228 Mr. R. I. Pocock on new 



serve to show how the new genera here characterized stand 

 towards each other and towards those that have been pre- 

 viously made known : — 



a. Body bearing twenty-three pairs of legs. 



a 1 . Head furnished with four eyes on each side. 



Scolopendropsis, Brandt. Type bahiensis, 

 Brandt. 

 ft 1 . Eyesabsent ; tarso-metatarsus of most of the legs composedof asingle 

 segment ; prosternal plates of maxillipeds absent. 



a 2 . Seventh somite without stigmata. 



Otocryptops, Haase. Type rubiginosus (L. 

 Koch). 

 ft 2 . Seventh somite with a pair of stigmata. 



a 3 . Anal leg armed with a claw and with bisegmented tarso-meta- 

 tarsus Scolopocryptops, Newport. Type Miersii, 



Newport, 

 ft 3 . Anal leg without a claw and with multi articulated tarso-meta- 

 tarsus Nezvportia, Gervais. Type longitarsis 



(Newport). 



ft. Body bearing twenty-one pairs of legs. 



a*. Eyes absent ; tarso-metatarsus of most of the legs composed 

 of a single segment. 



a 5 . Anal somite small and with slender legs. 



a 6 . Without prosternal plates ; fang of maxillipede long. 



Cryptops, Leach. Type hortensis, Leach. 



ft 6 . With distinct prosternal plates ; fang of maxillipede very 



short .... Paracryptops, gen. nov. Type Weberi, sp. n. 



ft 5 . Anal somite very large and with thick legs. 



a 7 . With nineteen pairs of stigmata. 



Plutonium, Cavanna. Type Zivierlinii, 

 Cavanna. 

 ft 7 . With nine pairs of stigmata. 



Theatops, Newport*. Type posticus (Say). 



ft 4 . With four eyes on each side of the head ; tarso-metatarsus 

 of all the legs composed of two segments. 



a 9 . Seventh somite without stigmata. 



a 9 . Anal legs armed with a claw and with subcylin- 

 drical segments. 



a 10 . Proximal segment of tarso-metatarsus shorter 

 than the distal ; stigmata of third somite very 

 long. 



Pithopusf, nom. nov. Type Thayeri 

 (Meinert). 

 ft 10 . Proximal segment of tarso-metatarsus longer 

 than the distal. 



* Syn. Opisthemega, Wood. 



t Syn. lihoda, Meinert (nom. praeocc). 



