248 On >S/;fc/es o/'Opistlioplitlialmus. 



2 to 4 much enlarged posteriorly; 

 ir.terocular area smooth ; hands 

 narrow, width less than length of 

 hand-back ; fingers very long, the 

 movable more than twice the 



width of the hand anstcrus, Karsch, S , 



b^^. Tail robust ; denticles of upper 

 keels hardly enlarged poste- 

 riorly ; interocular area gran- 

 ular ; hand stouter, its width 

 much excelling the length of 

 the hand-back, and more than 

 half the length of the movable 



digit macer, Thor., c5' • 



Z*'". Sterna of abdomen rugose, the last 

 granular; palpi and tail propor- 

 tioned almost as in maccr. 

 a^'^. All the abdominal sterna thiokly 

 granular ; first and second seg- 

 ments of tail longer than carapace, 

 whicli equals the fifth segment in 



length brevicej:s, sp. n., J • 



b^^. Not all the sterna evenly granular, 



the anterior at most slightly 



wrinkled. 



fl'^. Interocular area nearly or quite 



smooth ; hand much more finely 



granular ; anterior sterna 



smooth ; inferior median keels 



on first caudal segment nearly 



obsolete c/labrifrons, Pet., (^ • 



6'^. Interocular area entirely gran- 

 ular ; hand strongly crested 

 and tubercular ; first caudal 

 segment strongly and grauularly 

 keeled below pj/r/naa-, Thor., c? • 



EXPLANATION OF PLATE X. 



Fiy.^- Ojiisthophthalmus granifrons, sr^.n. Carapace and chela, 5« 



F^y. 1 a. Ditto. Genital operculum and comb of one side. 



Fig. 1 b. Ditto. Carapace and chela, cj'. 



Fig. 2. O^MstJuiphfliahmis nitidiceps, sp. u. Carapace and chela, 5« 



Fig. 2 a. Ditto. Genital operculum and comb of one side. 



Fig, 3. Opisfhop/it/ialnins breviceps, sp. n., (S • Nat. size. 



Fig. 3 a. Ditto. First abdominal sternum. 



Fig. 4. Opidliophthalmus aiisferus, Karsch. Brachium and manus of 



chela, (S , 

 Fig. 5. Opist/ivjjhflialmns macer, Thorell. Brachium and manus of 



chela, (S . 



