ART. 6 SOUTH AMEEICAlSr LIZAEDS C. E. AND M, D, BURT 1 1 



Genus LEIOCEPHALUS Gray 



LEIOCEPHALUS ARENARIUS (Tschudi)' 



1845. Steironotus arenarius Tschudi, Fauna Peruana, Herpet., p. 25 (type 



locality " Huacho, nordlich von Lima", Peru). 

 1901. Lioceplialus rJiodogaster Boulenger, Ann. Mag. Nat. Hist., ser. 7, vol. 7, 



p. 547 (type locality "Merced, Pereiie River," central Peru). 

 1907. Liocephaliis arenarius Rous, Revue Suisse Zool., vol. 15, p. 300. 

 1921. Leiocephalus arenarius Bakboub and Noble, Proc. U. S. Nat. Mus., vol. 



58, p. 612. 

 1921. Leiocephalus ervingi Bakbour and Noble, Proc. U. S. Nat. Mus., vol. 58, 



p. 612 (not Stenocercus ervingi Stejneger, 1913). 



In describing this lizard as rhodogaste?', Boiilenger (1901) con- 

 sidered it to be " most nearly related to L. erythrogaster " of Colom- 

 bia, although the nearest geographical representative of its genetic 

 section of the genus appears to be L. ornatus ornatus of Ecuador. 

 In fact it seems but slightly differentiated from the latter form, 

 having its reduced head plates and small dorsal scutes as well. 



Roux (1907) is followed in finding rhodogaster to be synonymous 

 with arenmmis^ but it is apparent that Barbour and Noble (1021) 

 were not correct in regarding L. Kneogularls Werner (1901) as 

 another synonym. 



Stenocerus ervingi was described from southern Peru by Stejneger 

 (1913), but was later (1921) regarded as Leiocephalus ervingi by 

 Barbour and Noble, who, without examining the type, wrote that 

 '' This specimen was only 81 mm. in total length, and the generic 

 characters were difficult or impossible to discern. We have before 

 us a single adult (U.S.N.M. No, 60742), which we believe to be a 

 Leioccplialus^ owing to the presence of abdominal ribs and of general 

 Leiocephalus squamation. It is beyond doubt the adult of Stejne- 

 ger's species." An examination of all of the specimens concerned, 

 including the type of ervingi and those younger examples referred to 

 Leiocephalus arenarius by Barbour and Noble, shows Stejneger's 

 species to be correctly diagnosed, and also shows that the Leioceph- 

 alus ervingi and the Leiocephalus arenarius of Barbour and Noble 

 are identical. 



Peru. — Five specimens, Nos. 60811 taken at Toranton at 8.500 

 feet elevation on May 1, 1915, and 60705-706, from Chospiyoc on 

 the Huarocondo River taken at 10,000 feet elevation on April 20, 

 1915, No. 60742 from Machu Picchu on Oct. 30, 1915, at 8,000 

 feet, and No. 60810 from Ollantaytambo on May 15, 1915, this one 

 secured by O. F. Cook, the first four secured by Edmund Heller, for 

 the Yale-Peruvian Expedition, 



"This species should not be confused with "Lioceplialus arenarius" Barbour (1916), a 

 form described from Bastion Cay, TurliS Islands, W. I., and later renamed LeiocepJialua 

 paammodromiis Barbour (1920, p. 73). 



