British Species of Caddis-flies. 103 
ferent facies to the rest of the genus, the thorax being less hairy, 
and the posterior wings more decidedly triangular, 
2. Leptocerus grossus, M‘Lachlan. (PI. XII. fig. 11, app.) 
Leptocerus grossus, Steph. (*) Cat. p, 320, 3644 (1829) ; 
M‘Lach. Ent. Ann. 1862, p. 313; Z. cinereus, Steph. (*) 
Il]. p, 199, 17 (1836), not of Curtis; Hag. (*) Ent. Ann. 
1860, p. 69, 58; L. notatus, Hag. (*) Stett. Zeit. 1858, 
p- 122, not Mystacida notata, Ramb. 
Antenne pale brown, annulated with whitish almost to the 
apex. Head very thickly clothed with browish-ochreous hairs. 
Palpi brown. Mesothorax dark brown, with two rows of ochre- 
ous hairs above. Anterior wings with the apex dilated and 
obliquely truncated, pale reddish-brown, not thickly clothed, 
anal spot paler (but scarcely visible in dead examples) ; neuration 
distinct, fuscous. Posterior wings subhyaline, greyish, with yel- 
lowish anal fringes. Legs ochreous, the apices of the tarsal joints 
in the four anterior legs brownish. Abdomen dark brown, with 
pale ochreous lateral lines. A small triangular plate from the 
middle ef the upper margin of the last abdominal segment in the 
male, on each side of which are placed the very large, broad and 
acute, somewhat triangular, yellow app. sup. ; app. inf. small, 
curved inwards. (I have not been able to examine fresh speci- 
mens. ) 
Expanse of fore-wings 11—15 lines. 
A few specimens have been taken by Mr. Wormald at Ruislip 
Reservoir, Middlesex, and I also possess it from the Fen District. 
It is the largest British species. I have adopted Stephens’ 
Catalogue name solely to avoid giving a new one, though Ste- 
phens afterwards misapplied Curtis’ name cinereus to this species, 
The description of cinereus in Ent, Ann, 1860, p. 69, also belongs 
here. 
8. Leptocerus fulvus, Rambur. (Pl. XII. fig. 12, app.) 
Mystacida fuloa, Ramb, Hist. Nat. Névrop. p. 509, 3 (1842) ; 
Leptocerus fulvus, M‘Lach, Ent, Ann. 1862, p. 31; Mysta- 
cides ochraceus, Kol. Gen. et Spec. Trichop. pt. 2, p. 250, 2, 
pl. 3, fig. 27 (1859), not of Curtis. 
Antenne pale ochreous, with brownish annulations along two- 
thirds of their length. Head densely clothed with yellowish-ocbre- 
ous hairs. Palpi brown. Mesothorax brown, witha few ochreous 
hairs. Anterior wings brownish-ochreous, the extreme costal 
margin and an anal spot (indistinct in dead examples) yellowish ; 
