104 PROCEEDINGS OF THE \ ITIONAL MUSEUM. vol.38 



Genus PSEU DOX E NODON Boulenger. 



1830. Xenodon Wagler, Syst. Amph. p. 171 (type, X. inornatus Hoik) (not of 



Fitzinger, L825). 

 L890. Pseudoxenodon Boulenoer, Fauna Brit, [ndia, Rep., p. 340 (type, 



/'. macrops). 



PSEUDOXENODON STEJNEGERI Barbour. 



190s. Pseudoxenodon stejnegeri Barbour, Bull. Mus. Comp. Zool., Cambridge, 

 vol. 51, no. 12, p. 317 (type-locality, Mounl Arizan, Formosa; type, No. 

 710::, M. C.Z. C; Owston collection); Proc. New England Zool. Club, 

 vol. I, Nov. 24, 1909, p. 67, pi. 7, fig. 8 (type). 



Only a single specimen from Mount Arizan, Central Formosa, was 

 taken November 29, 1006. The species, according to its original 

 describer, is related to Pseudoxen odon dorsalis from China. 



Genus M ACROPISTHODON Boulenger. 



1893. Macropisthodon Boulenger, Cat. Snakes Brit. Mus., vol. I, p. 265 (type, 



1/ flavia ps). 

 L909. Pseudaghistrodon Denburgh, Proc. California Acad. Sci. - I , vol.3, Dec. 20, 



L909, p. 51 (type, /'. carinatus). 



The chief difference relied upon to distinguish Pseudaghistrodon 

 from MacropistTiodon is the lack of interspace between the anterior 

 maxillary teeth and the posterior large fangs, a character scarcely 

 sufficient in the present instance. 



MACROPISTHODON CARINATUS (Denburgh). 



L909. Pseudaghistrodon carinatus Denburgh, Proc California Acad. Sci. (4), 

 vol. 3, Dec 20, L909, p. 5] (type-locality, Formosa; type, Cal. Acad. Sci., 

 No. L8003). 



In addition to the type which seems to have no definite locality 

 attached to it, specimens are recorded from Toroku and Mount 

 Arizan, cent ral Formosa. 



Apparently the present form is very closely allied to the Chinese 

 species M. rudis, which is recorded from Fokien and Yunnan. It 

 agreeswith it in the very strongly keeled scales, the keeled temporals, 

 and in the presence of suboculars. The scale formula is also sub- 

 stantially alike in the two species, except that in the Chinese speci- 

 mens recorded the scale rows are 25, but in the Formosan 23. 



ACHALINUS FORMOSANUS Boulenger. 



L908 Ichalinus formosanus Boulenger, Ann. Mag. Nat. Bist. (8), vol. 2, Aug. 

 1908, p. 222 (type-locality, Punkiho, Kagi district, Central Formosa; type 

 in Brit. Mus.; Doctor Moltrecht, collector). 



Beyond the type-specimen nothing is known of this interesting 

 addition to the Formosan fauna. In spite of its large number of scale 

 rows ii .appeals to l„- mo re nearly related to .1. spinalis than to 



.1. rufesci ns. 



