G5S 



MR. E. J. MIERS ON THE 



Hyastentjs, White {Laliaina, Dana). Carapace triangular, 

 rounded behind. Spines of rostrum long, straight, divergent 

 from their base. Prseocular spine small or obsolete. Orbits 

 small, with a hiatus above and one below. Basal joint of antennae 

 not much enlarged. Pirst ambulatory legs greatly elongated. 



Subgenus 1. Htastents. Carapace smooth and even above, 

 with none or with few long spines. Basal joint of antennae without 

 a spine at its distal end. Anterior legs in male small and slender. 

 Type Hyastenus Sehcs, White. 



Subgenus 2. Chorilia, Dana. Carapace uneven and tuber- 

 cular above. Basal joint of antennae usually with a spine at its 

 distal end. Anterior legs in male usually enlarged, with the palm 

 compressed. Type CJiorilia longipes, Dana. 



(The genus Laliaina, Dana, is intermediate between Hyastenus 

 and CJiorilia. In the form of the carapace and rostrum and an- 

 terior legs it resembles the first ; in the presence of a praeocular 

 spine, and the existence of a spine on the basal joint of the an- 

 tennJB, the second. Nevertheless, as the subgenera Hyastenus 

 and Chorilia represent two types of the genus differing much in 

 external appearance, it seems better to retain them as distinct.) 



Naxia, M.-Edio. {Naxioides, A. Milne-Edwards; Podopisa, 

 Hilgendorf). Carapace subtriangular. Spines of rostrum pa- 

 rallel, and bearing near their extremities an accessory spinule. 

 Prasocular spine usually present. Orbits as in Hyastenus^. Basal 

 joint of antennae longer than broad ; its antero-external angle 

 tuberculiform. Eirst ambulatory legs very long. Type I^accia 

 ser^ulifera, M.-Edwards. 



Scarcely distinct, perhaps, as a genus, from Hyastenus. 



MiciPPOiDES, A. Milne-Edivards. Carapace subtriangular. 

 Spines of rostrum rather short, deflexed, acute. No prjeocular 

 spine. Basal joint of antennae enlarged, without spine or tubercle 

 at its distal end. Anterior legs in male with the palm dilated. 

 Ambulatory legs of moderate length. Type 3Iicip^oides angusti- 

 frons, A. M.-Edwards. 



Marks a transition to ^rionorhynchus among the Periceridse. 



In young specimens of N. serioulifera the fissures of the orbits are wider, 

 and constitute a veritable hiatus. It appears, therefore, necessary to unite 

 Naxioides, A. M.-Edwards, with this genus, as it is only distinguished by the 

 absence of a praeocular spine, a character which by itself cannot be considered 

 of generic importance. 



