THE LIZARDS OF THE GENUS TACHYDROMUS. 



219 



d , Kuatun 



T. 



2. 



3- 



4- 



5- 



6. 



7- 



8. 



9- 



.. 69 



35 



5 



8 



26 



11 



22 



1 



26 



... 69 



38 



6 



8 



28 



12 



24 



1 



25 



68 



39 



6 



8 



27 



10 



25 



1 



29 



70 



38 



6 



8 



28 



11 



26 



1 



28 



.. 67 



38 



8 



8 



28 



11 



23 



1 



25 



.. 67 



44 



8 



8 



28 



10 



25 



1 



26 



Table as on p. 212. 



Habitat. China along the Yang-tse-Kiang, north-west to the Province of Kansu, 

 south-east to Fokien. 



With an insufficient material, in 1887, I unfortunately united this species with 

 T. tachydromoides , from which it is perfectly distinct, differing chiefly in the number 

 of chin-shields and of femoral pores, as well as in the constantly keeled ventral 

 plates. The first two characters are not known to suffer any exceptions in the two 

 species here compared, although large series have been examined by me and by 

 others ; and this is very remarkable considering that the number of chin-shields cer- 

 tainly varies in T. smaragdinus and T. sexlineatus, as observed by Van Denburgh, by 

 Stoliczka, and by Annandale, whilst specimens with either one or two femoral pores 

 occur in T. formosanus and T. sexlineatus. 



5. Tachydromus formosanus, Blgr. 



Tachydromus formosanus, Bouleng. Ann. and Mag. N.H. (6) xiv, 1894, p. 462 ; Stejneg. Herp. 



Japan, p. 235 (1907) ; Van Denb. Proc. Calif. Ac. (4) iii, 1912, p. 245. 

 Takydromus septentrionalis, part., Stejneg. op. cit., p. 232. 

 Takydromus stejnegeri, Van Denb. t.c, p. 243. 



Body not or but slightly depressed. Head feebly convex, if to if times as long 

 as broad, its depth equal to the distance between the anterior corner or the centre 

 of the eye and the tympanum, its length 3§ to 4 times in length to vent in males, 

 4 to 4J times in females ; snout pointed, with strong canthus and nearly vertical 

 loreal region, as long as the postocular part of the head. Pileus 2 to 2\ times as 

 long as broad. Neck narrower than the head. The hind limb reaches the elbow in 

 females, the axil or the shoulder in males ; foot 1 to i| times as long as the head. 

 Tail 2 to 3f times as long as head and body. 



Nostril pierced between 3 shields. Rostral not entering the nostril, rarely in 

 contact with the frontonasal/ which is as long as broad or a little broader, or 

 longer than broad and in contact with the frontal ; z prefrontals usually forming a 

 median suture, or separated by an azygos shield ; 3 frontal as long as its distance 

 from the end of the snout, i\ to if times as long as broad, a little narrower behind 

 than in front ; parietals i\ to 1 \ times as long as broad ; interparietal iA- to 2 times 

 as long as broad ; occipital small, much shorter than the interparietal, often separated 

 from it by the parietals meeting in the middle. 4 supraoculars, first very small, 



1 In 27 specimens out of 283 examined by Van Denburgh (about 10 p.c). 



2 In a male from Taipeh and in another from Punkiho. 



3 In a female from Punkiho. 



