2 ARKIV FÖR ZOOLOGI. BAND (). N:0 9. 



teguixin as will be shown låter on. T. dnséni may be de- 

 scribed as follows. 



A Ttqnnamhis with rather short preorbital region of the 

 head, and with rather strongly curved profile contour of the 

 nose (fig. 1). The nasals form a suture behind the posterior 

 angle of the rostral wliich has an extension similar to the same 

 in T. tegiiixiri, not so short as in T. rufescens according to 

 OijNTHER's figure. The internasal is large (fig. 2). A pair 

 of pref rontals, each of Avhich has nearly the same size as the 

 internasal. The f rontal is elongate, longer than the pref ron- 

 tals but narrower than they are, except at the middle where 



Fisj. 1. Hoad of Tupinamhis diiséni Lönnberg from the sido. Nat. size. 



it is broadest and as wide as the pref rontals. The f rontal 

 is comparatively smaller than in T. teguixin as it is not so 

 broad as the second supraocular. The frontoparietals are 

 small, not as large as the second supraocular. The inter- 

 parietal is longer Imt not broader than the frontoparietals. 

 Unlike T. rufescens, according to Gunther's figure, the parie- 

 tals are mucli larger than the interparietal. The occipitals 

 are, unlike in both the quoted species, rather large so that 

 only f our in a transverse series are in contact with the posterior 

 börder of the parietals and the interparietal (about 9—10 in 

 T. teguixin); behind those four, some larger and smaller plates 

 or scales form other series. Of the four large supraocular? 

 the second has the greatest size, but it is not muchlaiger than 



