British Species of Caddis-flies. 137 
very long, extending to near the middle of the cell; fork 3 short. 
Posterior wings greyish-black. Legs pale-brownish ochreous. 
Abdomen fuscous. In the male the lobe from the upper margin 
of the last segment is somewhat emarginate at the apex; app. inf. 
with the basal joint long and nearly straight, thickened at the tips, 
the second joint shorter and thinner, curved inwards and upwards, 
the tips approximating ; penis with a dark shining-brown apex. 
Expanse of fore-wings 6—7 lines. 
A local insect, appearing in summer and the beginning of 
autumn. Occurs near Plymouth and Corwood in Devonshire, 
Hastings and Scarborough ; common in Hawthornden, near Ros- 
lyn, N. B. 
Pictet’s name was applied to this insect by Stephens with a 
mark of interrogation; the fuvomaculatus of the former author is 
a Polycentropus; it is not probable that the two genera, as now 
characterized, can be confounded, and it is better to retain Ste- 
phens’ name than to increase the number of synonyms. 
Genus Putitorotamus, Leach. 
Antenne stout, slightly shorter than the wings; basal joint 
swollen, much shorter than the head; the remaining joints short. 
Head large, convex above, very hairy. Eyes prominent. Ocelli 
present. Maxillary palpi long; two basal joints short and stout, 
scarcely longer than broad ; third joint longer than the two first 
together, somewhat flattened ; fourth somewhat shorter than the 
third ; fifth nearly as long as the others united. Labial palpi 
much smaller, two basal joints moderately long, the third nearly as 
long as the other two united. Mesothorax about as broad as the 
head, scarcely hairy. Anterior wings short and rather broad, with 
the tips elliptical, the costal and dorsal margins slightly rounded ; 
hairy clothing short and dense ; a transverse vein unites the costa 
and subcosta before the middle ; discoidal cell short, closed ; apical 
forks 1, 2, 3, 4 and 5 all present, 1, 3 and 4 short ; an oblique 
transverse vein unites the upper edge of the discoidal cell to 
the radius ; a straight one unites the lower branch of the inferior 
fork of the ramus discoidalis to the upper branch of the superior 
branch of the ramus thyrifer ; another closes the cellula thyridii, 
and two others are placed further towards the base of the wing, 
Posterior wings almost as long as and nearly similar in form to 
the anterior ; ferks 1, 2, 3 and 5 present; discoidal cell closed. 
Legs long ; intermediate tibige and tarsi not dilated in the female ; 
anterior tibiae with two rather long and equal apical spurs ; in- 
