NO. 14 MILLIPEDS OF WEST INDIES AND GUIANA LOOMIS 



33 



also includes Tobago Island, near the eastern end of which, at Man-of- 

 War Bay, it was collected in February 1932. 



This species was erroneously placed in the Polydesmidae instead of 

 the present family, where all its characters indicate that it belongs. 

 The pores are not " near the margin of the keels on the dorsal side " 

 but are actually in the thickened rim of the margin, the oblique eleva- 

 tion of the keels allowing the pores to be plainly seen from above. 

 The gonopods, one of which is shown in figure 17, are definitely 

 chelodesmid. 



Fig. 17. — Bclonodcsmu^ thaxtcri. Gonopod. 



In addition to the characters given in the original description, it 

 was noted that there is a serrate-tubercular ridge on the side of each 

 segment from 2 to 17 located a short distance above the base of the 

 legs. The sterna are high and wide with the legs lateral to them ; there 

 is a distinct tooth behind each coxal joint on the segments from just 

 in front of the middle of the body to its rear end. 



In the male the fifth joint of the first leg is produced distally into 

 a lobe reaching almost to the claw of the last joint ; the succeeding 

 four pairs of legs have similar ventral lobes decreasing in size. Ster- 

 num between the fourth legs with two thin, high, transverse tubercles ; 

 that between the fifth legs with two smaller conic tubercles; and that 

 between the sixth legs with two higher tubercles. 



PRIODESMUS ACUS Cook 

 Plate 2, fig. 3 

 Priodesmiis acus Cook, Proc. U.S. Nat. Mus., vol. 18, pp. 55, 56, 1895. 



A mature female and a nearly mature male were collected about 70 

 kilometers from Paramaribo, Dutch Guiana, beside the railway lead- 

 ing to the Cable Station on the Surinam River, March 3, 1932. 



