74 



PROCEEDINGS OF THE NATIONAL, MUSEUM 



VOL. 6& 



consequently it was thought 

 best to use a trinominal ap- 

 pellation for one of them. The 

 additional ten Chinese speci- 

 mens obtained since then and 

 listed below fail to bridge 

 that gap. However, the slight 

 gap between the subcaudals, 

 namely, 66 minimum in N. 

 tiginnus and 6-i maximum in 

 N. lateralis is bridged by no 

 less than three specimens. In- 

 tergradation, as expected, has 

 thus been established, and the 

 use of a trinominal for the 

 Chinese form fully justified. 



An additional specimen Xo. 

 65942 from Suif u has been sent 

 by Kev. D. C. Graham. The 

 scale formula is : sc. 19 ; v. 

 153; a. 2; subc. 57; supral. 7; 

 oc. 2-f; t. 1-1-2. It will be 

 noted that both Szechwan spec- 

 imens have one anterior tem- 

 poral. Moreover, they show^ the 

 characteristic color and pattern 

 of this subspecies; they have 

 nothing to do with Natnx 

 hmideli (Werner). 



Genus PSEUDOXENODON 

 Boulenger 



1890. Pseudoxenodon Boulen(!ER, 

 Fauna Brit. India, Kept., p. 

 340 (type, P. macrops 

 (Blyth)). 



PSEUDOXENODON MACROPS (Blyth) 



1854. Tropidonotus macrops 

 Blyth, Journ. Asiat. Soc. 

 Bengal, vol. 23, no. 3, p. 296 

 (type-locality Darjiling, Him- 

 alaya ; cotypes in Mus. Cal- 

 cutta ; Capt. W. S. Sherwill, 

 collector). — Pseudoxenodon 

 macrops Boulenger, Fauna 

 Brit. India, Kept., 1890, p. 340 

 (Eastern Himalaya, etc.) ; Cat. 



