British Species of Caddis-flies. Wa, 
ridium more conspicuous, and the veins darker. Posterior wings 
subhyaline, faintly yellowish at the apex, and with the-ptero- 
stigma also yellow. Legs testaceous. Abdomen fuscous above, 
ochreous beneath, with testaceous appendices. In the male the 
lobe from the middle of the upper margin of the last segment is 
short and very broad, almost square, but with the corners rounded, 
concealing the app. sup.; app. inf. very long, first joint shortest 
and truncated, second joint longer, broad at the base, then sud- 
denly very obliquely excised, the apex much produced and slightly 
incurved ; sheaths very short and straight; penis apparently di- 
lated and notched at the end. In the female the truncated mar- 
gins of the valves are rather suddenly and deeply notched. 
Expanse of fore-wings 12—13 lines, 
This species is common along all the mountain torrents of 
North Wales in September, often at considerable elevations. I 
have also seen examples from North Devon, Staffordshire and 
Scarborough. 
I believe that the female described in the Ent. Ann. 1863 
belonged to R. dorsalis ; however, I met with undoubted females 
of obliterata (described above) in the autumn of 1863; they are 
much rarer than the males. 
Of the described European species belonging to this section, 
R. obliterata is allied in form to R. fasciata, Hagen, of which I 
possess a continental example. This differs in its decidedly fasci- 
ated anterior wings, and in the form of the superior lobe, which 
is much longer, and does not entirely cover the app. sup. 
R. vulgaris, Pict., as before mentioned, is very closely allied to 
R. dorsalis, Curtis. R. paupera, Hagen (which I possess from 
Sweden), is somewhat similar to dorsalis but darker, the penis- 
sheaths straight, the superior lobe narrow, but not dilated at the 
apex, and not so long as the app. sup. A&. torrentium, Pict. (=A. 
Armeniaca, Guérin), is the largest of the European species, and 
differs considerably from the others. MR. ferruginea, Scopoli, 
Hagen, somewhat resembles fasciata in the form of the appen- 
dices, and still more the next following, R. septentrionis, with 
which it may perhaps be identical. 
3, ‘Rhyacophila septentrionis, n. sp. 
Rhyacophila ferruginea, Hag. Stett. Zeit. 1859, p. 133, 42 
Antenne testaceous, with indistinct paler annulations. Head, 
palpi and mesothorax pale brown; the former with scattered 
golden hairs. Anterior wings broad, the apex nearly elliptical, 
