1894.] The Classification of Snakes. 841 
Colubriform ; diacranterian ; two nasals; Hypsirhynchus Gthr. 
esc. Hemipenis double. 
Fusiform ; isodont; Farancia Gray. 
Colubriform ; diacranterian; no scale pits; ^ Dromicus Bibr. 
Colubriform ; diacranterian ; one scale pit; JMonobothris Cope. 
Colubriform ; diacranterian ; two scale pits; ^ Halsophis Cope. 
. IV. Capitate (or pocketed) (Capitati). 
gy. Hemipenis undivided. 
Scale pits single; scales smooth ; Pliocercus Cope. 
No scale pits; scales smooth ; Rhadinza Cope. 
Scales keeled; prenasals in contact; Tretanorhinus D. & B. 
ev. Hemipenis divided. 
Rostral normal; isodont ; Ninia B. & G. 
V. Pappillose at apex. (African) (Papillati). 
Hemipenis single; ayia Gthr. 
Hemipenis bifurcate ; Theleus" Cope. 
. VI. Calyculate with spinous bands to apex. adr ttt 
Subisodont ; attenuate ; omacer D 
VII. Exclusively spinous to apex ; (diacranterian). cedes 
Anterior teeth wanting; — Cope. 
Anterior teeth present; anal divided; no scale pits 
Echinanthera Cope. 
Anterior teeth present; anal entire; one seen pit ; 
Acanthophallus Cope. 
À A Left lung with a proximal diverticulum, extending to 
the throat. 
. VIII. Calyculate and capitate. 
Rostral recurved ; hemipenis divided ; ——ÀÀ 
terodon Beauv. 
CARY one familiar with these genera will perceive that they 
are not represented in a linear series in the table. He will 
also observe that genera of probably not very close affinities 
? Gen. nov. Type, Dromicus chamissonis Auct. 
19 Amer, Naturalist, 1893, p. 482. 
1 Gen. nov.; type- Aporophis eyanopleurus Cope. This species is thought by 
Boulenger to d Natrix melanostigma Weg; bat that pecie is represented 
as unicolor above. T} t l bands, one median 
Lu E 
and one on each side. 
