Bauhaus-Universität Weimar

Titel:
The Cyclopaedia of Anatomy and Physiology, vol. 2: Dia-Ins
Person:
Todd, Robert Bentley
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit25760/870/
862 INSECTA. 
thorax, which anteriorly covers the base of the 
head. Some exceptions exist to these charac¬ 
ters in the Bostricidæ and their congeners, 
which ought perhaps to be removed to another 
tribe. In the Lampyridœ (glow-worms), (jigs. 
335 and 336), there is an example of a circum- 
Fig. 335. Fig. 336. 
Male. Female. 
Lampyris noctiluca, ( Glow-worm). 
stance not uncommon among insects, the pos¬ 
session of wings by the male sex and their 
entire absence in the female. The Ptinidœ or 
death-watches, and other Xylophagous insects 
of this tribe, although small, are exceedingly 
destructive to furniture and the wood of houses ; 
and the Bostricidæ and Sc.olytidœ to living trees. 
It is an insect of this family, Scolytus de¬ 
structor, that of late years has occasioned in¬ 
calculable mischief to the elms in St. James’s 
Park and Kensington Gardens, and in the 
park at Brussels. So lately as the summer of 
1836 nearly eighty fine elms were cut down at 
the latter place and its neighbourhood, in con¬ 
sequence of decay occasioned by this pest.* 
Another species S. pygviæus, which attacks 
the oak, has destroyed many thousands of 
young trees in the Bois de Vincennes.j Ano¬ 
ther genus, Tomicus typographus, was so de¬ 
structive in the Hartz Forest in Germany du¬ 
ring a series of years from the beginning of the 
last century to 1783, that the number of trees 
destroyed by it in that forest alone was calcu¬ 
lated at a million and a half.J 
In the third section* Pseudo-tetramera, 
Westw., the speeies have one false and four dis¬ 
tinct tarsal joints to their legs, with pulvilli or 
hairy cushion on their under surface, and the 
ante-penultimate joint is bilobed and broader 
than the others. The section is divided into two 
tribes. 
In the first tribe, Rhynchophora, (fig. 337), 
the head is elongated in the form of a snout or 
rostrum, at the extremity of which is the mouth, 
and at the sides are inserted the antennae which 
are usually geniculated and club-shaped. The 
larvæ of these insects are generally apodal, 
and many species are exceedingly injurious to 
the blossoms of the apple, pear, and other 
fruit-trees. Beth the larva and perfect indi¬ 
vidual of one minute species, well known, as 
the “ weevil,” Calandra granaria, closely al¬ 
lied to fig. 337, occasion immense losses in 
the storehouses of the factor by attacking and 
destroying his corn. The parent insect not 
* Trans. Ent. Society, vol. ii. p. xvi. 
t Annal. Soc. Ent. France. 1836, pp. xvi. and 
xxx. 1837, p. iv. 
j Latreille, Hist. Nat. tom. ii. Gmelin, Ab- 
hand. über die Wurmtroekniss. Leipz. 1787. West- 
wood, Introduction, &c. vol. i. p. 352. 
Fig. 337. 
Calandra longipes, male. 
only feeds upon the corn itself, but deposits a 
single egg in every grain, and the larva when 
hatched devours the whole excepting the husk. 
The second tribe, Longicomes, (fig. 338), 
Fig. 338. 
Cerambyx latipes. 
are known chiefly by the great length of the 
antennae, which usually exceeds that of the 
whole body. Their mandibles are strong and 
pointed ; the body elongated and depressed ; 
and the prothorax, which is often tuberculated 
or spined, is narrower than the abdomen. 
Their larvæ are short, thick, and apodal, and 
are furnished with strong mandibles, and live 
beneath the bark or in the wood of trees. 
The third tribe, Phytophaga, Kirby, is also 
composed of pseudo-tetramerous insects, with 
pulvilli on their tarsi, and is divided into two 
sub-tribes. In the first, Eupoda, the body is 
of an elongated oval form, the head is sunk 
deeply into a narrow prothorax, and the thighs 
of the posterior legs are greatly enlarged. In 
the second sub-tribe, Cyclica, the body is of a 
rounded or oblong oval (fig. 339), the base 
of the prothorax is narrower than that of the 
elytra, and the antennae, which are of moderate 
length, are inserted widely apart from each
        

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