Venoms: Venomous Animals and Antivenomous Serum-therapeutics — John Shaqi
Venoms: Venomous Animals and Antivenomous Serum-therapeuticsCalmette, A. (Albert)
Science
Venoms: Venomous Animals and Antivenomous Serum-therapeutics
Calmette, A. (Albert)
Antitoxins; Poisonous snakes; Toxins; Venom
Blackish-brown or bluish, with narrow transverse white streaks, or
small white spots, or alternate rings of yellow and dark brown; belly
white. Smaller than the foregoing, scarcely exceeding 1,000 millimetres
in length. It is known as the “Krait” in India, where, after the
Cobra, the variety _cæruleus_ causes most deaths among human beings.
It is found in jungles and rice-fields, and commonly secretes itself
in old trees and old walls. It frequently penetrates into houses,
verandahs, bathrooms, and even beds. Sir Joseph Fayrer relates the
story of a lady, who, when travelling in a palanquin, found on arriving
at her destination a “Krait” coiled up in her luggage, the snake having
thus made the journey with her throughout a whole night.
The Krait may easily be confused with _Lycodon aulicus_, a harmless
snake which closely resembles it, though it can at once be
distinguished by examining its mouth.
(b) Naja.
(Fig. 25.)
Head scarcely distinct from the neck; eyes with round pupils; nostril
between two nasal shields and an internasal. A pair of solid grooved
poison-fangs. Body elongate, cylindrical, terminated by a conical and
pointed tail. Scales smooth, disposed obliquely, in 15-25 rows. Ventral
scales round.
_N. tripudians_ (_Cobra-di-Capello_). (Fig. 26.)
Head small, covered with large shields, a frontal as long as broad, a
supraocular, a præocular, 3 postoculars, 2 + 3 or 3 + 3 temporals, 7
upper labials, 4 lower labials. Neck dilatable by the separation of
the first cervical ribs; 21-35 scales round the neck, 17-25 round the
middle of the body; 163-205 ventrals; 42-75 subcaudals.
Total length, 1,500-1,900 millimetres; tail 230.
Coloration very variable, usually cinereous grey or almost black
with a bluish sheen; belly lighter, sometimes tinted with red. The
head is frequently tinged with golden-yellow; it is spotted with
yellowish-white above, and is pure white underneath.
This species is distributed throughout the whole of Southern Asia, from
the south of the Caspian Sea to South China and the Malay Archipelago.
[Illustration: FIG. 25.--Skull of _Naja tripudians_. (After G.
A. Boulenger, _op. cit._)]
Several varieties occur, and of these the principal are:--
(1) Var. _Typica_ (fig. 27), with a black-and-white spectacle-shaped
mark on the middle of the dorsal surface of the most dilatable portion
of the neck, and one or more dark transverse bands on the ventral
surface, behind the head.
_Habitat_: India, Ceylon.
(2) Var. _Cæca_.--Colour, pale brown or uniform dark grey, without mark
on the neck, and with one or more dark transverse bands on the anterior
part of the belly.
_Habitat_: Transcaspian region, India, Java.
[Illustration: FIG. 26.--_Naja tripudians_
(_Cobra-di-Capello_) ON THE DEFENSIVE, PREPARING TO STRIKE.]
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