680 PliOCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



species of Calliony7nus, which they resemble in form, color, and habits, 

 they are known as " Kochi." 



KEY TO GENERA. 



a. A stout antrorse spine on the lower face of the preopercle; margin of iris entire; no 



ocular cirri; scales 50; lateral line nearly smooth Rogadius «1 



aa. Preopercle without antrorse spine; ocular cirri present and margin of iris fringed 

 in some species; scales 40 to 120. 



b. Head more or less strongly armed with spines and serratures; teeth in villiform 



bands on jaws, vomer, and palatines, the vomerine bands separate, paired, and 

 set lengthwise of the shaft of the bone; scales 40 to 90; lateral line armed or 

 not Thysanophrysb2 



c. Ocular cirrus wanting Insidiator 



bb. Head entirely or nearly smooth; vomer with small canine-like teeth, in a cres- 



centic band, set at right angles to the shaft of the bone; palatines with a 

 single most prominent row of canine-like teeth; scales very small, usually 

 more than 100; lateral line smooth Platycephalus ^3 



1. ROGADIUS Jordan and Richardson, new genus. 



Head rather longer and less depressed than in most species of 

 Insidiator, and much more so than in Platycephalus, well armed with 

 spines and small serratures; a stout antrorse spine on the lower face 

 of the preopercle and 3 spines at the angle, directed backward; cornea 

 without cirri or lappets; scales moderate, about 50 in lateral line, 

 which is smooth except anteriorly; teeth as in Tkysanophrys. 



A single species is found in the seas of China and Japan. 



(rogad, Arabian name of Platycephalus indicus.) 



Type of genus. — Rogadius asper. 



I. ROGADIUS ASPER (Cuvier and Valenciennes.) 



Platycephalus asper Cuvier and Valenciennes, Hist. Nat. Poiss., IV, 1829, p. 257 

 (Japan). — Richardson, Ichth. China and Japan, 1846, p. 217 (Canton). — 

 Temminck and Schlegel, Faun. Japon., Pise, 1843, p. 40, pi. xvi, figs. 4 and 

 5 (after Cuvier and Valenciennes) . — GtJNTHER, Cat. Fishes, II, 1860, p. 190 

 (China). — Ishikawa, Cat. Fishes, Imp. Mus. Tokyo, 1897, p. 48 (Kagoshima). 



(?) Platycephalus macrolepis Nystrom, Svensk, Vet.-Akad Handl., 1887, p. 13, 

 IV, No. 4, p. 26 (Nagasaki) (not of Bleeker). 



Habitat. — Sandy coasts of southern Japan and southern China. 



a In addition to the single species {R. asper) found in the waters of JapC'."'-. Platyce- 

 phalus pristiger Cuvier and Valenciennes and P. polyodon Bleeker may be referred to 

 this genus. 



b In addition to the Japanese species, the following may be regarded as belonging to 

 the genus Thysanophrys: scaber Linnseus, neglectus Troschel, detrusus Jordan and Seale, 

 mcdabaricus Cuvier and Valenciennes, isacanthus Cuvier and Valenciennnes, malaya- 

 nus Bleeker, bosschei Bleeker, bataviensis Bleeker, rodericensis Cuvier and Valen- 

 ciennes, borboniensis Cuvier and Valenciennes, bobossok Bleeker, sundaicus Bleeker, 

 macracanthus Bleeker, celebicus Bleeker, pristis Peters, cirronasus Richardson, etc. 



c The following extra Japanese species may be retained in the genus Platycephalus: 

 P. fuscus Cuvier and Valenciennes, tasmanius Richardson, Isevigatus Cuvier and 

 Valenciennes, inops Jenyns, grandispinis Cuvier and Valenciennes, bassensis Cuvier 

 and Valenciennes, proximus Castelnau, richardsoni Castelnau, castelnaui Macleay, 

 dnereus Gtinther, grandis Castelnau. 



