22 UNITED STATES AND MEXICAN BOUNDARY. 



yellow, tinged with dull pinkish along the vertical region; below whitish yellow, with narrow Mack rings 

 entirely around the body. In life, the whole ground color above may have been pinkish. 



The black ring 



<r reran 



out. 



to 



pass completely around the body. They are narrowest on the first lateral rows of scales and widest on 

 the middle of the abdomen and vertebral region. On the head is an occipital crescentic blotch, passing 

 from one eye to the other back through the middle of the occipitals. — (Kennicott.) 



The specimens described are with some hesitation referred to Lamprosoma occipitale. Dr. 

 Hallowell's type of this species differs in having only transverse dorsal bands, which do not 

 reach the abdomen, except on the tail, in place of the perfect annulations; and these bands 

 are only one and one-half scales wide and separated by three and a half or four scales of the 

 ground color; the occipital crescentic blotch is broader, but does not extend to the eyes. 

 Should these characters be permanent, the specimens described above must be referred to 

 another species, which might with propriety be called Lamprosoma annulatum. 



No. 2105-6. Colorado desert. A. Schott. 



99. LAMPROSOMA EPISCOPUM, Kennicott. 



Plate VIII, Fig. 2. 



Sp. Ch. — Form tapering very little toward the neck — which is not much narrower than the head — and 

 moderately tapering toward the tail. The tail forms about one-fifth of the total length. Head rather 

 depressed; crown flattened posteriorly. Snout broad, rounded, and depressed. Vertical a third longer 

 than wide; scarcely tapering behind; acute posteriorly, and usually slightly concave on the sides. 

 Superciliaries and occipitals short and narrow. Nasal elongated; nostril very small in the centre of the 

 plate. Loral elongated; not half as large as the ante-orbital, which is itself small and vertically 

 elongated. Post-orbitals of nearly equal size. Rostral subpentagonal; the apex acute and turned back 

 upon the crown, entering slightly between the pre-frontals. Seven upper labials; fourth, fifth, and sixth 

 largest and nearly equal in size, seventh very small. Lower labials seven; the fourth very much the 

 largest. The dorsal scales in fifteen rows; they increase regularly in size from the central rows, which 

 are much the smallest, to the first lateral row, which is higher than long. The color of the entire upper 

 parts of head and body is uniform light olive brown, tinged with green; but on close inspection each 

 scale is seen to be very minutely mottled with black toward the centre, and upon stretching the skin 

 the base of each scale is black. The abdomen is uniform whitish green. In a specimen from Rio Seco 

 the exposed base of each scale is black, giving the body somewhat of an indistinctly mottled appearance 

 even when the skin is not stretched. The colors become lighter after soaking long in alcohol, and the 

 black at the bases of the scales becomes more or less effaced. — (Kennicott.) 



2042. Eagle Pass. A. Schott.— 2045. San An 



Ke 



100. DIADOPHIS REGALIS, B. & G. 



Diadophis regalis, B. & G. Catal. N. Am. Serp. Jan. 1853, 115. 



Sp. Ch. — Form stout. Head very short, broad behind. Eye very small. Vertical plate broad, tapering 

 posteriorly. Dorsal scales in IT rows. Body above uniform greenish ash; beneath light yellow, with 

 scattered black spots. No occipital ring. — (Kennicott.) 



2062. Sonora. J. H. Clark.— 2064. Eagle Springs, Texas. J. H. Clark. 



101. DIADOPHIS DOCILIS, B. & G. 



Plate XXI, Fig. 3. 



Diadophis docilis, B. & G. Catal. N. Am. Serp. Jan. 1853, 114. 



Sp. Ch. — In form, the most slender of the genus. Head rather broad behind; snout narrow; crown 

 arched posteriorly. Eyes small. Vertical plate pentagonal, elongated, tapering but little posteriorly. 





