AETHEOPOD FAUNA OP THE WEST INDIES. 487 



i". Species of small size, less than 40 

 mm. in length, and with fewer than 



47 segments solitarius, sp. n. 



b'*. The anal tergite surpassing the valves. 

 a^^. Caudal process short, segments 

 40-42. 

 a^^. Legs long, antennae reaching the 



fourth ring gracilipes, Karsch. 



h^'. Legs short, antennae not reaching 



the fourth ring grenadensis, sp. n. 



b^^. Caudal process long; segments over 

 50 ; legs very long. 

 a}^. Posterior part of the segments 



not elevated arboreus, Sauss. 



b^^. Posterior part of segments ele- 

 vated macropus, sp. n. 



The area of the dorsum in front of the 



transverse sulcus, or in front of its position 



when obsolete, crossed by a second sulcus. 



i^^. The posterior transverse sulcus complete 



dorsally, at least on the segments in the 



middle of the body. 



a}\ The anterior transverse sulcus weak 



and often interrupted, the posterior 



weaker; anal tergite not surpassing 



the valves, and not acutely produced ; 



black with brown legs leptopus, sp. n. 



b^". The two transverse sulci complete and 

 deep on nearly all the segments ; anal 

 tergite produced into a narrower or 

 wider caudal process, which surpasses 

 the valves. 

 a^'^. The anterior transverse sulcus rising 

 on each side from the lateral portion 

 of the posterior sulcus considerably 

 below the pore ; colour black, with 

 a median dorsal flavous spot, and a 

 lateral flavous spot on the pore .... leucostigma, sp. n. 

 6^^. The anterior transverse sulcus rising 

 on each side in front of and on a level 

 with the pore ; the segments dis- 

 tinctly flavo- or ferrugino-cingulate. 

 a}^. Caudal process considerably sur- 

 passing the valves, the area of 

 the segments behind the posterior 

 sulcus flavous monilicornis, Por. 



