154 WATERCRESSES. 
For general purposes Caddis Worms may be described as long and 
nearly cylindrical, with scaly heads, furnished with strong jaws, having 
short teeth fitted for gnawing vegetable matter. The three segments 
next the head are leathery, and each bears a pair of legs. This part of 
the grub is exposed when in process of walking about by means of the 
three pairs of legs, the nine following abdominal segments remain in 
regular course within the case; and at the tail extremity are a pair 
of hooks, which help the grub in walking, or to fix itself where it may 
desire, as occasion requires. 
The largest of the “worms” sent me, when removed from their 
cases, were five-eighths of an inch in length. The head of a more 
or less brown tint, marked in the middle with a darker somewhat 
Y-shaped spot, pointing backwards, and on each side a broad brown 
streak, each slanting backwards also, so as to meet at the back of the 
head, thus forming a V, of which the point was just behind the stem 
of the Y. The first segment behind the head was banded across with 
dark brown and a lighter tint; the next variable in amount of brown 
in the different specimens; the third segment with a few scattered 
spots on a paler brown ground. ‘The three pairs of long claw-legs 
palish brown, darker above or outside; the body behind these segments 
pale, but marked on each side by a very clearly defined narrow dark 
line. The tail segments had a few long and strong black hairs; and 
the pair of hooks, of which the enlarged bases are placed one on each 
side of the tail segment, were of a brownish colour above. The power 
of these as a means of holding fast was very obvious by the manner 
in which they became accidentally attached to the finger. 
Altogether, and speaking generally, as there are twenty-four species 
of Limnephilus, of which the larve of many kinds have not yet been 
described, it seemed to agree very well with that of ‘the common 
aud generally distributed species of L. jflavicornis, Fab.” (See Mr. 
McLachlan’s ‘ Monograph,’ p. 33.) 
Later on in the year, 1 was favoured by Mr. Richard Coe, from 
another locality, Weston Farm, Albury, Guildford, with a number of 
specimens of ‘cases,’ of which some account may perhaps be of 
interest. The first I examined was cylindrical, three-quarters of an 
inch long by three-sixteenths of an inch wide, and was formed of small 
irregularly-shaped bits of stone, or minute pebbles; those towards the 
tail extremity were the smallest, so that they might be described as 
mere grains, and were mixed at the opening of the case, at the caudal 
extremity, with a little vegetable matter, like dead and faded Duck- 
weed. Another ‘case,’ an eighth of an inch shorter, was similarly 
formed of little pieces of stone, or pebbles, but with no difference in 
size at the caudal extremity. 
Besides the above there were two ‘ cases,” approximately half an 
