"^^iVi!' ] PROCEEDINGS OF THE NATIONAL MUSEUM. 605 



Teeth of equal length, posterior oues not channeled ; head depressed^ 

 eyes small; a proniinent rostral, two iuteruasals and two prefrontals; 

 one anterior ocular; a loreal. Anal plate and subcaudal scuta divided ; 

 scales smooth, 



I have referred this genus to the Calamarinne, where it has some 

 affinity to Oontia and to Couopsis. It is a transitional form. Two 

 species are known which differ as follows : 



Yellow with black cross bauds, or aunuli C. occipitalis. 



Browu with darker narrow lougitudinal stripes... C. diasii. 



The G. diasii* Cope has been found in the state of Puebla, Mexico; 

 the C. occipitalis is so far only known from the deserts of the lower 

 Colorado River, Arizona. 



Chionactis occipitalis Hallow. 



Cope, Proc. Acad. Phiia. 1866; p. 310; Check List Batra. Eept. N. Am. 1875, 35. 

 Rhinostoma occipitale Hallowell Proc. Acad. Phila 1854, 95 ; Lamprosoma occipitale 

 Hallow, 1. c. 1856, 310; Baird U. S. Mex. Bound. Survey, 1859, 21, PI. xxr, tig. 1. 



A variety of this species was described by Kenuicott under the name 

 of C. 0. annulatus {op. cit.) based on two specimens from the Colorado 

 Desert. They only differ from the type in the continuance of the black 

 cross bands across the abdomen, forming complete rings. No. 2105; 15, 

 7 : 172, 43 : 350, 64 mm. 



The light color of the specimens of this species in alcohol is yellow 

 in life, with some pink intermixed, forming a handsome combination of 

 colors. 



RHINOCHILUS Bd. and Gird. 



Cat. Rept. N. Ainer. Serpeuts, p. 120 ; Cope, Check List N. Anier. Batr. Rept., 1875, 

 p. 36; Proc. Amer. Phila. Soc, 1886, 487; Bulletin U. S. Nat. Mus., 1887, p. 52. 



Head separated from the body by a moderately contracted neck. 

 Eostral plate produced, but not recurved above. Internasal and pre- 

 frontal plates. Two nasals; nostrils between. On loreal. One anterior 

 orbital. Scales smooth. Postabdominal scutella entire. Subcaudal 

 scutella all undivided. 



Two species of this genus are known, as follows: 



Scales in twenty-three rows; labials eight; tail one-tenth total length. A dorsal 

 series of numerous square black spots separated by red spaces, sides black-varied ; 

 belly white E. lecontii 



Scales in seventeen rows; labials eight; tail one-eighth total length ; a few broad 

 and long cross bauds on body above, extending to the borders of the belly. 



E. antoniiA 



* Proc. U, S. Nat. Mus. 1886, p. 188. Toluca lineata Keun. liinc Couopsis Uneatus Bo- 

 court Mission Sci. de Mexi(iue Reptiles, p. 505, PI. xxv, fig. 4 ; not Tohica lineata Keun. 

 t Dugcs, Proc. Amer. Philos. Soc, 1886, p. 290 ; fom Mazatlan, Mexico. 



