NO. 14 MILLIPEDS OF WEST INDIES AND GUIANA LOOMIS 43 



the posterior margin, their length intermediate between the two dorsal 

 series ; in the male the setae are on small marginal teeth which are 

 obsolete on the last few segments ; the females with teeth indefinite 

 or lacking. Beginning with the second segment the posterior margin 

 of each segment has a broad triangular sinus or emargination on each 

 side adjacent to the carina, causing the posterior angle of each carina 

 to appear definitely produced backward, whereas on only the last 

 segments do the corners of the carinae extend farther back than the 

 median portion of the posterior margin of the dorsum and on these 

 segments the sinus is reduced or lacking and the margin straight from 

 side to side. All nonporiferous segments, except the first and last, 

 have the lateral margin on each carina tridentate, each tooth bearing 

 a long seta ; poriferous segments with four setiferous teeth on the 

 lateral margin of the carinae and the pore opens outward and back- 

 ward from the margin of the posterior angle between the last two 

 teeth. Pores on the customary segments ; posterior angles of seg- 

 ment 19 much shorter than those of segment 20. 



Last segment with a transverse median row of six setae and two 

 setae near the papilliform apex which is short and almost horizontal. 



Anal valves strongly convex ; the margins thinly elevated. 



Preanal scale rather long, triangular. 



Sterna wide, about as in Polydesmiis. 



Basal joint of each gonopod large, subtriangular, hollowed to receive 

 the long, curved apical joint. When the apical joints are exserted, 

 one crosses the other, and each is directed toward the opposite side 

 of the body. 



In the male specimen the outer joints of the anterior legs are 

 missing, but the coxal joints are present and show no speciaHzations 

 distinguishing them from the coxae of the legs farther back. The 

 sterna between the seventh and eighth pair of legs are not definitely 

 wider than the adjacent sterna. 



This is an active little creature, apparently of much the same 

 habit as Bactrodesmus, running swiftly for shelter when disturbed, 

 with the antennae held nearly parallel in front of it. Because of the 

 small size and rapid movements several specimens escaped in the litter 

 of leaves ; the ones collected were found on the underside of a stone 

 which was upturned, and from which they were unable to escape. 



CHILAPHRODESMUS RUBELLUS n. sp. 

 Plate 2, fig. 6 

 A male (type) and two females were collected near the road on 

 the summit of Morne Pilboreau, above Ennery, Haiti, July 24, 1927, 



