HERPETOLOGY OF JAPAN. 229 



Genus TAKYDROMUS « Daudin. 



1803. Tuhjdromus Daudin, Hist. Nat. Kept.. Ill, p. 251 (type, T. quadnlimalus 



Dai id ill). 



1804. Tachidromus Latreille, Nouv. Diet. d'Hist. Nat., XNIV, tahl. iiu'tli., 



p. 63 (emendation). 

 180(i. Tackydromus Frokiep, Duiucrirs Anal. Zcjol. ((iernian IransL), p. 83 



(emendation). 

 1845. rachysai(rvs Gray, Cat. Liz. I'.rit. Mas., p. 52 (type, T. japonicvs). 



KEY TO JAPANESE, KOREAN, AND FORMOSAN SPECIES OP TAKYDROMUS. 



a' Dorsal scales small, not arranged in longitudinal series T. dorsalis, p. 229. 



a- Dorsal scales Ir.rge, arranged in longitudinal series. 

 6' Three pairs of submental shields. 



c^ Width of head more than half the length of shielded part of head. 



d^ One inguinal pore on each side T. septentrionaUs, p. 232. 



d'~ Two inguinal pores on each side - T. formosanus, p. 235. 



c- Width of head one-half the length of shielded part of head. 



T. sinaragdinvs, p. 236. 

 b'^ Four pairs of submental shields. 



c^ More than one inguinal pore on each side. 



d' Two (very rarely three) inguinal pores on each side; not more than six rows 

 of enlarged dorsals; posterior enlarged throat scales pointed. 



T. tachynromoides, p. 238. 

 d- Three inguinal pores on each side; eight rows of enlarged dorsals; posterior 



enlarged throat scales scarcely pointed T. amurensis, p. 245. 



c- One inguinal pore on each side T. wolteri, p. 247. 



TAKYDROMUS DORSALIS b Stejneger. 



1904. Tahjdromus dorsalis Stejneger, Smithson. Quarterly (Misc. Coll., XLVII), 

 Nov. 9, 1904, p. 294 (type-locality, Ishigaki shima, Yaeyama Archi- 

 pelago, Riu Kiu Islands, Japan; type U.S-N.M. No. 34162). 



Description.^Adult male; U.S.N.M. No. 34162; Ishigaki shima, 

 Riu Kiu; April-June, 1899; A. Owston collection (figs. 199-202). 

 Rostral not in contact with internasal, its upper lateral corner, formed 

 by the suture with the first supralabial, barely entering the nostril; 

 nostril rounded, between two nasals, the anterior being in contact 

 with that of tlie other side behind the rostral, the posterior in contact 

 with only one supralabial, the first; two loreals, of which the posterior 

 very large ; internasal much longer than broad, about three-fourths the 

 length of the prefrontals, which are nearly as long as the frontal ; two 

 large supraoculars in contact with frontal; a very small third one 

 behintl, which is barely touchuig the outer corner of the front o-parietals ; 

 supraoculars separated from the superciliaries by a single row of gran- 

 ules, the anterior of which is somewhat enlarged and separates the first 

 supraocular from the posterior loreal; fronto-parietals sHghtly longer 

 than the internasal; parietals longer than frontal; interparietal small, 

 narrow; occipital slightly smaller, triangular; six supralabials, the fifth 



a Careless transliteration for Tachydromus, from raxv?, swift, and Spouoi, running. 

 b Signifying dorsal; referring to the unitpie arrangement of the scales on the back. 



