1885.] ^"5 [Cope. 



in another there is an azygos plate between the prefrontals. In ail of the 

 others azygos plates are wanting. The ocular plates are normally 3-3, 

 Lut the following variations occur. 2-3 — 2-3, one ; 2-3 — 3-3, one ; 

 2-2 — 3-3, one. The loreal is normally quite elongate ; in one specimen it 

 is shortened. The color varies from uniform brown above, to spotted in 

 two styles. In one of these there are seven rows of brown spots with 

 paler or rufous centres ; in the other the brown borders of the spots have 

 disappeared, and the rusty centres are represented by small rusty orange 

 spots. The under surfaces are yellow, the gastrosteges with dark shading 

 at the ends. In young specimens the head is more or less marked with 

 obscure blackish marks. This species is distinguished by its long com- 

 pressed muzzle. 



The teeth in this species are equal, so that the genus Atomarchus to 

 which I referred it stands related to Eutamia, as Regina does to Tropido- 

 notus. 



19. Eut^eniamegalops Kenn. Cope, Proceeds. Anier. Philosoph. Society, 

 1884, p. 173. 



Evidentlj 7 the most abundant snake of Chihuahua. The large number 

 of specimens sent display very little variation, and agree with one from 

 New Mexico, described by me as above. The lateral baud generally occu- 

 pies only the third row of scales, but sometimes borders the fourth. The 

 dorsal band very frequently occupies but one row of scales, but occasionally 

 covers the halves of the adjacent rows. Nos. 14226-27-58-59-00-67-77- 

 85-89-92. 



20; Eut^nia cyrtopsis Kennicott. Cope, 1. c, 1884, p. 174. 



Only one specimen ; No. 1425G. The number of urosteges is exactly 

 intermediate between the figures representing the supposed species cyrtop- 

 sis and collaris Jan. As there is no other difference it is probable that the 

 latter name must become a synonym of the former. 



21 Hypsiglena ochrorhynchus Cope. One specimen ; No. 14287. 

 22. Trimorphodon vilkinsonii, sp. nov. 



Scales in twenty-three rows. Superior labials nine, of which the fourth 

 and fifth enter the orbit, and of which all are higher than long excepting the 

 fifth and the eighth. Loreals two ; oculars 3-3 ; temporals 3-3-3. Ros- 

 tral not prominent, but the apex is recurved on the summit of the snout. 

 Frontal plate rectangular, the lateral and anterior sides equal. Parietals 

 narrowed posteriorly. Inferior labials eleven, the fifth in contact with 

 pregeneials, and none in contact with postgeneials. Postgeneials much 

 shorter than pregeneials. Gastrosteges 231 ; anal 1-1 ; urostoges 77. The 

 body is compressed, and the head is very distinct. Total length, M. 

 .272 ; of tail, .045 ; of head to rictus oris, .0092. 



General color gray ; the back is crossed by narrow black cross bands, at 

 rather remote intervals. These bands are pale bordered, and narrow to 

 an apex below, which is above the gastrosteges. They become narrower 



