LÖNNBERG & ANDERSSON, A NEW LIZARD AND A NEW FROG 5 



The dimensions of some parts of the new species differ 

 rather strongly from the corresponding ones of Twpinambis 

 feguixin, as a direct comparison of some measm^ements pro ve. 

 The distance from the tip of the snout to the vent is in the 

 specimen of Tupinamhis duséni about 269 mm., and the 

 length of the tail measured from the vent to the tip is 451 mm. 

 The length of the tail is thus 167,7 7o of the length of head 

 and body. As the corresponding percentage for Tupinambis 

 teguixin appears to be from 190 to 200, T. duséni proves to 

 ha ve a comparatively shorter tail. 



For the comparison of some other dimensions a specimen 

 of Tupinamhis teguixin has been used Avhich has a length 

 from snout to vent of 287 mm. The difference in size between 

 t lus and the specimen of Tejns duséni is thus only 18 mm; 

 or 6 °/o of the length of the latter. A direct comparison of tlic 

 measurements may thus be undertaken without being mislea- 

 ding. 



T. duséni T. teguixin 

 Uistanco from snout to anterior börder of tympaiiuin 63,5 inm. 63 mm. 

 » » » ;> )> corner of eye-opening 31 » 33 « 

 « » postorior corner of eye-opening to bör- 

 der of tympanum 23 » 1U,5 » 



Vortieal lieight of temporal region from corner of 



mouth to canthus temporal is 21 - l'J » 



Distance betwesn outer edges of tliiid supraoculars 22,5 » 24 » 



Breadth of frontal shield anteriorly 5 » 10 » 



These measurements prove that the new species has a 

 shorter nose — and it looks much shorter than it is; in conse- 

 quence of the curved contour-line — •, but a larger temporal 

 region than T. teguixin. The latter fact appears to stånd in 

 connection witli a more powerful developement of the muscu- 

 lature of the jaws. In correspondence to this T. duséni has, 

 as it seems, a much thicker and more muscular neck, than 

 T. teguixin. The new species has a narrower interorbital 

 region and a strikingly narrow frontal shield . 



On the other hand the jaws are much broader and stronger, 

 \\liich is most conspicuous when the head is seen from 

 below (fig. 3), but also easily proved by exact measurements. 

 The width of the head at the 7th labials is 39 mm. in T. du- 

 séni but only 31 mm. in T. teguixin. The Avidth of the head 

 at the suture between fourth and fifth labials is in t be former 

 25,5 in the latter 22 mm. 



With regard to this broadness of the jaws T. duséni ap- 



