254 
[April, 
and began to re-appear at first singly, then several together, and then 
each cut out for itself a tiny film from the under cuticle of the leaf, 
and floated away on it just as I have described above, and by the 18th 
of the month the w ater was crowded with tiny cases not one-eighth of 
an inch long. After moulting the black colour of the head of the 
larva became brownish ochreous, the collar-plate still black, the body 
dirty whitish with broad greenish dorsal vessel, and by help of a strong 
lens I could see the fine opaque whitish tracheal thread ; the larv® 
continued to thrive and were frequently making fresh cases, half at a 
time, until the period arrived for hibernation, when the cases were 
spun up fiat against the leaves, and, content with what I learnt, I sent 
them adrift to take their chance in a state of freedom. 
Emsworth : March c 6rd, 1881. 
DESCRIPTION OP A NEW SPECIES OF TRICIIOPTERA (POLY- 
CEE TROPES KIR G I) FROM SCOTLAND. 
BY il. McLACHLAN, F.R.S., &c. 
Expanse, $ , 14£ — 16£ mm., 9, 17 — 18 mm. 
Strathglass, Inverness-shire, August, J. J. King , about twenty 
examples. J 
Like most other species of the genus, this is practically separable 
