OPHIDIA— COLUBEIDAE— CONTIA ISOZONA. 625 



b. ANNULATUS. 



Lamprosoma annulatum, Kenn. apud Bd., U. S. & Mex. Bouud. Surv., ii, 1S5D, 22, 

 (iu text: Colorado Desert, Ariz.; uauie proposed if distinct from true occvp- 

 itale, Hallow.). 



Chionactis occipitalis subsp. annulata, Cope, Check-List, 1S75, 3G 



Southern and Southwestern Arizona. Not seen by me. 



70. Contia isozona, Cope. 



Plate XVIII, Pigs. 1, la, 

 Contia isozona, Cope, Proc. Acad. Nat. Sei. Pliila., 1866,-301. — Id., Check-List, 1S75, 36. 



Two postoculars ; six rows of gular scales. Rostral rounded, slightly 

 produced backward. Scuta 158,^, 52. Twenty black half rings, separated 

 by equal spaces of pinkish ground color. Eye small ; its diameter con- 

 tained twice in length of muzzle. 



Preorbital narrower above, not extending above lower margin of super- 

 ciliary ; loreal twice as long as high. Prefrontals and internasals much 

 broader than long ; frontal slightly angulate in front, longer than broad ; 

 parietals rather elongate, subtruncate behind. Postorbitals subquadrate ; 

 temporals 1-2. Postgeneials minute. Superior labials seven, all higher 

 than long; eye over third and fourth. Scales in fifteen rows, all broader 

 than long. Tail four and two-fifths times in total length, which is 10.25 

 inches. Below immaculate. Tail completely six-annulate. 



Resembles the Sonora semiannulata, B. & G., but that species has two 

 nasals, three postoculars, the superior reaching the frontal ; frontal wider 

 behind than before, and only 149 gastroteges. — Cope. 



Described from specimens in my collection. The same author indi- 

 cates a variety of the species from Utah, with longer body, twenty-five 

 black bars ; body color vermilion above and yellow below ; scuta 167,^, 52. 



71. Chilomeniscus ephippicus, Cope. 



Plate XVI I r, Pigs. 3, 3a. 



Chilomeniscus ephippicus, Cope, Proc. Acad. Nat, Sci. Pliila., 1SG7, S5.— /</., Check-List, 

 1875, 35. 



Scales broad, in 13 rows. Tail about one-seventh total length. Rostral 

 plate large, entirely separating internasals, not encroaching on prefrontals ; 

 40 z 



