NO. 14 MILLIPEDS OF WEST INDIES AND GUIANA — LOOMIS 



29 



ment it is apparent that they are most closely related to the genotype, 

 O. neotropicum Silvestri. 



Family CHELODESMIDAE 

 AMPHELICTOGON BIDENS, n. sp. 



Plate I, fig. 4 



A male type and two females were found near Arthurstown, Cat 

 Island, January 4, 1932, in a natural pit in the limestone rock, locally 

 called a " banana hole " from the fact that bananas are planted in these 

 pits, which afford protection from the constant winds. 



Diagnosis.- — ^Judging from Chamberlin's description^ A. bahanii- 

 ensis is closely related to A. bidens but has only a single tooth on the 

 inner side of the posterior or ventral division of each gonopod, whereas 

 A. bidens has two teeth. Moreover, it is inferred that A. bahamiensis 



Fig. 14. — Amphclictogon bidens. a, lateral keel of segment 15, male ; b, gonopods. 



conforms to the generic description in having one or two teeth on the 

 posterior margin of the keels, but the keels of A. bidens are without 

 marginal teeth. 



Description. — Length 20 mm, width 2.5 mm. Male a little more 

 slender than the female. Body widest at the second segment in both 

 sexes. 



In live specimens the head is chestnut-brown with a darker area 

 between the antennae ; first segment brown with the lateral angles 

 almost white; segments 2 to 4 chestnut-brown with the posterior 

 angles nearly white, the other nonporiferous segments, including seg- 



' Bull. Mus. Comp. Zool., vol. 62, pp. 231, 232, 191 



