1883.] NATURAL SCIENCES OF PHILADELPHIA. 29 



Specimens remarkably large, and with the postinguinal black 

 spot unusually large and distinct. DeCorse. 



Gerrhonotus multicariaatus Blv. Rust. 

 Eumeces skiltonianus Bd. Rust, DeCorse. 

 Ophibolu3 getulus boylii B. and G. Rust. 

 Fityophis catenifer Blv. Rust, DeCorse. 

 Bascanium testaceum Say. Rust, DeCorse. 

 Eutsenia hammondi Kenn. DeCorse. 



Note on a Species of Xantusia. 

 The species described below was found by Dr. J. Gr. Cooper, 

 Zoologist of the State Geological Survey of California, and was 

 placed in the collections of the University of California, where I 

 saw it. It was kindly lent me for examination by the authorities 

 of the University. The locality from which the specimen was 

 derived is unknown, beyond that it is Californian. 



Xantusia riversiana Cope. American Naturalist, 1879, p. 801. 



The position of this genus in the system has been discussed 

 by M. Bocourt ^ and myself.^ I associated it with the genera Lepi- 

 dophyma Dum., and Cricosaura Peters, and stated that 1 was not 

 able to distinguish them from the family Lacertidae. M, Bocourt 

 places these genera in the family " Trachydermi," which also 

 includes Heloderma Wiegm. This family is divided by M. Bocourt 

 into two subfamilies, the Glyphodonti for Heloderma, and the Agly- 

 phodonti for the three genera named, together with Xenosaurus 

 Pet. Previously to this ^ I had examined and compared the 

 osteology of Heloderma and Xenosaurus. On account of the 

 differences in the form of the mesosternum, and in some other 

 points, I regarded Xenosaurus as the type of a peculiar family to 

 be placed with the Helodermideein the tribe Diploglossa. Xantusia, 

 Lepidophyma and Cricosaura are, on the other hand, not Diplo- 

 glossa, but are Leptoglossa. They are allied to the Lacertidae, and 

 especially to the Asiatic Ophiops, which is, like them, without eye- 

 lids. The character of the tongue is like that of the Ecpleopidse, 

 uniformly squamous, and has no resemblance to that of the 

 Diploglossa, The characters of the scapular arch are those of the 

 Leptoglossa. The clavicle is loop-shaped proximally, and the 



1 Misiou Scientifique de Mexique, Herpetology, p. 303, 1878. 

 '^ Proceedings of the Academy of Philadelphia, 1864, p. 229. 

 3Loc. cit. 1866, p. 322. 



