86 BULLETIN OF THE 
the rostral at the lateral angles and on the top. Rostral very high, rather more 
than twice as high as broad, extending considerably above the general surface 
of the head, forming the anterior face of the bony protuberance. Crown cov- 
ered with keeled scales, of which there are eight series between the supracilia- 
ries, Supraciliaries large, elongate, entire. Anterior portion of nasal twice as 
large as posterior, upper angle acute. Pit surrounded by three scales, neither 
of which enters the orbit. Anteorbitals two, lower small, upper large and 
separated by two plates from those on the sides of the knob on the snout. 
Below the eye a large plate rests on the fourth labial; between this and the 
supraciliary there are five small orbitals, decreasing in size backward. Labials 
eight to nine, narrow, third and fourth largest, posterior four bounded above 
by as many large smooth scales, Infralabials twelve, anterior largest, in con- 
tact with its opposite behind the mental. A pair of short, broad submentals, 
followed by others more scale-like. Scales carinate, in 23 rows, vertebral nar- 
row, outer row broad, faintly keeled. Ventrals 151, broad. Subcaudals 38 
pairs. 
Yellowish brown, punctulate with brown ; yellowish below. Back with a 
series of subquadrate light-edged spots of brown (37), more or less often 
divided on the vertebral row into two series, which alternate posteriorly. 
Flank with two alternating series of smaller, less distinct blotches. Lower 
flank and abdomen with flecks and punctulations of brown. Seven spots on 
the tail. A band from the nostril, through the eye, to the angle of the mouth. 
A blotch on the prefrontal region, A pair of spots on the parietal region. 
diverge posteriorly, then approach again on the nape. Posterior labials with 
brown margins, Chin clouded with brown, Coloration closely resembling that 
of light-colored specimens of Heterodon platyrhinus, 
Ehinocerophis agrees in pit, fangs, squamation, bifid subeaudals, and mi- 
nor characters, with Coplas Merr. (Bothrops Wagler), in which it might be 
placed as a subgenus. It differs in the rostral protuberance, the consequent 
upward extension of the rostral shield, and great development of the caudal 
spine. 
The specimen described was secured by the “ Hassler” Expedition at Puerto 
San Antonio, Eastern Patagonia. The jar in which it is kept bore the name 
Bothrops nasus, foy which T am unable to find authority or description. 
Rhinichthys meleagris Acassiz, 1854, Am. Jour. Sei. 857. 
D.24-8;4.24-7;V.8; P.14; L.lon. 71 (70-76) ; L. trans. 114-1410, 
Teeth 4.2 — 2.4, compressed, uncinate, 
Body moderately stout. Head broad behind, narrowing rapidly in front. 
Snout blunt, Length of head more than four times, and depth of body five to 
five and one half times in the total length, without eaudal. Eye small, diam- 
eter of orbit less than twice in length of snout or width of interorbital space. 
Mouth somewhat oblique, close to the end of the snout. Jaws nearly equal. 
