VOL. X 

 189 



j"'] PROCEEDINUS OF THH NATIONAL MUSEUM. 029 



j^iiislied at all ages by the JinaiipMiu'iit of tlie lateral stripes and llie 

 miiConii coloration of the head. The ydhnv strijie is, like that of the 

 Jj. Uitenile, on tlie thinl and fuiirlh rows only, Init the dark lian<l helow 

 it only occupies tlic adjacent parts of the second and third rows, in- 

 stead of extending to tlie gastrosteges. There is a yeUow l)an«l on tlie 

 adjacent parts of the lirst and second rows, whicii is absent in the li. 

 laterale, and there is a dark stripe on tlie adjacent parts of the first row 

 and the gastrosteges, where the inferior yellow stripe is present in the 

 /.'. scltottii. The bell^' is light, and not dark, as in the last mentioned 

 species. 



Southern CalilVnnia and Arizona. 



Bascauium laterale aurigulinu Copo. 



liasatn'nttn nurlijiilitin Cope, Cliock List Hatr. jiiid Kept. X. Aiiipr., IHTft, p. 10. Diiiinohiiiii 

 auriijiiliix C'opf, Pidc. Acad. I'bila., iHdl, j*. 'Ml. 



Lower California. 



Bascanium schottii }U\. aud Gird. 



Mastivophia schottiiBii. and Gird., Cat. Kept. N. Ainer., Pt. i, Serpents, 18r>:{, p. KJO ; 

 Baird, U. S. Mex. Boiuid. Siu-v., ii, Reptiles, 1859, p. 20, PI. xviii. 



Several specimens of this species confirm the constancy of its char- 

 acters. 



Kio Grande Valley. 



Bascanium oriiatum Bd. and Gird. 



Ma/iticophis ornatus Bil. and Gird., Cat. Serpt. N. Ainer., l'<t'^, pp. I(i2, ir)9. Jiagrnnium 

 ttrniatum (jiiKttum Bd. and Gird., Cope, Clieck List Batr. Kept. X. Ainer., l^T.'), p. 10. 



Western Texas. 



Although this species has the scale formula and some rescnblance in 

 coloration to the 7>. ta'nialnin, 1 can not now refer it to that species. The 

 head is elongate with narrow pr(»t alterant mn/-/,le, more likf the l!. Jhnirlli- 

 fiivme and />. laterale. The />'. ornatuDi displays the unusual peculiarity 

 of a striped species with a tendency to become annulate. 



Bascanium txniatuni H:illi>w. 



Cope, Check List X. .Vnnr. I'.atr., K'.-pt., 1''7."., p. In; l.rplophin InninUt Tlnlloweli, Proc. 



Acad. Phila.. vi. is.VJ, p. \-\. 

 .l/rts/iVKy/Ztiw /(/iii(j/«.s Bd. and (Jinl., Cat. Serpt. K. Ainer., l-.'>:'.. p. 10:t: .Ian. Icon. Gen. 



Opid., II, 2-2, V, Fi;,'. L 



Sonoran region to Salt Lake; i'acilu' region to northern California. 



A young si)ecimen (.Jl^-i) has the tendency to a yellow stripe on the 

 tiiird, fourth, and fifth rows of scales above referred to, well marked. 

 The head shields above have narrow pale margins. The frontal plate 

 is not so narrow posteriorly as in the a<lnlt from the same and other 

 localities. Still younger individuals (Nos. l!>si> ;ind UVi:\) have the 



