626 ZOOLOGY REPTILES AND BATRACIIIANS OF ARIZONA. 



nasal plate separating prefrontals and labials, in contact with preocular. 

 Postoculars 2, upper only in contact with occipital. Superciliaries very nar- 

 row ; occipitals as broad as long. Temporals -J, large ; labials above 7, third 

 and fourth in orbit ; these, with second, narrow, erect ; first longitudinal. 

 Inferior labials 8 ; first pair in contact before pregeneials ; postgeneials 

 very small. Total length, 5i inches. Gastrosteges, 113; separated from 

 geneials by 4 rows of gulars; anal, 1-1; urosteges, 28-28. Above reddish 

 or yellowish, with 21 black cross-bars to vent, which are broader than the 

 interspaces, and do not quite reach gastrosteges. Five nearly complete 

 rings on tail. Belly white. From occipitals to anterior part of frontal, with 

 the labials opposite this part (except their lower edges), black. Cope. 



Originally described from Owen's Valley, California (Dr. Horn?), and 

 subsequently indicated as occurring in the Sonoran Region. 



In the plate, Fig. 3 represents the position of the head shields as seen 

 from above. 



72. Tantilla nigriceps, /mm. 



Tantilla niyriceps, KENN., Proc. Actid. Nat. Sci. Phila., 18CO, 328. COPE, Check-List, 

 1875, 35. 



Form more slender and head narrow than in T. gracilis. Vertical plate 

 more elongate posteriorly; occipitals narrower. One anteorbital; two post- 

 orbitals. Seven upper labials. Color (in alcohol) uniform brownish-white 

 above, lighter beneath. Crown as far back as the occipitals deep black. 

 No indication of a postoccipital black ring, as in T. coronata. 



Originally described from Texas and New Mexico, and since ascer- 

 tained to inhabit Arizona. 



SCOLECOPHIDIA. 



STENOSTOMATIDAE. 



73. Stenostoma dulce, (Btl. it Gir.). 



Rena dulcis, BD. & GIR., Cat. N. A. Kept., 1853, 142. 

 Stenostoma dnlce, COPE, Check-List, 1875, 44. 



Indicated by Professor Cope from the Sonoran Region and Texas. 



