CROCODILIANS, LIZARDS, AND SNAKES. 



951 



l^art frontal witli the labials opposite this part (except their lower edges) 

 black. 



This species is somewhat similar to the C. stramineus cinctus Cope, 

 but differs in the posterior production of the postnasal plate to the 

 preocular, so as to ])revent the junction of the prefrontals and labials. 



In the Tucson specimens the dorsal spots invade the first row of 

 scales as in the type. 



Cat. No. 8897 ; upper labials, 7 ; gastrosteges, 113 + 1 ; urosteges, 28 ; rows of scales, 

 13; total length, 120 mm. ; tail, 16 mm. 



Chilovieniscus ephippicus Cope. 



Catalogue „^/-b- 

 mens. 



8897 

 15788 

 15789 

 15790 

 16806 

 21539 



Locality. 



Arizona Valley, California.. 

 Tucson, Arizona 



-do 



San Fernando, Lower Cali- 

 fornia. 



From whom received. 



Kature of specimen. 



G. H. Horn, M. D 



Herbert Brown. 



P.L.Joiiy 



A. W. Anthony. 



Alcoholic, 

 do. 



do. 

 do. 



Of three specimens from Tucson, Arizona, Cat. No. 15788, the largest, 

 has the j)ostnasal separate from the preocular, although not far removed ; 

 in Cat. No. 15789, a much smaller specimen, the arrangement is the 

 same, while in Cat. No. 15790, which agrees witli Cat. No. 15789 in 

 dimensions, the posterior angle reaches the preocular as in the type. 

 In the type of G, fasciatus the two plates are more widely separated 

 than in Cat. No. 15789. 



CHILOMENISCUS FASCIATUS Cope. 



Chilomeniscus stramineus fasciatus Cope, Proc. U. S. Nat. Mus., XIV, 1892, p. 595. 

 Chilomeniscits cinclits Cope, Yakrow, Check-list N. Amer. Batr. Rept., 1883, p. 

 86; not of Cope. 



This species resembles the C. ephippicus in general appearance, but the 

 scutellation is very different. In the wide separation of the nasal and 

 preocular plates it resembles the G. 

 stramineus^ but it differs from both 

 species in the more numerous infe- 

 rior labials and larger pregeneials. 

 Thus, while in these there are but 

 three labials iu contact with the 

 pregeneials, there are in the G. fas- 

 ciatus four or five of these plates 

 in contact with the pregeneials. 



Two specimens are in the U. S. 

 National Museum collection; one of these has twenty four and the 

 other twenty-six black cross-bauds on a white ground. Of these four 

 in one and five iu the other are on the tail. They are two scales long 

 and eleven and two half scales in width ; the spaces between them two 



Fig. 244. 



Chilomen'iscus fasciatus Cope. 



La Paz, Lower California. 



Cat. No. 1 5030, U.S.N. M. 



