II. ANATOMY AND DESCRIPTION OF GENEIU AND SPECIES. 



On examining the various species that have been pkiced in the genus Halohates, it 

 soon became evident that they could not with propriety be retained in one genus, and 

 that, in fact, they make part of at least three genera. As, however, this paper deals 

 only with those genera, some, if not all, of the species of which are marine, two genera only 

 require to be noticed. These are Halohates proper and a new genus Halohatodes. Had 

 the species of the latter genus not existed, there would also be grounds for establishing a 

 new sub-family for the genus Halohates. As it is, Halohatodes (of which the typical 

 species is Halohates lituratus, St&l) and Stc/phania (a new genus proposed for the recep- 

 tion of Halohates jnctus, Germar) form connecting links between Halohates and the more 

 typical genera of the sub-family Hydrohatina, in which Halohates has hitherto been 

 placed. To retain it in this position, however, some modification in the definition of 

 the sub-family will be necessary ; as, for example, in this respect, that, while the Hydro- 

 hatina are said to have two-jointed tarsi, Halohates has the hinder tarsi only one- 

 jointed. 



The two genera under consideration may ha thus distinguished : — 



1. Body tliickly clothed with short pubescence ; front tibia with a triangular dilatation near 



the apex ; middle tibia and first joint of tarsus with a long fringe ; hind tarsus with one 

 joint, ........ Halohates 



2. Body more sparsely clothed with short pubescence; front tibia cleft, but not with a triangular 



dilatation at the apex ; middle tibia and tarsus without a long fringe ; hind tarsus with 

 two joints, . ...... Halohatodes. 



HALOBATES, Esehseholtz. 

 Entomographien, i. p. 106, 1822. 



Body oval or oblong. 



Head shortly triangular. 



Antennce four-jointed, with two intermediate jointlets. First joint always 



the longest. 

 Rostrum four-jointed ; first and second joints veiy short, the latter ringlikc ; third 



joint the longest. 



