IN^JSrOCUOUS SERPENTS. 
133 
compressed and surrounded with 19 rows of scales : this 
species is distinguished by four transverse black bands 
which adorn the head. This species is, above, brown ; 
below of a yellowish-grey. S. 185 + 70. 
17. Calamaria atrocincta. I have arranged in this 
genus the present anomalous species, a native of Chile, 
which approaches in form to certain Lycodons, but by the 
distribution of its colours it recalls the Coronella venus- 
tissima and the Elaps corallina. It has an angular abdo- 
men, a body banded with red and black. Rows of scales, 
15. S. 196 + 57. 
18. Calamaria Coronella. We come at last to this 
species, which might at first be mistaken for a small, smooth 
Coronella ; but its head is very thick, the frenal plates are 
wanting, the occipitals are broad, its form is very massive ; 
it has but 15 rows of scales. The general colour is a yel- 
lowish-grey, passing to brown, and the upper parts are 
marked by numerous dark transverse bands, but not very 
distinct. 
In the Third Family of Innocuous Ophidians we have united 
all the Terrestrial Serpents which have not been included 
in the two preceding families. With the exception of the 
Heterodons, they present but few anomalies in their orga- 
nization, and are modelled, so to speak, on the type of the 
genus Coluber. The most of them have the head covered 
by 9 plates, and the scales of middle size and smooth. 
The first genus is 
CORONELLA. 
It comprehends species which in their organization re- 
semble the true Colubers ; but they have a less size, a 
more compressed trunk, generally pentagonal, and covered 
with scales, for the most part smooth, and distributed in 
seventeen to nineteen ranges ; a tail conical and rather 
long. The genus Coronella inhabits the warm and tem- 
perate climates of both worlds ; they have not hitherto been 
observed in New Holland. They inhabit plains, and prefer 
humid places. 
