184, homalockauhtm:. 227 



T-ery prominent. Rostral large, broader than deep, its upper 

 portion measuring about two thirds its distance from the frontal ; 

 internasals about half as long as the prsefrontals ; frontal hexagonal, 

 obtuse-angled in front, aoute-angled behind, a little longer than 

 broad, longer than its distance from the end of the snout, 

 shorter than the parietals ; nostril in a divided or semidivided 

 nasal, which is in contact with or narrowly separated from the 

 prseocular ; latter exceptionally divided ; one or two postoculars * ; 

 temporals 1 + 1; seven upper labials, third and fourth entering 

 the eye ; first lower labial in contact with or separated from its 

 feUow ; four lower labials in contact with the anterior chin-shields, 

 which are longer than the posterior. Scales in 15 rows. Ventrals 

 121-153; anal divided; subeaudals 42-58. Pale brown above, 

 head dark brown or black ; lower parts white. 



Total length 260 millim. ; tail 50. 



Lower California to Western Texas and JN'orth Mexico. 



tf-e,(Z. c?(V.127,126; 0.?, Duval Co., Texas. W.Taylor, Esq. [P.], 

 68), 2 (V. 163; 0. 45), & J' » "i L J 



yg. (V. 121 ; C. 67). 



22. Homalocranium calamarinum. 



Tantilla calamarina, Cope, Proc. Ac. PhUad. 1866, p. 320, andJourn. 



Ac. Philad. (2) viii. 1876, p. 143. 



bimaculata, Cope, Juurn. Ac. Philad. (2) viii. 1876, p. 143. 



Homalocranium bimacnlatum, Bocourt, Miss. Sc. Mex., Rept. p. 580, 



pi. xxxvi. flg. 6 (1883); Giinth. Biol. C.-Am., Sept. p. 154 



(1895). 



Eye not half as long as the snout, which is prominent. Eostral 

 broader than deep, well visible from above ; internasals about half 

 as long as the prsefrontals ; frontal hexagonal, slightly longer than 

 broad, longer than its distance from the end of the snout, shorter 

 than the parietals ; nostril between two nasals, the posterior in 

 contact with or narrowly separated from the prseocular ; one post- 

 ocular; temporals 1 + 1, the anterior sometimes separated from the 

 postocular by the contact of the parietal and fifth labial ; six upper 

 labials, third and fourth entering the eye ; first lower labial sepa- 

 rated from its fellow by the symphysial ; four lower labials in 

 contact with the anterior chin-shields, which are longer than the 

 posterior. Scales in 15 rows. Ventrals 119-132; anal divided; 

 subeaudals 27-35. Pale brown above, with three brown longi- 

 tudinal lines, the vertebral extending to the head, which is dark 

 brown, and dividing a yellowish occipital blotch ; end of snout 

 yellowish ; lower parts white. 



Total length 195 millim. ; tail 25. 



Mexico. 



* Two of the specimens in the Oolleelion have one postocular on each side ; 

 the third has one on the left side and two on the right ; whilst in the fourth 

 the postocular is fused with the supraocular. 



ft2 



