British Species of Caddis-flies. 95 
female there are long fuscous spaces, which do not however appear 
to be constant either in number, position or length; the male also, 
apparently, sometimes exhibits traces of similar dark spaces. 
Head clothed with fuscous hairs. Palpi testaceous. Mesothorax 
dark blackish-fuscous. Anterior wings rather short, greyish or 
blackish-fuscous (the female the darkest); there are several whitish 
spots, some of which form indistinct transverse fasciz ; fringes 
grey or blackish, with generally a few whitish hairs in the costal 
portion towards the apex, and others on the dorsal margin. Pos- 
terior wings grey, with concolorous fringes. Legs testaceous, 
sometimes brownish. Abdomen fuscous (greenish in the female), 
with pale margins. 
Expanse of fore-wings, ¢ 23—3 lines, 2 4 lines. 
Frequents streams. Extremely abundant in some localities, 
entering the rooms of houses situated near its breeding-places, and 
causing the windows and ceilings to appear as if thickly dotted 
with dark atoms; very nimble and difficult to capture. 
It is probable that this is Dalman’s species. The types of Ste- 
phens’ two species are certainly identical. Some of the males 
appear to have spotted, and others unicolorous, antennz; but the 
amount and position of the spots seem to be very variable ; hence 
I conclude that this character has no specific value. 
I know nothing of H. vectis of Curtis, not having made a suffi- 
cient examination of the types. It is given by Dr. Hagen as dis- 
tinct (in Ent. Ann. 1859). 
2. Hydroptila angustella, n. sp. (PI. I. fig. 5.) 
Antenne of the male fuscous, with a pale whitish space near 
the apex; of the female whitish, very faintly annulated, with 
three fuscous spaces, one about the middle, the second near the 
apex, and the third occupying the extreme apex. Head clothed 
with whitish-yellow hairs. Mesothorax fuscous. Anterior wings 
very narrow, dark fuscous, with an appearance of darker blackish 
streaks; the dorsal margin (especially in the female) broadly 
margined with whitish-yellow, from the base almost to the apex ; 
fringes grey, whitish-yellow on the costa and the pale dorsal 
margin. Posterior wings pale grey, with paler fringes; a few 
whitish hairs in the fringes of the costa in the female. Legs 
very pale whitish-testaceous. Abdomen greyish-fuscous, with 
silvery whitish margins, most evident in the female. 
Expanse of fore-wings, ¢ 3 lines, ¢ 4 lines. 
Of this species I possess three examples, two of which (¢ and 
