NO. 14 MILLIPEDS OF WEST INDIES AND GUIANA LOOMIS 37 



segments including the keels with 14 erect thickened setae. Setae 

 similarly disposed on the other segments. Males with the lateral keels 

 more sharply produced forward, the posterior margin of the segment 

 carried back on either side of the middle into a broadly triangular lobe 

 extending over the next segment (fig. 19, b). The third male segment 

 also has two similar lobes extending over segment 4. The fourth male 

 segment with the dorsum very short, depressed below the level of the 

 segments on either side of it, the keels strongly ascending, the six 

 setae between the keels in a single row along the posterior margin 

 instead of there being two in front and four behind as on the other 

 segments. 



Ensuing segments similar in the sexes, the posterior ones narrowing 

 gradually, the posterior angles increasingly more produced to seg- 

 ment 17, after which they decrease in size and are scarcely apparent 

 on segment 19. The setae along the posterior margin of segment 19 

 are about double the length of those on the other segments. 



Last segment small, ending in a short, horizontal, truncated cone ; 

 sides emarginate. 



Anal valves strongly convex, with thin, raised margins. 



Preanal scale broad at base, the sides emarginate, the apex broadly 

 truncated with a seta at each corner (fig. 19, c). 



Gonopods exceedingly simple, consisting of two broad, thin, erect, 

 apically rounded plates resembling tiny tombstones, the basal portion 

 of each broadened ; the plates oblique-transverse and in contact along 

 their mesial sides (fig. 19, d). The opening in the segment through 

 which the gonopods project is widest in front, with the posterior 

 margin raised into a high rim. 



First male legs smaller than those of the female. 



Second male legs with each coxal joint bearing a small tubercle near 

 the base ; second joint somewhat produced at the apex posteriorly ; 

 joints 3, 4, and 5 thin but greatly expanded vertically ; joint 6 thick- 

 ened at the base, narrowing distally, with a comb of fine hairs along 

 the ventral side (fig. 19, e). 



Third male legs with each coxal joint produced into a high process 

 with long hairs behind and along the inner side to the tip ; joints 2 

 and 3 thin but greatly expanded vertically ; the three distal joints 

 nearly normal, the terminal one lacking a ventral comb of hairs ; ster- 

 num very greatly elevated transversely into a broad, thin, posteriorly 

 concave prominence, very woolly in front and topped by two locks of 

 long, twisted hairs ; the posterior concave face of the elevation is 

 glabrous and shining (fig. 19, /). 



