"■^^'^'J PKOCKKDIXGS OF TMK NATIONAL .Mrsi;iM G U> 



mar<;ins, and is leciuxt'd on tliosiiiuiiiit oftlu* mii/zlc. 'I'wk nazals. Viv 

 oiMilardividcd. iScalcs smooth, bilossatc. Anal and subcaudal sciUtdhi 

 di\ idc'd. Tt't'tli laij^er posteriorly. I'upil round. 



This genus is more like the Lytorhynchus of Peters, of Afriea and 

 the adjacent [tarts of Asia, and like it, it inhabits, as to its typical foi in, 

 thu iS. <jrah((mia., i\\\ ;iiid rock> rej^ions. It has the same peculiar ex- 

 panded rostral plate as tlu' ^^enus riiyllorhynchus Stejn.. and displays 

 a similar tendency to division of the lateral head shields, 'riirt-e species 

 of Salvadora ai«* known, all of which are (bund witjiiu the political 

 limits of Mexico, and on(^ of them (iS. (jitihii»iiii\ ticcius also In the 

 Sonoran region within the United States. 



I proposed {loc.cit.) to change tlie name of this genus, because it hail 

 been previously given by Linnauis to a genus of plants. As it is not 

 now regarded as necessary to maintain unitbiin ditferenc*' between 

 l)lant and animal generic names, 1 have recurred to the name of liaird 

 and (lirard. 



The species ditler as follows : 



I. Tail oiie-fonrtli of total leiif^th or shorter; siiporior laliial ))lateK eight. 



Kostral plate wider, more free laterally; temporal scales 2, 3, l ; bluish or yel- 

 lowish, with a brown stripe on each side of a yellowi.sh dorsal stripe. 



.V. t/rahaniin: 

 Kostral plate narrower, iesa free laterally ; temporal scales 2, 2, :> ; olivaceous, 

 with two brown stripes on each side of a narrow light brown dorsal stripe. 



^'. hdirdii. ' 

 II. Tail oue-tliird lengtii : superior labial jtlatts nine. 



Rostral plate narrower, less free at the sides; temporal scales 2-2-2. Yellow- 

 ish, with two brown liands on each side of a dorsal stripe, anteriorly broken 

 up into parallel narrow linesand crossed by brown cross bars near the heail. 



N. mcjicfldfl.t 



All ol the species have seventeen longitudinal rows of scales. 



Salvadora grahamiae Hd. and Gird. 



Cat. Serp. N. Araer., 1«5:{, p. KM ; Haird, U. S. Mex. Hound. Survey, ii, IST/.l. Kep- 

 tilia, p. 21, PI. V, Fig. 2; Cope. Hull. V. S. Nat. Mus. :VJ. H-T. p. 72; .Ian. Icon. 

 (Jen. Ofidi. Livr. I, IM. ill, Kig. 2. 



rhimotliyra (Jrahalnia^Vo]^e, Proc. Acad. Phila., IdCO, p. :{04 : Check List Batr. Kept. 

 N. Amer., 1^7.'), p. :<8. 



(yonsi<lerable variations are presented by this species. Thus in two 



specimens (4()73 and 447b) a narrow brown band extends along the 



fourth row of scales, in addition to the usual one on each side of the 



median line. In 447(> and '2()S'2 the superior is partially broken into 



spots. In No. UObl the bands are ob.solete, being represented by black- 



• Salradora bairdii Jan, Iconcgrafia degli Ofidi Tab. iii, p. M. Specinion.s in U. R. 

 Nat. .Mus. fr(uu Orizaba Vera Cruz, West Tehuantrpcc and Chihuahua: Sumirhra«t, 

 and Potts; and in Mus. Acad. Phila. from .Jalapa. Vera Cruz, Mr. Pea.se. 



t Sah-udora nuxicatin D. & H., Cojie. Hull. I'. S. Nat. Mus., ".12. p. 72, l-f7 ; /mtutu^ 

 mexiccnun 1). & 15., Erp. Ceu., vii, 1S')1, p. 6l».'» ; l.ylorliytichuti ui fxivanut Coye, Proc. 

 Amer. Philos. Soc, 1669, p. 2GG ; Coluber niexicanus Garman, Mem. Mus. Comp. ZoOl. 

 Cambr., VIII, 1&'8:{, 14^. The la^t maxillary tooth is separated a little from the others, 

 hence diacranterian. 



