4 ARKIV FÖR ZOOLOGI. BAND 0. N:0 S), 



is more apparent. In consequence of the shape of t lie scales 

 the arrangement in transverse series is less striking at the 

 first look tlian in T. teguixin. On tlie sides the scales are 

 smaller and more granular. To judge from Gunther's 

 figure, it appears to be a great difference in the size of the 

 scales between T. rufescens and this species. The number of 

 transverse series of ven trål plates is about 32, and the number 

 of plates in a series across the middle of the belly about 46. 

 Two series of preanal scales are enlarged, being broader than 

 the ventraJ plates. The limbs are partly covered with granular, 

 partly with flat scales in a similar way as in T. teguixin, but the 

 granular scales of the outer side of the före limb of this new 



species are considerabty lar- 

 ger than those in a corres- 

 ponding situation of an 

 equally large specimen of 

 T. teguixin. On the hind 

 limbs there is no great diffe- 

 rence in the size of the gran- 

 ular scales of the two spe- 

 cies, but those of T. duséni 

 are more convex there as 

 well. The flat scales ha ve 

 ^ about the same distribution 

 Fig. 3. Head of Tuhinanbis duséni on the anterior surface of 



LÖNNB. from the lower side. Nat. size. ^j^^ f^^.^ ^^^^^^ ^^^^ ^^ie infero- 



interior surface of the hind limb of both species mentioned. 

 The femoral pores are about seventeen on either side. The 

 tail is subcylindrical, somewhat compressed in the posterior 

 three fifths. The caudal scales are arranged in regular trans- 

 verse series, they are keeled but not so strongly as in T. teguixin. 

 The scales on the lower side are longer and the arrangement 

 is similar to t hat in T. teguixin in such a way that, regularly 

 alternating, tAvo upper series correspond to one lower, then 

 one upper to one loAver, and again two ujDper to one lower etc. 

 In consequence of this every third upper series is slightly 

 larger than the tAvo between. Of two upper series that corres- 

 pond to one lower it is, as a rule, the anterior that ceases to 

 exist, its members gradually decreasing in size, while the pos- 

 terior is continued directly in the lower series, its members 

 gradually increasing in size. 



