British Species of Caddis-flies. 149 
1. Cyrnus trimaculatus, Curtis. 
(PI. VIII. fig. 3, neuration; PI. XIV. fig. 3, app.) 
Philopotamus trimaculatus, Curt.(*) Phil. Mag. p. 218, 4 (1834) ; 
Polycentropus trimaculatus, Hag. (*) Ent. Ann. 1861, p. 4, 
91; Cyrnus trimaculatus, M‘Lach. Ent. Mo. Mag. vol. i. p. 
29; C. unipunctatus, Steph. (*) Ill. p. 175, 1 (1836); C. 
pulchellus, Steph. (*) Ill. p. 175, 2, part (1836). 
Antenne brown, with yellowish annulations. Head fuscous, 
clothed with greyish-yellow hairs. Palpi brownish-ochreous. 
Mesothorax fuscous. Anterior wings fuscous, rather thickly 
irrorated with very small golden-yellow spots, of which two or 
three at the anal angle are rather larger than the rest, and alternate 
with spaces of the dark ground colour; upper margin of the dis- 
coidal cell rather angulated at the point where the transverse vein 
unites it to the radius; cellula thyridii short, the transverse vein 
closing it placed almost in a line with that closing the discoidal 
cell. Posterior wings smoky-grey, with concolorous fringes. Legs 
ochreous, posterior tibiz and tarsi somewhat darker. Abdomen 
brown, scarcely paler beneath. The lobe from the middle of the 
upper margin of the last segment in the male is very short; app. 
intermed. short and straight; app. sup. very small; app. inf. 
large, short and broad, yellow, concave within, the apex almost 
truncated. In the female there are two short lateral valves. 
Expanse of fore-wivgs, ¢ 5—6 lines, @ 7—8 lines. 
A common species in summer and autumn about canals, marshy 
dikes, slowly-flowing rivers, &c. 
2. Cyrnus flavidus, M‘Lachlan. (Pl. XIV. fig. 4, app.) 
Cyrnus flavidus, M‘Lach. Ent. Mo. Mag. i. 29 (1864). 
Antenne very pale brown, with yellowish annulations. Head 
pale brown, with yellow hairs. Palpi pale browni!sh-ochreous. 
Anterior wings narrow, pale yellow, rather thickly but indistinctly 
reticulated with pale greyish-fuscous; apex regularly spotted 
with pale fuscous; discoidal cell not angulated; cellula thyridn 
rather long, the transverse vein closing it placed much further 
towards the apex than the one closing the discoidal cell. Legs 
pale yellow. Abdomen brown above, ochreous beneath. In the 
male the lobe from the upper margin of the last segment is small 
and rounded; app. intermed. absent; app. sup. larger than in the 
last species, obtuse at the apex; app. inf. larger, somewhat con- 
cave internally, the apex very obtuse, but more rounded than in 
C. trimaculatus. 
Expanse of fore-wings 6—8 lines. : 
oO 
