"'ihm!' ] I'KOCEKDlNfJS OF THK NATIONAL MISKCNf. 593 



lUi. K\«^ restiiijj on labials on <iiio HitU-. aiiil nut on the oilier. 



Loll III present, No. n'.U. 

 UBIJ. J'.vi' sijiarateil iVoni lahialM on iMitii Miles. 



Lonal.s, one on one side, two on the otlier. -'.••J'i. 



Loreals, one on each Hi<le, l>".i.'>r>. 



Loreulf, uone, 44'J2. 



None of the Xortli American specimens have the iiiteniasals separated 

 on the miihUe line by a scale, as is stated to be the casj' in the type of 

 C. botf(V by Bocourt. Several have the prefrontals separated by scales, 

 however, so that the character of the type specimen is ]»r<>bal>ly oidy 

 an individual \ariation. There is no reason to suppose that the I'ppcr 

 California species differs from that of Lower California. 1 ^'ive the fol- 

 lowinj,^ notes which I took from l)e lilainville's tyi»e in the Museum of 

 theJardin des IMantesin 1.SG4, by permission of Prof. Au<;uste Dumeril : 

 "The tail enters the total len^rth 0^ times. Frontal much wider tliaii 

 lon;,^ postnasid and loreal lon<.'er than wide. One preocular. Ten 

 superior hibials : second and third touching loreal; fourth, fifth, and 

 si.xth entering- orbit. Forty-three rows of scales, size ^^raduatini,^ smaller 

 from first to third. A reddish tint in tlu' pale brown of the belly ; above 

 slaty brown."' The specimen a^^reed in si/e and character with the one 

 described by De Blainville, and I am therefore at a loss to umierstand 

 the accounts oiven by .Fan an«l liocourt. The former says* there are 

 but thirty-nine rowsof scales on the body, and the latter says, perhaps 

 by a typojjraphical error, 2*0. Bocourt also says that at the period 

 of his writinu, IS8L' (Mission Sci.de Me.xique, ."ill'), the spetriiuen was no 

 lon<;er in f;ood condition. It was in jioitd condition at the time of my 

 examination in 18iil. 



The WcnoHd imihclla does not api)ear to nie to dilfer specifically from 

 the other forms. Itshe;id plates displa\ a pecidiarity which is also seen 

 in a specimen from California. (See table above). 



This species ran;;es throu;;hout the entire Pacific <listrict, as well as 

 the Lower Califonnan. The most eastern point from which the Smith 

 soniaii Institution has juocur«'d specimens is the.Iohn Day River. ( )re- 

 •4:on. It has been also olttained in the Creat ISasiu, on the Ilundioldt 

 iiiver, Nevada. 



COLCHIMD.F. 



CHILOMENISCUS Copo. 



I'roc. Aeail. I'liila.. IHU). p. :{;{;>. Mull. 11. .S. \af. Muk. No. 3-2. 1.-X7, p. .^3. /.'m/fmu 

 Steintlailiner, Voyage of tlie Novura. v, IdTCi, p. 'JJ 



Form stout, Ixxly cylindrical, the head not disiinci. .Mu/./,le roumhd, 

 \ery prominent, and much depressed. I*c»stral plate lar^'c. with an e.\- 

 tensive superior surface and presenting; an obtuse an;j:le between the 

 prt'froutals; the inferior surfa«'e ijreatei- than the superior, owiji;; to tlie 

 backward position of the manilil»le. I lend shields broad, nornial, except 



* Arrlii\. 1. .Nai Hi ;ii^> II H ill"-, i^oJ, 1. p. ■J4». 



Proc. N. M. 91 36 



