138 
01 ^ THE PHYSIOaiSrOMY OF SEEPEKTS. 
to 180 -{- 60. B. S. 19. The lung extends behind the 
heart into the abdominal cavity. The colours of this 
Xenodon are very subject to variation : they are found 
brown, red, and sometimes of a very uniform olive-grey. 
3. Xenodon inornatus inhabits Java, where it is very 
rare. It is of an uniform olive-brown, and has very nearly 
the form of the Xenodon Severus, although it is very in- 
ferior in size ; S. 120 -f- 38. B. S. 19. The young have 
the upper parts relieved by very indistinct transverse bands, 
and there are several bands on the occiput, which unite 
into an angle. 
4. Xenodon purpurascens, an inhabitant of Java, as 
rare as the preceding, is distinguished from all the rest 
by a system of colouring extremely beautiful. The form 
recalls that of Coronella laBvis ; but our Xenodon is more 
robust, and of a habit more vigorous. It has the rostral 
plate very large, vaulted, and salient ; the muzzle is a 
little truncated at the extremity, and the abdomen is 
slightly angular. The general colour is a brick-red, 
covered with dark marblings ; above it has eighteen broad 
bands or spots of a reddish ‘White, punctured with black ; 
S. 175 + 45. B. S. 19. 
There exists in Brazil a third species, the 
5. Xenodon Schottis, which presents a more attenu- 
ated form than the preceding, and its narrow head is ter- 
minated by a rostral plate, slightly salient. Above olive- 
brown ; below yellowish. S. 178 + 46. B. S. 19. 
6. Xenodon Michahellis is the only species of Xeno- 
don known in Europe ; it inhabits Spain and the south 
of France. It is distinguished by its short and conical 
head, terminated by a prominent rostral plate ; by scales 
disposed in twenty-seven rows, and by the large number 
of its scuta (216 + 60), by its short and conical tail, and 
by its olive-brown colour, relieved by two dorsal rays of 
a dark hue ; several other rays descending on the sides of 
the head. The system of colouring in the young differs 
entirely from that of the adults, inasmuch as the tints are 
very clear, and relieved by large spots. 
7 . Xenodon Typhlos of Guyana unites to the habit of 
a Coronella the form of the Xen. Severus in every thing, 
