54 PBOCEEDINGS OF THE NATIONAL MUSEUM vol. 66 



than f ronto-nasal, in contact behind interparietal : no nuchals ; two 

 loreals, hi^jher than wide, slightly smaller than prefrontals, in con- 

 tact with first and second supralabials; lower eyelid scaly: six 

 supralabials, fourth longest, about twice as long as the preceeding 

 ones ; above fifth two small subocnlars ; temporals undifferentiated, 

 scale-like, smooth; ear-opening moderate, round, with no projecting 

 lobules; a single, pentagonal, narrow shield behind the mental; 

 submandibulars small, scarcely differentiated ; 28 rows of scales 

 around the middle of the body, of nearly equal size, those on occiput 

 and upper neck smooth, dorsals tricarinate, the keels increasing in 

 distinctness posteriorly and reduced to tAvo strong keels on the lower 

 back and tail ; scales on underside smooth ; preanal scales not en- 

 larged; legs short, hind leg being contained about three and one 

 third times in distance fi"om snout to vent, while fore and hind 

 legs fail to meet by the length of the foot: digits short, first espe- 

 cially so, covered above with smooth imbricate, alternating scales, 

 one on each side of the median line, the terminal enlarged and cover- 

 ing the base of the claw: tail cylindric. longer than head and body, 

 tapering to a point: the caudal scales above with two strong keels 

 which extend slightly beyond the edge of each scale, underneath 

 smooth with rounded posterior edge: no transversely elongated 

 scales underneath. 



Color (in alcohol) : Above pale brown, each scale darker at the 

 base, the keels paler, and on the tail with scattered small whitish 

 spots; flanks speckled with small black and white spots; sides of 

 neck, from and including the ear, with large in-egular black spots; 

 temples speckled with black; supralabials whitish; above and below 

 by a narrow black border; underside whitish. 



DIMENSIONS „,„p 



Total length 102 



Snout to vent 43 



Vent to tip of tail 59 



Snout to ear-opening 8.5 



Greatest width of head 7 



Axilla to groin 23 



Fore leg 9 



Hind leg 13. 5 



Remarks. — The discover}^ on the Chinese mainland of a second 

 species of this most distinct genus is highly interesting. Only one 

 species, Lygosaurus peUojjJeurus., Avas known from the middle and 

 northern groups of the KiuKiu Archipelago,*^ but no species has 

 been recorded from Formosa, though we ma}^ confidently expect its 

 discovery there some day. 



" Stejneger, Ilerpetology of Japan, 1907, p. 222, pi. 7, fig. 3. 



