198 



NORTH AMERICAN FAUNA. 

 List of specimens of Gerrhonotus bin-net Hi. 



[Xo. 



u. s. 



Nat. 

 Mus. 

 No. 



Sex ai'd 

 age. 



Locality. 



Alti- 

 tude. 



Date. 



Col lector. 



Remarks. 



18605 



cfj«n. 



Monterey, Calif. 



Feet. 



Sept. 29 



Bailey 



Family Xantusiid^:. 



Xantusia vigilis Baird. (PI. in, fig. 1). 



The present species was described in 1858 by Prof. Baird from spec- 

 imens sent home by Xantus from 'Fort Tejon,' Calif. Nothing has 

 been published concerning it since then, and this, perhaps our most 

 interesting lizard, has also been one of the rarest and supposed to pos- 

 sess a very restricted range. 



Two additional specimens are now before us, one collected by Dr. 

 Fisher at Hesperia, on the south side of the Mohave Desert, on Jan- 

 uary 4, 1891, while Mr. Palmer secured the other on February 24, in 

 Pahrump Valley, Nevada, thus extending the range of the species 

 nearly 200 miles eastward. The type locality, Fort Tejon, is in an 

 open canon — the celebrated Canada de las Uvasof the early exploring 

 expeditions — connecting the west end of the Mohave Desert with the 

 San Joaquin Valley. The fauna and flora of this canon present a mix- 

 ture of Mohave Desert and interior valley forms. 



• In all probability this species is more or less nocturnal in habits, 

 which may account for the scarcity of specimens collected. 



Both specimens are somewhat larger than the largest of the types, 

 and, judging from the condition of the femoral pores, I take them to be 

 adults. 



There appears to be some slight variation in the shape of the indi- 

 vidual head shields and in the shape of the head, the Death Valley 

 expedition specimens having it somewhat more elongate; but the differ- 

 ences are not greater than between the type specimens themselves. 



List of specimens of Xantusia vigilis. 



U.S. 



Nat. 

 Mus. 

 No. 



Sex and 



age. 



Locality. 



Alti- 

 tude. 



Date. 



Collector. 



Remarks. 



18618 





Pahrump Valley, Nev 



Hesperia, Mohave Desert, Calif 



Feet. 



Feb. 2* 







18619 



3,200 



Jan. 4 



Fisher 



PI. Ill, fig. 1. 



Family Tejidje. 



Cnemidophorus tigris B. & G. 



All the Cnemidophori brought home by the expedition oeiong to one 

 species, those from the deserts of the Great Basin in California, Nevada, 



