1894.] Zoology. 613 
the typical species H. cenchoa L., does not occur in Central America and 
Mexico, the individuals which have been hitherto referred to it, re- 
presenting another species, which I call H. semifusciatus. Of the seven 
species, five belong to this region, and two to continental Soutb Amer- 
ica. 
I. A small additional superior preocular plate. 
Scales in 17 rows; superior labials 4 and 5 in orbit; one scale in 
first temporal row ; vertebral row enlarged; dorsal spots ontending to 
gastrosteges throughout ; H. cenchod L. 
II. One large preocular plate only. 
8. Scales in 15 rows. 
One scale in first temporal row ; superior labials 4, 5, and 6 bound- 
ing orbit; vertebral row enlarged ; dorsal spots terminating in an angle 
near gastrosteges; no lateral spots ; H. lentiferus Cope. 
s5. Scales in 17 rows. 
&. One scale in first temporal row. 
[Two labials in orbit; vertebral seales enlarged ; on posterior two- 
thirds the length the dorsal spots are small and lateral spots are present ; 
exceptionally, H. semifasciatus Cope.] 
Two labials in orbit; vertebral scales similar to the others, spots as 
in H. semifasciatus ; H. gemmistratus Cope. 
Bf. Two scales in first temporal row. 
v. Dorsal spots continued to gastrosteges throughout. 
Vertebral row enlarged ; superior labials 4 and 5 in orbit; 
H. leucomelas Cope. 
Vertebral row like other scales; superior labials 4, 5, and 6 in orbit ; 
H. tenuissimus Cope. 
vv. Dorsal spots reduced posteriorly ; lateral spots. 
Vertebral row enlarged ; H. semifasciatus Cope. 
[Vertebral row like others; exceptionally, „H. gemmistratvs Cope.] 
III. A small inferior preocular plate. e 
8. Two scales in first temporal row. 
Scales in 17 rows ; vertebrals large, wider than long ; labials 4 and 
5 in orbit; dorsal spots continued to gastrosteges throughout ; 
H. anisolepis Cope. 
Himantodes lentiferus sp. nov. Besides the characters already men- 
tioned, this species exhibits the following:  Labials eight above, ten 
below. Seventh superior labial as high as long; temporals 1-2-3. 
Postgenials in contact anteriorly, separated by two scales posteriorly. 
3 Specimens from Brazil and E. Ecuador from Prof. Orton. 
