152 bulletin: museum of comparative zoology. 



rows of dorsal scales, and the very slender body and long tail. As is to be 

 expected, these specimens are most closely related to the nearest geographical 

 representative of the group (proxima), and differ from this form but little. 

 The proportionate length of the tail falls well within the limits of variation m 

 proxLa, as do also the number of caudal plates. The number of dorsal rows 

 of scales (19-17) is exactly the same as in proxima specimens. In one of the 

 specimens there are 7 supralabials on one side, which may or may not indicate 

 a tendency toward a reduction in this region, but the number of ventral plates 

 (150 in the only specimen in which they can be counted) is decidedly less than 

 is normal in proxima, which has a range of variation from about 164 to 1/4. 

 Since but one specimen has been examined this small number might be con- 

 sidered abnormal were it not for the fact that Orizaba specimens and Copes 

 type of rutiloris, both of which belong to this group, also possess a smaller 

 number of ventral plates than is normally the case in proxima specimens 



"The creneral type of color is the same as in proxima. The ground color 

 above is "dark greenish olive, the belly light bluish. The lateral stripes are 

 narrow and are situated on the 3d and 4th rows of dorsal scales. The dorsal 

 stripe is rather inconspicuous. The labials are uniformly white (possibly red 

 in life). There are the usual light bars on the preoculars in irout of the eye, 

 and on the lower postoculars. There are no spots on the end of the gastro- 

 ste.es, on the dorsal scales, or labials. Dorsal scales 19-17 in all specimens; 

 supralabials 8; 8; R. 7, L. 8 : infralabials 10; R. 10, L. 11; 10: oculars 1-3; 

 L 2-3,R. 1-3; 1-3: temporals 1-2 in all : urosteges'88 ; 91 ; 81 : gastrosteges 



150; ?'; t" ' . ^ 



26. Coluber triaspis Cope. 



One specimen, young, from Chichen-Itza. _ ■, ■, . r 



Concerning this specimen. Dr. Stejneger very kindly writes under date of 



Oct. 9, 1905: .., .r, ^ en 



" The snake is Coluber triaspis. I have compared it with the types ot 0. 

 flavirufus, muiahilis, and triaspis. It is not the first mentioned ; it agrees 

 exactly with the second, which is probably a synonym of the third. C. triaspu 

 type seems to be an abnormal specimen with 3 loreals and 4 first temporals, 

 otherwise = mutabilis." 



27. Herpetodryas carinatus (Linne). 

 One specimen lately received from Mr. E. H. Thompson. Taken at Chichen- 



Itza, 189-. „ . r 1 



This specimen is interesting in that the median five series of scales are 

 keeled; the median three distinctly, the outer pair considerably less so. 



28. Coronella micropholis (Cope). 

 One example, adult taken at Chichen-Itza on April 6, 1904, by L. J. Cole 

 This is a large example and represents var. B. of Boulenger's Cat. Snakes Brit. 



21 

 Mus., 2, p. 203, 204. Sc 212 + 53. 



