50 Mr. R. M‘Lachlan’s Monograph of the 
fuscous. Palpi pale fuscous. Prothorax reddish-fuscous, with 
long hairs. Mesothorax reddish-fuscous. Anterior wings rather 
broad, grey, with a yellowish tinge, with numerous brown 
freckles over the whole; a fuscous streak from the middle 
of the base, and another along the sutural margin; the wings 
are very uniform in colour, and vary very slightly; veins 
fuscous, the longitudinal ones with paler points, the anasto- 
mosis rather darker; the discoidal cell about the same length as 
the footstalk. Posterior wings hyaline, slightly grey at the 
apex; veins yellowish-fuscous, the ramus discoidalis forks rather 
before the ramus subdiscoidalis. Legs greyish-testaceous, with 
black spines. Abdomen fuscous above, ochreous beneath. In 
the male the upper margin of the last abdominal segment is 
deeply emarginate, bent under, black and scabrous, with a some- 
what cylindrical projection on either side; app. sup. yellow, 
somewhat spoon-shaped, slightly curved; app. intermed. very 
short, triangular, with black tips; app. inf. large, the tips intensely 
black and furnished with two teeth. In the female there are 
short triangular superior valves, covering a short tubular piece. 
Expanse of fore-wings 12—13 lines. 
Not very uncommon in some localities in the neighbourhood of 
London, &c., appearing at the end of summer. 
This and the two following species demonstrate most forcibly 
the value of the characters afforded by an examination of the anal 
appendages in the T'richoptera. These three species are at first 
sight so very similar that an experienced Entomologist might be 
readily pardoned for considering them identical, yet the-appen- 
dices prove that they are very distinct, and further examination 
shews other distinctive characters in the neuration, &c. 
21. Limnephilus hirsutus, Pictet. (Pl. X. figs. 13, 14, app.) 
Phryganea hirsuta, Pict. Recherch. p. 159, 29, pl. ii. fig. 10 
(1834) ; Hag. (*) Stett. Zeit. 1861, p. 117. 
In general form and colour almost entirely similar to the last 
species, but smaller ; the anterior wings rather narrower, especi- 
ally in the male; the discoidal cell much longer and narrower, 
being nearly twice the length of the footstalk. In the male the 
upper margin of the last abdominal segment is broadly rounded, 
with long hairs on the surface of the segment; app. sup. broadly 
and obtusely spoon-shaped, yellow; app. intermed. almost as long 
as the app. sup., widely diverging ; app. inf. short, yellow, fringed 
with long hairs. In the female there are two short superior valves. 
