INSECTA. 413 
Case-nymphs (Phryganee) there are, as in caterpillars, two long 
vessels, which secrete the silken material. In their straight intesti- 
nal canal, also, and in the small number of their vasa wrinaria, 
these larvee resemble caterpillars’; and on the whole the genus 
Phryganea, although still really belonging to this order, forms a 
very natural transition to the Lepidoptera, which does not rest 
merely on general external resemblance or analogy. 
In this order many species are met with in which the instinct 
is surprising, and their economy extremely interesting; we name 
. merely the lion-ant with its crafty device to overpower its prey, 
and the celebrated mines and buildings of the white ants, or ter- 
mites, &e. 
A. Neuwroptera with metamorphosis convplete. 
Tarsi in all quinquearticulate. é 
Family XXVIII. Phryganide (Trichoptera Kirpy). Wings 
deflected, posterior often broader than anterior, folded longitudi- 
nally, the anterior with numerous branched nervures, covered with 
hairs, coloured. Mandibles obsolete or very small, remote, not 
convergent. _ Maxillary palps long, with three to five joints, 
labial palps short, three-jomted. Prothorax short. (Antenne with 
numerous joints, long, mostly setaceous. Ocelli three.) 
Comp. C. F. Picrer, Recherches pour servir & 0 Hist. et & V Anatomie des 
¥ Phryganides. Avec pl. color. 1 vol. 4to, Genéve, 1834. 
Case-nymphs, Caddisflies. The upper jaws are here very small 
and little developed, as in the last order (Savieny, J/ém. s. 1. ani. s. 
vert. 1. p. 29, Pl. 1. fig. 1). The larve live in water, in cases open 
at both ends, composed of small pieces of wood, of small fresh-water 
shells (in which frequently the inhabitants are still resident), of 
sand, of duck-weed, of fragments of leaves that have fallen into the 
water, &c. They fasten these substances together by means of their 
web ; the inner surface of the case, which is very smooth, is also 
1 RampouwrR found only four, which agrees with the number in caterpillars, but 
this requires to be confirmed by further investigation, since Léon Durour, in the 
species examined by him, always met with six. However, the Ephemerine and 
Libelluline, i.e. by far the greatest number of the Newroptera, have very numerous 
(30—40) short vasa urinaria, like the Orthoptera; those which undergo a perfect 
metamorphosis only six or eight ; see L&on Durour, Mém. présentés, Tom. vi., and 
Loew in GERMAR’S Zeitschrift fiir die Entomologie Iv. (1813), s. 423, &e. (Bemer- 
kungen iiber die anatomischen Verhdltnisse der Newropteren.) 
