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. Hody bearing twenty-three pairs of legs. 



«i. Head furnished with four eyes on each side. 



Scolopendropsis, Brandt. Type bahiensis, 

 Brandt. 

 h^. Eyesabsent ; tarso-metatarsus of most of the legs composed of asingle 

 segment ; prosternal plates of maxillipeds absent. 



a^. Seventh somite without stigmata. 



Otocryptops, Haase. Type ricbiginosus (L. 

 Kochj. 

 h^. Seventh somite with a pair of stigmata. 



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

 tarsus Scolo]}ocryptops, Newport. Type Miersit, 



Newport, 

 b^. Anal leg without a claw and with multi articulated tarso-meta- 

 tarsus Newportia, Gervais. Type longitarsis 



(Newport). 



b. Body bearing twenty-one pairs of legs. 



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

 of a single segment. 



a'. Anal somite small and with slender legs. 



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



Cryptops, Leach. Type hortensis, Leach. 



¥. With distinct prosternal plates ; fang of maxillipede very 



short .... Po;-acryjj«o/w, gen. no V. Type fTeien, sp.n. 



6'. Anal somite very large and with thick legs. 



a'. With nineteen pairs of stigmata. 



Plutonimn, Cavanna. Type Zmerlinii, 

 Cavanna. 

 b''. With nine pairs of stigmata. 



Theatops, Newport*. Ty^Q posticus (Say). 



6*. With four eyes on each side of the head ; tarso-metatarsus 

 of all the legs composed of two segments. 



a'. Seventh somite without stigmata. 



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

 drical segments. 



a^". Proximal segment of tarso-metatarsus shorter 

 than the distal ; stigmata of third somite very 

 long. 



Pithopusf, nom. nov. Type Thayeri 

 (Meinert). 

 6^". Proximal segment of tarso-metatarsus longer 

 than the distal. 



* Syn. Opisthemega, Wood. 



t Syn. Rhoda, Meinert (nom. prseocc). 



