POGONASPIS.—CERCOCALAMUS, 157 
1. Pogonaspis ruficeps. 
Pogonaspis ruficeps, Cope, Proc. Ac. N. Sc. Phil. 1894, p. 204. 
Hab. Costa Rica, Jimenez (Alfaro). 
Posterior frontals in contact with the second labial. Vertical and occipitals elongate, 
the former angulate in front and pointed behind. One ante-, two postoculars. Upper 
labials seven, the third and fourth entering the orbit, the fifth and sixth lower than the 
large seventh. Temporals 1+1. The lower labials of the first pair in contact with 
each other. Scalessmooth*. Ventrals 146; anal divided. Light brown above, yellow 
below. Median dorsal row of scales deep brown; a narrow yellow line on the adjacent 
borders of the third and fourth rows of scales, which is bounded above by a single dark 
brown row, and below by several rows with dark brown centres. All the colours less 
conspicuous posteriorly. Upper surface of the head light reddish-brown, with a pale 
spot at the extremity of each occipital. A black spot below the eye. ( Cope.) 
Nots.—Another Central-American Snake described by Mr. Cope is Enulius murinus, 
Proc. Am. Phil. Soc. xi. p. 558 (1871), from Nicaragua. As originally described, this 
genus would seem to be well characterized and easily recognizable. But although 
Mr. Cope has referred to this genus on several subsequent occasions, his most recent 
observation (Proc. Ac. N. Sc. Phil. 1894, p. 205) is calculated to excite some doubt as 
to the accuracy of the original description. He had described it as having a long, 
strong, grooved tooth, whilst recently he associates with it Leptocalamus torquatus 
(Giinth.), an aglyphous snake, of which I have now examined three specimens, one from 
Nicaragua. Under these circumstances, and until by a renewed examination of the 
type the glyphodont dentition of Znulius is clearly established, one cannot help 
thinking that Bocourt was right after all in recognizing Cope’s Enulius murinus 
in the aglyphous snake described and figured by him. 
CERCOCALAMUS. 
Cercocalamus, Giinth. Ann. & Mag. Nat. Hist. 1863, xi. p. 21. 
Differs from Homalocranium by having undivided subcaudal scutes. 
1. Cercocalamus collaris. 
Cercocalamus collaris, Giinth. Ann. & Mag. Nat. Hist. 1863, xi. p. 21, t. 3. fig. A. 
Hab. CentRaAL AMERICA. 
Rostral shield much broader than high, not recurved backwards ; anterior frontals half 
as large as the posterior, which are bent downwards on the side; vertical not quite 
* The author has omitted to state the number of rows. 
