o-f legs. 



From the description and the drawings of P. sequcns (Chamberlin) 

 it is evident that it is closely related to P. crcsccntis but is of larger 

 size; the basal joints of the gonopods of the 19- and 20-segmented 

 specimens of P. crescentis are broader than long, but in P. sequens 

 the basal joints are distinctly longer than broad ; apical joint of the 

 gonopods not showing in the immature Florida specimens and broken 

 in the mature one. 



Specimens of P. f/raiiulofro)is (Chamberlin) have been found in 

 several localities in Haiti, and a description has been prepared from 

 them, which allows comparison with P. crescentis. 



PSOCHODESMUS GRANULOFRONS (Chamberlin) 



Trcscolobtts gramilojrons Chamberlin, Bull. Mus. Comp. Zoo!., vol. 62, p. 221, 



1918. 

 Dominicodesinus gcopJiUiis Chamberlin, Proc. Biol. See. Washington, vol. 36, 



p. 189, 1923- 

 Examination of the paratypes of T. granulofrons showed it to be 

 a species of Psochodesmus and, furthermore, in comparison with 

 specimens of D. geophilus it was obvious that but a single species 

 was involved. The type of T. granulofrons seems to be no longer 

 in the Museum of Comparative Zoology, Cambridge, Mass. ; hence 

 the examination had to be from the paratype material. 



