ART. 6 SOUTH AMEIUCAN LIZARDS C. E. AND M. D. BURT 13 



Genus LEIOSAURUS ^ Dumeril et Bibron 



1837. Leiosaurus Dumeril and Bibron, Erp. Geu., vol. 4, i). 241 (type species, 



L. Tjellil Dumeril et Bibron). 

 1S43. Pristidacti/liifi Fitzingee, Syst. Kept., p. 16 (type species, Leioisaurus; 



fasciatus D'Orbigny). 

 1843. Diplolaemus Bell, Zool. " Beagle ", Reptiles, p. 19 (type species, D. 



darwinii Bell). 

 1845. Ptenodactylus Gray, Cat. Liz. Brit. Mus., p. 224 (type species, Leiomurus 



fasciatus D'Orbigny). 



The lizards of this genus are in a state of great systematic con- 

 fusion and a careful study of the species and subspecies is much to 

 be desired. The generic synonymy indicated above, with the ex- 

 ception of the last entry, is after Koslowsky (1896, p. 167). 



Aperoprisfis Peracca, as described, differs little from Leiosaurus 

 Dumeril and Bibron, the differences exhibited by the type species, ^4. 

 paronae, being slight and seemingly of specific rather than of gen- 

 eric nature. Therefore the two genera may ultimately be considered 

 as one. 



LEIOSAURUS BELLII Dumeril and Bibron 



1837. Leiosaurus hcllii Dumeril and Bibron, Erp. Geu., vol. 4, p. 242 (type 

 locality, " Mexique ", no doubt in error). 



Like Leiosaurus catatnarcensis^ this species has a row of isolated 

 dark markings along the middorsal line, but it differs, apparently, 

 in having these markings more elongate or pointed before and behind, 

 in possessing slightly smaller dorsal granules, and in the absence of 

 a more or less developed dorsal denticulation. The two forms are 

 obviously very closely related and will probably be found to be sub- 

 specifically allied by subsequent vforkers. 



Argentina. — Two specimens > from Chubut Province, Patagonia, 

 Nos. 22737-38, received from Museo de la Plata. 



LEIOSAURUS BIBRONII (Bc!l) 



1843. Diplolaemus bibronii Bell, Zool. "Beagle", Reptiles, p. 21, pi. 11 (type 



locality, Port Desire, Patagonia). 

 1885. Diplolaemus darwinii Boulenger, Cat. Liz. Brit. Mus., vol. 2, p. 126, 



(part: types) (not of Bell). 



Stejneger (1909, pp. 221-223) has indicated that L. hihronii and 

 Z. dariomii are separable on the character of the scutellation and 

 coloration, the former having larger scales on the head and a 

 different color pattern. 



Argentina. — Eight specimens, Nos. 36939-41 and 36944-48, col- 

 lected in 1898 by J. B. Hatcher in Patagonia, " about margin of 

 small salt lakes." 



* The generic name " Leiosaurus " Dumgril and Bibron was emended by Boulenger (1885, 

 p. 124) to read " Liosaurus." In accordance with article 20 of the International Rules of 

 Zoological Nomenclature the original orthography is retained. 



