THE CLASSIFICATION OF THE OPHIDIA. 207 



A loreal ; anal entire ; two internasals Eutmnia B. & G. 



A loreal ; anal divided ; one internasal Liodytes Cope. 



A loreal ; anal divided ; two internasals * Natrix Laur. 



AA. Sulcus bifurcate. (Hemipenis furcate.) 



Two apical papillae ; plates as Natrix Ceratophallus Cope. 



No papillae ; plates as Natrix \Bothrodytes Cope. 



No papillae ; one prefrontal plate % Trimerodyles Cope. 



GLYPHODONTA. 



This superfamily presents no such diversity of character as to indicate that it 

 embraces more than one family, the Dipsadidae. The subfamilies of the Dipsadidae 

 correspond quite closely with those of the Colubridse. They are denned as follows : 



I. Hypapopliyses of vertebrae anterior only; hemipenis spinous. 



Calyculate ; sulcus undivided Dipsadina. 



Calyculate ; sulcus bifurcate , Scytalince. 



Not calyculate ; an apical disc Erythrolamprince. 



II. Hypapopliyses extending throughout column. 



Not calyculate ; no basal hook nor apical disc Homalopsina. 



These subfamilies correspond with those of the Colubridse as follows: 



COLTJBRID^l. DIPSADID/B. 



Xenodontinse, Erythrolamprinee, 



Dromicinae, Scytalinse, 



Colubrinae, Dipsadinae. 



Jjycodontinae. Homalopsinae. 



The distribution of the subfamilies of corresponding pairs is nearly identical. 

 Thus the first two of both columns are South American, and the third of both col- 

 umns is nearly cosmopolitan. The fourth group of each column is restricted to the 

 African and Oriental regions. Still closer correspondences will be pointed out in 

 the characters of some of the genera of corresponding subfamilies. 



E RYTHKOL AMPKIN^. 



In this subfamily the sulcus and hemipenis are bifurcate in the known genera. 



I. Hemipenis generally spinous ; disc at the extremity of the sulcus. 



Coronelliform ; scuta normal ; disc smooth Erythrolamprus Boie. 



II. Hemipenis with spines in two bands only ; disc at one side of the sulcus. 

 Attenuate ; scuta normal ; disc papillose ; spines joined by a longitudinal membrane. . .%LygopMs Tsch. 



SCYTALE5L/E. 



I. Hemipenis transversely or obliquely plicate (divided). (Flabellati.) 



No calyces ; rostral plate normal Jaltris Cope. 



i at apex ; rostral plate produced Conophis Peters. 



■Including Amphiesma D. & B. f Including Diplophallus Cope. % Proceeds. Acad. Phila., 1894, p. 426. 

 \ Cope, definition, Amer. Naturalist, 1894, p. 84. 



A. P. S. — VOL. XVIII. 2 A. 



