064 MK. E. J. MIERS ON THE 



Tliis genus Is only known to me from M. A. Milne-Edwards's 

 figure in the ' Mission Scientif. Mexique ' (pi. xvii. fig. 5), from 

 whicli the diagnosis is taken. Its nearest ally among the Perice- 

 rinse seems to be Sci/ra, Dana. If the orbits are incomplete, it 

 would probably be placed among the Epialtinse. It agrees, how- 

 ever, Avith most of the Periceridse in having a short epistome. 



** Basal joint of aniennas often very much enlarged, loith one or 

 more spines at its distal extremity. 



t Carapace narroio and elongated, nearly vertically defiexed in front 

 of gastric region, 



Ctphocaecinus, a. M.-Edwards. Spines of rostrum slender 

 and divergent. Spine of basal antennal joint small. Type Cyflio- 

 carcinus oninutus, A. M.-Edwards. 



ft Carapace subtriangular, not defiexed in front. 



1. Spine at antero-external angle of antennal joint very short, 

 and not visible from ahove. 



TiARiNiA, Dana. Carapace tuberculated, without a distinct 

 series of lateral spines. Spines of rostrum very slender and con- 

 tiguous. Inter orbital space broad. Anterior legs in male with 

 the palm short; fingers gaping. Ambulatory legs nodose or 

 spinose. Type Tiarinia cornigera (Latreille). 



Tylocaecinus, Miers {tvXos, a hiol). Carapace tuberculated, 

 without lateral spines. Spines of rostrum slender, divergent. 

 Interorbital space narrow. Basal antennal joint not much en- 

 larged. Anterior legs in male with the fingers nearly meeting 

 when closed. Ambulatory legs spinose or nodose. Type Tylocar- 

 cinus Styx (Herbst). 



Peeiceea, Latreille. (Plate XIII. figs. 4, 5.) Carapace with 

 a series of lateral spines. Spines of rostrum long and divergent. 

 Interorbital space broad. Basal joint of antennae very much en- 

 larged, with two small distant spines at its distal end. Anterior 

 legs long, palm slender and elongated, fingers not gaping. Am- 

 bulatory legs smooth. Type Pericera cormita, Latreille. 



2. Spine at antero-external angle ofhasal antennal joint very long, 

 and visible from above. 

 MiCEOPHETS, Milne-JEdwards {Milnia, Stimpson; Perinea, 



