1893.] Zoology. 481 
Fusiform. Chilomeniscus; Fici imia; Geagras; Cemophora; Rhinochilus; Con- 
opsis (has papillæ at the apex in addition to a few cups). ; Stylosoma (spinous 
nearly to apex.) 
Colubriform. Contia; Hypsiglena (pocketed below apex) ; Proterodon; Dianodon ; 
Coronella; Ophibolus; Rhinechis ; ie awa (four rows of spines dividing 
calyculate apex); Salvadora ; T e ; Epiglot aed pansies Spilotes ; 
Coluber; Bascanium; Drymobius ; Zam seals Ptyas ; Herpetodryas ; itn wet 
Liopeltis; Cynophis (has a ki papilla which is pro! pan ed into an awn 
Crossanthera, (g. n.) established for Deudrophidium melanotropis Cope, on 
account of the total division of the walls of the small cups into papillæ 
Attenuate, Dendrophis; Leptophis; Bucephalus; Dasypeltis (papillæ spinous to 
apex.) 
In the DrrsaprxÆæ the same gradation appears. 
Fusiform. Tantilla; Scolecophis; Ogmius (spines to apex). 
Dipsadiform; (generally pocketed below apex). Sibon ; Trimorphodon ; Crotapho- 
peltis; Himantodes; Rhinobothryum; Dipsas. 
Attenuate. Cladophis; Oxybelis; Dryophis (has a diverticulum simulating a bifur- 
cation of the hemipenis) ; Tragops ; Passerita. 
The CHRYSOPELEIN® includes only the genus Chrysopelea, so far as 
I have examined. 
Genera of Colubride in which the calyces are not papillose, are 
Phyllorhynchus, Hypsiglena, Dianodon, Proterodon, Coronella, Sym- 
phimus, Dendrophis, Crotaphopeltis and Dipsas. 
XENODONTID£. 
The arrangement of the genera of this family is difficult, and what is 
presented here is only tentative. It seems probable that some genera 
with a grooved posterior tooth are more nearly allied to others with a 
smooth tooth than to each other; but on the other hand the external 
form of the animal is a poor guide, as all forms pass into each other. So 
also the reticulate or plicate character of the integument of the hemi- 
penis. Many of the genera may be distinguished by details of structure. 
As before, I designate the general forms as fusiform, colubriform, 
attenuate, ‘and dipsadiform ; and for the present I adopt two sub- 
families. a 
Aglyphodont; ; Xenodontine. 
Glyphodont ; i Scytaline. 
XENODONTIN &. 
Fusiform. Catostoma; Carphophiops; Farancia* ¢; Pseudoeryx; Ninia. 
Colubriform. Homalosomat; Grayia; Theleus g. n.; Diadophis; Rhadinæa* 
Pliocercus ; Srema Liophis*; Dromicus; Alsophis; Lianthera g. n. ; 
Hypsirhynchus*; Amastridium ; a Xenodon* ; Acantebpiadat s 
Lystrophis* ; Heterodon. 
