1893.) Zoology. 483 
Of the HoMALoprsin& only the genera Homalopsis, Herpeton, and 
Cerberus have come under my observation ; but I suppose that Hypsir- 
hina and other allied Asiatic genera will be found to present the same 
characters. In both genera the sulcus is bifurcate, and the hemipenis 
divided. 
I have been able to examine but one genus of the PsEUDASPIDIN», 
viz., Pseudaspis Cope (type Coronella cana L.), but I suspect that 
Ablabes (A. rufulus) which is African, belongs here. In Pseudaspis 
the sulcus is bifurcate, and the hemipenis is divided almost to the base, 
quite as in the most specialized Solenogly pha. 
NATRICINE. 
This natural group includes fusiform and colubriform genera, and 
presents great variations in the form of the hemipenis. The Asiatic 
species have that organ Maa itt while in the European and American 
water snakes it is simple. 
Fusiform. (Hemipenis simple). Haldea; ia ss (the apex with a pair 
of robust age as in Oligodon;) Virginia 
Colubriform . Sulcus and hemipenis undivided. Sto ; Eutenia; Natrix; 
Clonephies sie II. Sulcus and api divided. ’ Dipl ophallus, g. n. 
(type. Zropidonatus piscator Schneid. ; syncranterian dentition, and no 
apical papilla); Amphiesma; camel “(established on Tropidonotus vittatus 
on account of the presence of a rigid papilla on the apex of each branch of the 
hemipenis.) 
SA Cs PRE I EEDE R A 
Similar gradations in the characters of the hemipenis are to be seen 
in the types of venomous snakes. Thus in the Proteroglypha this organ 
is spinous to the tip, on a calyculate basis, in Hydrophis, Elaps, (surina- 
mensis); Dendraspis. It is reticulate at the extremities and spinous 
below, in Callophis (bivirgatus) ; ; Naja; Acanthophis; Bungarus and 
Sepedon ; the apex smooth in the two genera last named. In Elaps 
nigrocinctus the organ is usually smooth, with a few spines at the apex. 
In Solenoglypha the genus Atractaspis is spinous to the apex, appar- 
ently on alongitudinally laminate basis. In the Viperide and Crota- 
lidæ the spines are on a flounced basis. The apices are calyculate in 
Bitis, Clotho, and Vipera, and spinous in Cerastes. They are calycu- 
late in Crotalide in Bothrops, Ancistrodon, Crotalophorus, Crotalus 
and Uropsophus. In Crotalus (durissus of the Neotropical fauna), 
the median spines are replaced by papillæ, in all the other genera they 
are spinous.—E. D. Corr. 
