36 Mr. R. M‘Lachlan’s Monograph of the 
rior wings rather narrow, yellow (or greyish-yellow), with fuscous 
markings ; the dorsal half of the wing is often wholly fuscous, 
with the exception of small dots of the pale ground-colour ; 
pterostigma fuscous, small; the large oblique fenestrated spot, 
a large anastomosal space (interrupted by the dark veins of the 
anastomosis and by brown dots), and a semilunate spot at the 
apex, all whitish-hyaline (in darkly-marked specimens these 
spots are very conspicuous, in pale ones sometimes scarcely 
visible). Posterior wings hyaline, yellowish at the tips; the 
beard on the first apical sector in the males smal] and often absent. 
Legs reddish-testaceous, with black spines. Abdomen greenish- 
fuscous, paler beneath. In the male the upper margin of the 
last abdominal segment is rounded and produced in the middle, 
and bent slightly under, scabrous and blackish; app. sup. rather 
small and triangular, testaceous; app. intermed. short and nearly 
straight, black; app. inf. short, testaceous, with long blackish 
marginal hairs. In the female the superior valves are testaceous, 
with short, pointed, black tips; Jateral valves broad and truncated. 
Expanse of fore-wings 10—14 lines. 
Larva with the head yellow, with numerous black dots ar- 
ranged somewhat in a V-shaped mark. Pronotum and mesonotum 
also yellow, with numerous black dots; on the pronotum many 
of these are arranged in two parallel rows. Metanotum dirty 
greyish-ochreous, with a few scattered black dots. Legs yellow- 
ish, spotted with black at the base, the tarsi wholly blackish- 
fuscous. Abdomen dirty greyish-ochreous, with whitish filaments. 
Anal crotchets yellow, marked with black, and with a few black 
hairs. 
Case a tube composed of small stones, &c., to the outside of 
which are affixed long twigs, pieces of wood, husks, &c.; these 
substances are often very much larger than the cases themselves, 
and give them a peculiar appearance, as the larve crawl along 
the bottom of ditches or ponds. 
A very common species in summer and autumn. 
With respect to L. affinis of Hagen, Ent. Ann. 1859, p. 79, 
I do not at present feel justified in giving it a place in our Fauna. 
I have seen types of L. affinis, which is certainly a very distinct 
species, although closely allied to Z. dunatus. It differs in the 
anterior wings being entirely of a straw-colour, without any fuscous 
markings excepting a very distinct pterostigma, in the curved 
apical line, which is broader than in L. dunatus, and in the pale 
semilunate space between it and the extreme apical margin, which 
is much narrower, reduced in fact toa mere line ; the fenestrated 
