CLASSIFICATION OF THE MAIOID CEIJSTACEA. G55 



"well defined. Second and third joints of antennae slender. Am- 

 bulatory legs slender, cylindrical. 



Subgenus 1. Herbstia. Inferior margin of orbit without a 

 tooth. Ambulatory legs not spinose. Type Herhstia condyliata 

 (Herbst). 



Subgenus 2. *Herbstiella, Stm. Inferior margin of orbit 

 toothed. Merus joint of ambulatory legs spinose. TypeSeri- 

 stiella depressa, Stm. 



This genus establishes a relationship to Mithrax. 



*CcELOCEEirs, A. Milne- JEdwards. Carapace suborbiculate. 

 Eostrum prominent, with a shallow notch at its distal end, and 

 its lateral margins involuted. Second and third joints of antennae 

 slender. Legs short. Type Coelocerus spinosits, A. M.-Edwards. 



Is nearly allied to Lihinia ; and it may be desirable so to mo- 

 dify its characters as to include any species of that genus which 

 may have the orbital margin incomplete or notched. The involu- 

 tion of the margins of the rostrum is of minor importance, as the 

 same character occurs in a lesser degree in the typical species of 

 Lihinia (L. emarginatd). 



§§ Hostncm composed of tivo more or less distinct divergent spine 

 Orbits deep, so that tlie eyes, lohen retracted, are concealed; tlie 

 eyes themselves small, the eye-peduncles slender. 



t Orlits large, with a forward aspect, usually very incomplete helow, 

 the upper orbital margin usually prominent, loith two deep fissures 

 and long spines. 



*JFlagellum of the antennce arising within the orhital cavity. 



Maia, Zamarck. (Plate XII. figs. 7, 8.) Spines of rostrum 

 divergent from their base. Carapace triangulate-oblong, the 

 interorbital space broad. Basal joint of antenna? very much en- 

 larged. Anterior legs in male rather slender ; wrist elongated, 

 not carinated. Type Maia sgidnado (Linn.). 



*~*Magellum of the antennce arising within the orhital margin, and 

 separated from the cavity of tlie orhit hy a narrow process of the 

 hasal joint. 



Paramithrax, M.-Edioards. Carapace subtriangalar. Spines 

 of rostrum divergent from their base. Anterior margin of buccal 

 cavity straight, or nearly so. Basal joint of antennae very much 



LINF. JOURN. — ZOOLOGY, TOL. XIV. 49 



