CROCODIIJANS, LIZARDS, AND SNAKES. 1091 



GLYPHODONTA. 



This superfamily i)resents uo such diversity of character as to indi- 

 cate that it embraces more than one family, the Dipsadidix*. The sub- 

 families of the Dipsadidae correspond quite closely with those of the 

 Colubridae. They are defined as follows : 



I. Ilypapopliyses of vertebra} anterior only. 



Heruipeuis spinous. 



Calyciilate; sulcus nudivided Dipsadin^ 



Calyculate ; sulcus bifurcate Scytalixje 



Not calyculate; an apical disk Erythrolamprin^ 



II. Hypapopbyses extending tbrougbont column. 



Not calyculate; uo basal book nor apical disk HoMALOPSiNiE 



These subfamilies correspond with those of the Colubrid*, as follows : 



Cohibridse. DipsadidiP. 



Xenodoutinae. Erytbrolamprinje. 



Dromicin». Scytalinje. 



Colubriufe. Dipsadinaj. 



Lycodontinas. Homalopsinis. 



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 columns is nearly cosmopolitan. The fourth group of 

 each column is nearly 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. 



ERYXHROL^^lVIPRIlSr^^:. 



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

 genera. 



I. Heiuipenis generally spinous; disk at tbe extremity of tbe sulcus. 



Coronelliform ; scuta normal Erythrolamjirus Boie 



II. Hemipenis witb spines in two bands only : disk at one side of the sulcus. 

 Attenuate; scuta normal; disk papillose; spines joined by a longitudinal mem- 

 brane Lyi/ophis Tscbudi. 



Neither of the above genera occur in the Medicolumbiau region. 



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



No calyces ; rostral plate normal Jaltris Cope. 



Calyces at apex ; rostral plate produced Conojihis Peters. 



II. Calyculate and not capitate. (Calyculati.) 



a. Hemipenis divided. 



Rostral recurved lihinostoma Magler. 



Rostral normal ; pupil erect Oxyrhojius Wagler. 



Rostral normal ; pupil round Philodrijas Wagler. 



aa. Hemipenis undivided. 



Rostral normal Thamnodynasies Wagler. 



