294 A - G - RUTHVEN. 



row ring of black ; as is also the nostril. There is also a black 

 line between the preocular and loreal. Chin white. Throat 

 yellowish. 



The specimen upon which I have based the above descrip- 

 tion as being typical of the form, since I have been unable to 

 examine the type, is a specimen taken on the bank of the 

 Huron river, near Ann Arbor, Michigan, by myself, September 

 22, 1903 (U. of M. Mus. Cat. No. 30642). It is not a mature 

 specimen, and for this reason the color pattern is more distinct 

 than in older specimens, for the ground color tends to become 

 darker and to obscure the spots in adults. This is the only 

 difference except in size to be observed between old and young 

 specimens. 



VARIATION. 



Contrary to the usual tendency among the species of En- 

 tcznia, the specimens of bittlcri, which I have examined, show 

 but little individual variation from the type as described by 

 Cope, or the specimen which I have chosen as being most 

 nearly normal. It is an interesting coincidence, that all the 

 specimens previously recorded (Phila. Acad. of Sci. Cat. No. 

 6523, U. S. N. M. Cat. No. 21692, and Purdue Univ. Cat. No. 

 (type) 264), possess 7 supralabials on either side, while in the 

 specimens which I have examined these are nearly always 66, 

 but occasionally 6-7 and in three cases 77 ; when there are 6 

 supralabials, the fifth is always the largest ; when there are 7, 

 the extra one is apparently formed by a divison of the fifth, as 

 may be seen in two cases (U. of M. Mus. Cat. No. 30683 and 

 30506), in which the fifth is only partially divided. The supra- 

 labials are nearly always 88 ; in two cases (U. of M. Mus. Cat. 

 No. 30471 30407*2) they are 99, and in one case the extra one 

 is on one side only. The oculars are normally 1-3, with an oc- 

 casional variation to 12. Concerning the disputed second tem- 

 poral, there is in most cases a single large temporal in the second 

 row, as is given by Prof. Cope for the type. When there are 

 two, the upper is always very much the smaller, and generally 

 so much so as to be surrounded by the lower on the lower and 

 posterior sides. In specimen No. 6523b Phila. Acad. of Sciences, 

 the lower one of the second row seems to have divided length- 



