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148 BULLETIN 34, UNITED STATES NATIONAL MUSEUM. 



Metxnitremi'iits of So. "J 147. 



M. 



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Total leiif^lli y.^^ 



Lt-iigtli ol' lu'iid iiiid body ' 



Length to groin ^'^^^^^ 



Longth toiixilhi - • ; 



Length to lino of rictus oris 



Length to line of oy^i ' 



Length ot »ore-U<g ^^^.^^^ 



Length of Corefoot ' ' 



Length of hind leg "' 



Length of hind loot ^^ 



Width of hciid ""'^' 



Width hetweon eyes "•'"'-'•' 



Colorabovc, iiiiifonn diuk redtlislibrowii ; below, imifonii li{>lit brown. 

 I liiive seoii but one siteciiiR'ii of this si)ecies, as follows: No. 9147; 

 California; Ih: J. G. Cooper, collector. 



PLETIIODON OKEGOXEXSIS (liriinl. 



Cope, Proe. Ac. I'hila., 1809, p. 100; lioulenger, ("at. Hatr. Orad. Hrit. 

 Mns., eil. II, iSrJ, p. .>!. 



i:nx(iliiiti v>irhxrhoIt:ii, Gray. Cat. I5atr. (irad. Urit. Miis., ed. i, p. 4S (iter Triton lunnliix. 



Escli.sch.). 

 Uircdia onuoiieiish, (lirtuil, I'roc. Ac. I'hiia., If'M, p. '-iXt, and II. S. Expl. Exped.. 



Her]... I'l. I. lig. IH-','."); Ktraiich, Salani., p. "ti; Hallow., I'roc. Ac. I'liiia , IH.'.t;, 



p. 'J:!;'). 

 rivthodon ciisaliiK, Cope, I'roc. Ac. I'liila., HOT, \k l(i7. 



This species may be readily known by its relatively short and slender 

 tail, its lono;, weU-develo[)ed liinl)s, and wide head, as well as by il.> 

 delicate coloration. 



The form of the body is rather depresse<l, with distinct head and tail. 

 The width of the head enters the lenj^th to the j;roin in the larj^est in 

 dividuals ~>.'SS times; in th().se of medium size, 4.a times; in the youii},' 

 of 17.") lines in length it enteis ;i.."» times. Costal folds II, the an 

 terior indistinct or wanting, the po.sterior nunx! than usually obliiiue, the 

 inguinal extending forwaids and upwards one si)ace in advance «»f the 

 originof the femur. The limbs appre.s.setl overlap, sothat the lingers reach 

 the bases of the tot^s. There is no vertebral groove. The tail is slightly 

 compressed, more distinctly so towards the extremity, and, what is excep- 

 tional and (!liar;i(;teristic of this spe(!ies and the /'. rroaatcr, most so in- 

 ferioily, leaving the nppi'r outline Hat for the pr(»ximal two-thirds the 

 length. The postorlntal fold is well marked and (Mtntinnes into the 

 traiisver.se fold of the tliroat. The head is oval, and without <!anthns 

 rostialis; the mn/./.U\ rather thick, and with a suinnfeiior truncation, 

 which is not so imirked as in J\ cnx-ntter. The. nostril is terminal and 

 nearer the orbit than the diameter of the ey»' li.ssnre. The latter enters 

 the width between the anteiior (ianthi of the smne !..'?.'{ times. 



The inner nares are very small. The voineriu(^ arcs curve backwards 



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