128 Mr. R. M‘Lachlan’s Monograph of the 
Abdomen blackish, with whitish lateral lines. In the male the 
superior horny lobe is short, narrow and black, the membranous 
parts beneath it yellow; app. sup. short, subrotund, yellowish ; 
app. inf. yellow, the basal joint cylindrical, dilated towards the 
apex, the upper side marked with brown and furnished with long 
hairs, apical joint short, yellow, obtuse, scarcely dilated; penis 
cylindrical, testaceous, darkest at the tip, which is deeply cleft, 
with a scarcely-perceptible lateral subapical projection. 
Expanse of fore-wings 10—12 lines. 
A widely-distributed species. Smaller and with narrower wings 
than the last, and more sharply marked. It varies exceedingly 
in coloration; examples from the north are much darker than 
those from the south. The almost entire absence of subapical 
projections on the penis will serve to distinguish it from allied 
native species, but I am uncertain whether it has been found 
and named on the Continent; I have never seen a continental 
example. 
This is certainly not the H. atomaria of Pictet. Dr. Hagen 
informs me that a type of H. Danubu of Brauer, in his collection, 
agrees with lanceolata in coloration ; a specimen of Danubii in my 
collection (from Zeller), named by Dr. Brauer, does not at all re- 
semble this, and in colour is scarcely distinguishable from angusti- 
pennis of Curtis. 
4, Hydropsyche angustipennis, Curtis. 
(Pl. II. fig. 8, larva and pupa.) 
Philopotamus angustipennis, Curt. (*) Phil. Mag. p. 213, 9 
(1834) ; Hydropsyche angustipennis, Steph. (*) Hl. p. 178, 
7; Philopotamus fulvipes, Curt. (*) Phil. Mag. p. 213, 9b 
(1834)?; Hydropsyche fulvipes, Curt. (*) Brit. Ent. pl. 601 ?; 
Steph. (*) Ill. p. 174, 8; Hag. (*) Ent. Ann. 1861, p. 15, 
107. 
Antenne brown, the oblique dark lines not conspicuous. Head 
thickly clothed with yellowish pubescence. Palpi brown. Meso- 
thorax dark blackish-fuscous. Anterior wings golden-brown, 
faintly irrorated with paler spots (when alive); a pale elongate 
spot on the dorsal margin (conspicuous when alive); fringes paler 
than the ground colour. Posterior wings smoky, with pale 
fringes. Legs pale brownish-ochreous. Abdomen dark blackish- 
fuscous, with whitish lateral lines. In the male the superior 
horny lobe is short, black and obtuse, the membranous parts be- 
neath it bright yellow; app. sup. blackish, obtusely triangular ; 
