On the Affinity of the North- American Lizard-Fauna. 107 



thighs and lower surfaces uniform pale brownish. Male with 

 internal vocal sacs. 



From snout to vent 26 millim. 



A single male specimen {R. Baron). 



EXPLANATION OF THE PLATES. 

 Plate V. 



Fig. 1. Uroplates phantasticus. 



Fiy. la. Ui-oplates phantasticus. Side view of head, X 2. 



Fit/. 2. Chamcehon (jastrotcBnia. 



Fiy. 3. Coronella torquata. Upper und side view of head and anterior 

 part of body. 



Fig. 4. Coronella microps. Upper and side view of head and anterior 

 part of body. 



Fig. 5. Dromicus Baroni. Side view of head and lower view of segment 

 of body. 



Fig. G. Langaha intermedia. Side view of head and lower view of ros- 

 tral appendage. 



Plate VI. 



Fig. 1. lihacophonis albilabris. 



Fig. 1 a. lihacophorus albilabris. Open month. 



Fig. 2. Mantella Baroni. 



Fig. 8. Platgpelis poUicaris. 



Fig. 3 a. Platgpelis poUicaris. Open month, X 2. 



XIV. — On the Affinity of the North- American Lizard-Fauna. 

 By G. A. BOULENGEE. 



In my paper " On the Geographical Distribution of the 

 Lacertilia," published in the 'Annals' for August 1885, I 

 made the following remarks : — " The Neogean Eealm may, 

 in this summary review, be described in few words. Its 

 fauna is very uniform as regards groups of higher rank, and 

 the changes from tlie centre towards the North and South are 

 very gradual. And it is noteworthy that the Central-American 

 fauna (of which the North-American is but an offshoot) 

 presents a greater variety of types than South America ; 

 thus it possesses representatives of every one of the eleven 

 families which occur in the realm, viz. Geckonida?, Eublepha- 

 ridffi, Iguanidee, Xenosauridse, Anguidae, Aniellidse, Heloder- 

 matidge, Xantusiidse, Teiidge, Amphisbjenid^, and Scincidse; 

 whereas South America lacks tlie small groups Eublepharidae, 

 Xenosauridse, Aniellidfe, Ilelodermatidae, and Xantusiidae. 



