374 MODERN CLASSIFICATION OF INSECTS. 






with the second joint long and slender, and the last distinct, and 
pointed at the tip (fig. 104. 4. head of Trochilium; 7. ditto of 
fEgeria ; 8. labial palpus of Aigeria denuded). The spiral tongue 
varies in length, being not longer than the palpi in Trochilium; the 
legs are long, the posterior with very long spurs. In Trochilium, the 
posterior tibize are very thickly pilose. The abdomen is elongated, 
and generally terminated by a brush, capable of opening and closing 
at will. The wings are furnished with but comparatively few nervures. 
The larve of these insects are fleshy grubs, of a cylindrical form, 
and with naked bodies destitute of a caudal horn. They have six 
pectoral, eight ventral, and two anal feet. They live in the interior 
of the branches or roots of trees, of the débris of which they con- 
struct a cocoon, or at least a partial one, in which they undergo their 
transformations to chrysalides, the abdominal segments of which are 
armed with transverse rows of recurved points, whereby the chrysalis 
is enabled to push itself through the cocoon, and half out of the hole 
in the stem, which the larva had previously made, having had the 
instinct to turn round in its burrow, so that the head of the pupa 
might be towards the orifice. Figure 104. 1. represents the larva, 
and 104. 2. the pupa of Trochil. bembeciforme (Crabroniformis 
Haworth), a species which lives upon the willow (Salix Caprea), 
the young wood of which it perforates occasionally to such an extent 
as to become a serious injury. (Bree, in Mag. Nat. Hist., n.s., vol. i. 
p- 19., and Loudon’s Arb. Brit. p. 1482.; Lewin, in Zrans. Linn. 
Soc. vol. iii. tab. i.; and Blomer, in Mag. Nat. Hist. No. 21.) 
The larva of a curious American species, remarkable for the diver- 
sity of the sexes (/ig. exitiosa Say), is very destructive to peach 
trees in the United States. (Worth, ut supra citat.) 
