IxEUROPTEHA. 
G5 
brown colour, cylindrical in shape, with a narrow point 
at the top; they are attached to the stems with the 
most precise regularity. I have often watched Sialis 
lutarius in the act of laying her eggs ; firmly holding on 
by her legs to the stem or leaf of a plant, such as a 
cctrex or sparganium, she bends down her abdomen and 
glues egg after egg upon it in the regular manner 
described. In about ten days 7 time the young larvae are 
hatched, when they drop into the water, where they 
pass their larval state. And certainly the larvae are 
ugly, ferocious looking fellows, of a shining brown colour, 
a strong pair of jaws, which they exhibit in a menacing 
way when disturbed. The abdomen has a fringe of fila¬ 
ments on either side—seven pairs in all. These are the 
branchial organs, and serve both for respiration and loco¬ 
motion. If a segment of the larva be cut off from the 
body, and placed with its attached filament under the 
microscope, one sees at first sight the function of these 
organs. The filament contains a delicate tracheal tube, 
with numerous arborescent branchlets, extending along 
its whole length ; near the base it joins a large lateral 
tracheal vessel. When the creature wishes to assume 
its pupa state, it crawls into a hole in the bank and 
forms a cell. In this stage it is inactive. 
The Pliryganiclce, or Caddis-flies, are by many Ento¬ 
mologists separated from the Order Neuroptera, and 
placed in an order by themselves, on account of the 
structure of the wings, the anterior pair of which is 
covered with hairs, hence the term proposed for them, 
the Trichopterci. The wings have no cross reticulations, 
and the manner in which the hairs are fixed on the first 
pair of wings reminds one of the scales in the butterfly’s 
