734 REPORT OF NATIONAL MUSEUM, 1898. 



III. Capitate ^or pocketed) (Capitati). 

 q)q>. 1 1 emipenis undivided. 



Scale pits single; scales smooth Pliocercus Cope. 



No scale pits ; scales smooth Ehadinwa Cope. 



Scales keeled; prenasals in contact.. Treianorldnus Dumeril and Bibron. 

 g)cp. Hemipenis divided. 



Rostral normal ; isodont Ninia Baird and Girard. 



IV. Papillose at apex. (African) (Papillati). 



Hemipenis single Grayia Giinther. 



Hemipenis bifurcate Theleus Cope. 



V. Calyculate, with spinous bands to apex. (Calycispinosi.) 



Hemipenis bifurcate ; colubriform Twniophallus Cope. 



Subisodont ; attenuate Uromacer Dumeril and Bibron. 



W. Exclusively spinous to apex (diacranterian). (Spinosi.) 



Anterior teeth vs^anting Enulius Cope. 



Anterior teeth present; internasal plates fused; fusiform..^i/dj-oj;s Wagler. 

 Anterior teeth present ; anal divided; no scale pits; colubriform; not bifur- 

 cate Echinanthera Cope. 



Anterior teeth present; anal entire; one scale pit; colubriform; bifurcate. 



AcanihopJiallus Cope. 

 AA. Left lung with a proximal diverticulum extending to the throat. 

 VII. Calyculate and capitate. 



Rostral recurved; hemipenis divided; diacranterian .. .Heterodon Beauvois. 



Any 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 are placed close together, 

 as, for instance, Tretanorhinus and Eelicops and their associates. This 

 is, however, a necessity of an artificial key and is not new in zoology. 



The species of this subfamily are all American, and mostly neotrop- 

 ical. The following genera are found in the Medicolumbian fauna: 

 Garplwphiops, Ahastor, Farancia^ Biadophis, Bhadincea, Heterodon. Of 

 these, all are characteristically nearctic except Bhadincea, which is 

 neotropical. Of the remaining genera Hypsirhynchus and Neomacer 

 have been only found on the island of Santo Domingo, while Adromicus 

 and Halsophis are principally if not entirely West Indian. Amastridium, 

 Pliocercus, and Ninia are Central American and Columbian, while 

 Tretanorhinus is the only genus which belongs both to this region and 

 to the West Indian. Relicops is confined to the Brazilian district, 

 where it is represented by a number of species. 



The fusiform types are Pseudoeryx, Babidosoma, Carphophiops, Abas- 

 tor, and Farancia. The rest are more or less colubriform, except 

 Uromacer, which is very slender, including only tree snakes. 



CARPHOPHIOPS Gervais. 



Carphophiops GuKVAis, Diet. Hist. Nat. Univers., parD'Orbigny, III, 1843, p. 191.— 



Cope, Proc. Acad. Nat. Sci. Phila., 1860, p. 78. 

 Celuta Baird and Girard, Cat. N. Amer., Rept., Pt. 1, Serp,, 1853, p. 129. 

 Carphophis Dumeril, Prodrome Class, Rept. Ophid., 1853, pp. 43-46 ; Erp. G6n., 



VII, 1854,p. 131.— GuNTHER, Cat. Col. Snakes Brit. Mus., 1858, p. 17.— Bou- 



LEXGER, Cat. Snakes Brit. Mus., II, 1894, p. 324. 



Head depressed, continuous with the body. Cephalic plates normal, 



