164 Mr. R. M‘Lachlan’s Monograph of the 
projecting rather beyond the app. inf. and curved upwards and 
outwards, hook-like. In the female there is an exserted ovi- 
positor furnished with extensile filaments. 
Expanse of fore-wings 34—5 lines. 
Common about streams in many parts of the country. The 
long lobe on the ventral surface of the abdomen of the male renders 
this species easily recognizable. 
The type of 4. setiferus, Steph. Ill. p. 157, 5, is wanting. 
2. Agapetus comalus, Pictet. (Pl. XIV. figs. 14, 15, app.) 
Rhyacophila comata, Pict. Recherch. p. 194, 21, pl. 16, fig. 17 
(1834); Agapetus laniger, Steph. (*) Ill. p. 156, 3 (1836); 
A. ciliatus, Hag. (*) Ent. Ann. 1860, p. 81, 80. 
Antenne and palpi fuscous. Head and thorax pale fuscous, 
with yellowish hairs. Anterior wings greyish with an ochreous 
tinge, somewhat iridescent; fringes concolorous. Posterior wings 
pale grey, with concolorous fringes. Legs ochreous, somewhat 
fuscescent. Abdomen pale fuscous. The lobe on the ventral 
surface of the antepenultimate segment in the male short, straight 
and obtuse, not reaching nearly to the apex of the abdomen; on 
the penultimate segment is a tuft of long hairs; app. sup. very 
small ; app. inf. long, dilated at the tips, not toothed within; penis- 
covers straight, with an extensile membrane between them; 
sheaths needle-shaped, quite straight, about the same length as 
the app. inf. In the female there is a notched tube whence pro- 
ceeds the ovipositor, which is furnished with extensile filamentous 
processes. 
Expanse of fore-wings 4—44 lines. 
Occurs about rivers in many parts of the country; very abun- 
dant along the Dee near Llangollen, in autumn. It is a paler and 
more delicate species than the last, and may be readily separated 
by the form of the ventral lobe in the male. 
Genus Bera, Stephens. 
Antenne slightly shorter than the wings, stout; the basal joint 
very long and thick, very hairy, with a tooth (or tuft of long 
hairs?) internally in the male; thinner in the female. Head 
nearly without hairs. Ocelli absent. Maxillary palpi very hairy; 
first joint short, the rest longer and nearly equal. Labial palpi 
with short basal joint, the two others longer and cylindrical. 
Mesothorax flattened above, smooth and polished. Anterior 
wings narrow at the base, much dilated before the apex, which is 
