1585.1 '^"* [Cope. 



most common arrangement. The food of both these species is the Rana 

 montezumcB Baird, and another species allied to R. halecina. The life of 

 this lake is in other directions exceedingly prolific, especially in fishes and 

 in minute Crustacea. 



EuT.,ENiA PULCHRiLATUS Cope. Proceeds Amer. Philosoph. Society, 

 1885, p. 174. 

 This species turns out to be widely distributed in Mexico. Besides the 

 localities already mentioned in this paper, Mr. Hoege sends it from either 

 the valley of MexicO; or the adjacent one of Toluca. 

 EuT^NiA FLAYiLABRis Cope. Same locality.* 



Toluca lineata Kenn. A specimen displaying the typical characters, 

 among others those of the genus Toluca, in the extension forwards of 

 the frontal to the interuasal plates. Same locality. 

 Tantilla calamarina Cope. Same locality. 



EuMKCES BREViKOSTRis Gthr. var. A specimen which difiers much from 

 the typical ones in coloration. The light lines are very narrow, so as 

 to be separated by four rows of dorsal scales ; and the adjacent edges 

 of the latter are traversed by a blackish line, giving five longitudinal 

 lines for the back. The inferior light line is bordered below by black- 

 ish, and below this, two rows of scales have dark adjacent edges, 

 forming lines. Same locality. 

 Hyla arenicolor Cope. The same region. 



IV. COZUMEL ISLAND. 

 This island is off the east coast of Yucatan, and measures twenty- four 

 miles in length. It was recently visited by the U. S. Fish Commission 

 steamer Albatross, and a fine Natural History Collection was made there. 

 The number of reptiles collected is small ; the following is a list of them : 

 BuFO agua Daud. No. 13,907. 

 Aristelliger irregularis, sp. nov. 



Head rather elongate, narrow to the muzzle. Superior labials nine to 

 the posterior border of the orbit, the seventh and eighth below the middle 

 of the orbit. The symphyseal plate large, with a triangular plate on each 

 side below the first labial, which is the first of a diminishing series of three 

 scales, the fourth being about equal to the adjacent ones. Two small plates 

 connect the lateral triangular ones. Scales of throat and head above mi- 

 nute ; those of the dorsal region of the same and larger and smaller sizes 

 Irregularly mixed ; all rounded and convex in form. The larger ones pre- 

 dominate on the sides. Thoracic and abdominal plates small, smooth ; 

 twenty -three longitudinal rows on the belly. A short palpebral spine 

 over the eye. LamellfE of penultimate digit sixteen. The legs are short, 

 the hinder limb pressed forwards reaching the axilla. 



The color is said by Mr. Ridgway, the distinguished ornithologist, who 

 ♦Allied to Eutrenla is Ctiilopoma Cope (Rept. U. S, G. G. Surveys, W. of 100 

 Meridian, G. M. Wheeler, vol. v). This name is preoccupied and may be 

 changed to Stypocemus. 



