British Species of Caddis-flies. 143 
Legs long, the intermediate tibia and tarsi not dilated in the female ; 
anterior tibiae with one long median and two long apical spurs ; 
intermediate and posterior tibize each with two pairs of long un- 
equal spurs. Abdomen short and thin. In the male there is a 
short lobe from the upper margin of the last segment, beneath 
which lies a penis-cover ; app. sup. small and broad ; app. inf. 
long and pointed. 
Larva inhabiting streams; elongate. Pronotum very small and 
transverse. Legs moderately long. Abdomen without external 
respiratory filaments, but fringed with hairs; anal crotchets 
very long. 
Pupa furnished with external respiratory filaments, one placed 
on each side of each segment. 
Case a heap of small stones lightly held together. A firmer 
case is constructed when the larva is about to change to a pupa. 
1, Plectrocnemia conspersa, Curtis. (Pl. VII. fig. 8, neuration.) 
Philopotamus conspersus, Curt. (*) Phil. Mag. p. 213, 5 
(1834); Plectrocnemia conspersa, Hag. (*) Ent. Ann. 1861, p. 
2, 87; M‘Lach, Ent. Mo. Mag. vol. i. p. 26; JZydropsyche 
senex, Pict. (*) Recherch. p. 219, 28, pl. 19, fig. 1 (1834) ; 
Plectrocnemia senex, Steph. (*) Ill. p. 168, 1; Brauer, 
Neurop. Aust. p. 39. 
Antennz brown, annulated with yellow. Head fuscous in fresh 
specimens, with a tuft of silvery hairs between the antenne. 
Palpi testaceous. Prothorax clothed with pale yellowish-white 
hairs in the middle and with blackish hairs on each side. Meso- 
thorax brown. Anterior wings ashy-grey, with fuscous markings 
forming irregular oblique streaks and reticulations ; apical margin 
regularly spotted with fuscous; fringes yellowish. Posterior 
wings pale grey, with darker veins, most conspicuous at the apex ; 
fringes pale grey. Legs testaceous. Abdomen fuscous above, 
paler beneath. In the male there is a short obtuse lobe from 
the middle of the upper margin of the last segment ; beneath this 
is a longer and rather pointed upper penis-cover; app. sup. 
broad, oval and hairy ; app. intermed. lying inside the app. sup., 
small and crooked at the tips; app. inf. long and hairy, placed 
close together at the base, gradually decreasing in size towards the 
prolonged apex, which is strongly directed upwards. Inthe female 
the apex of the abdomen is blunt, with two small valves. 
Expanse of fore-wings 9—12 lines. 
Larya with the head fawn-coloured, with black points forming a 
