56 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



Numerous specimens, all of which are females with not more than 

 19 segments, were collected by O. F. Cook and H. F. Loomis in the 

 following localities in Haiti ; Thor, near Port-au-Prince ; Ennery ; 

 near Plaisance ; Petite Riviere de Artibonite ; and on Morne Pil- 

 boreau. Armour Expedition locaHties include Orangetown, St. Eus- 

 tatius ; Basse Terre, St. Kitts ; Boggy Peak, Antigua ; St. Claude 

 above Basse Terre, Guadeloupe ; Arena Forest, Trinidad. 



Length of the largest specimen 5 mm, width .7 to .8 mm. 



Living color light pink to buffish-pink or light brownish-red. 



First segment with the anterior margin more nearly straight across 

 than in P. crescentis, with the usual 10 lobes or scallops separated 

 from each other by deep incisions, except the two outer lobes on each 

 side, which are very shallowly separated or not at all (fig. 28, a) . Sur- 

 face with the 10 tubercles larger and higher than in P. crescentis, the 

 granules also larger and more definite in shape. 



Fig. 28. — Psochodesmus granulofrons. a, first segment, dorsal view ; b, keels of 

 segments 9 and 10, dorsal view. 



Second segment with the lateral margin of each keel half again as 

 long as the margins of the keels of either the third or fourth segment, 

 and the marginal lobes conspicuously larger. 



Ensuing segments with the large tubercles in the dorsal rows higher 

 and more definitely shaped than in P. crescentis^ the middle tubercle 

 in each row a little smaller than the one on either side of it ; remainder 

 of the surface covered with sharply defined granules of various sizes, 

 those in the interval between the inner rows of tubercles irregularly 

 disposed except on several of the anterior segments, the interval itself 

 wider than that in P. crescentis. 



Nonporiferous segments with the keels lobed as in P. crescentis, 

 although behind segment 15, the keels may appear 3-lobed; all the 

 poriferous segments with a single lobe in front of the pore process, 

 which projects outward and slightly backward from near the middle 

 of the lateral margin and apparently replaces both the middle and 

 posterior lobes (fig. 28, b). On each segment the posterior margin 



