96 Mr. R. M‘Lachlan’s Monograph of the 
@ ) were taken at Forest Hill (Kent) and Arundel, in the sum- 
mer and autumn, in both instances in the vicinity of standing 
water; the third I found near Kingston-on-Thames in July, 1865. 
I have been unable to identify them with any described species ; 
the female is a very distinct-looking insect, in consequence of the 
broad pale dorsal margin. There is a specimen in the Stephen- 
sian Collection, mixed up with the types of his HZ. sparsa. 
3. Hydroptila costalis, Curtis. 
Hydroptila costalis, Curt. (*) Phil. Mag. p. 218, 3 (1834); 
Steph. (*) Ill. p. 153, 5; Hag. Ent. Ann. 1859, p. 108, 55; 
H. brunneicornis, Pict. Recherch. p. 226, 3, pl. 20, fig. 12 
(1834)?; Kol. Gen. et Spec. Trichop. pt. 1, p. 106, 37; 
H., sparsa, Steph, (*) Ul. p. 152, 3 (1836). 
Antenne whitish, finely annulated with fuscous. Head clothed 
with whitish hairs. Palpi pale testaceous. Mesothorax brown. 
Anterior wings narrow, greyish-fuscous, with scattered silvery- 
white spots on the disc; fringes grey, a long, pale whitish space 
in the costal fringes, and the apical fringes also whitish. Posterior 
wings pale grey, with paler fringes. Legs testaceous, the tarsi 
faintly annulated with brown. Abdomen pale brownish, with 
paler margins. 
Expanse of fore-wings g 33 lines. 
I possess examples from Scotland, which I compared with 
Curtis’ types.- I have only seen males, and know nothing of the 
habits of the species. 
H. sparsa of Stephens appears to me to be clearly identical 
with costalis. The types of the former are three in number, of 
which one is the same as my angustella (p. 95). 
Fam. LEPTOCERIDZ. 
Antennz as long as or longer than the wings, often several 
times as long; basal joint generally long and stout, the remaining 
joints usually long, thin and cylindrical ; ocelli absent ; maxillary 
palpi five-jointed in both sexes, very hairy, the basal joint short, 
some of the succeeding joints very long, terminal joint not very 
long, flexible, but not multi-articulate ; anterior wings long and 
narrow (in the British genera), generally clothed with a short 
dense pubescence, neuration often differing in the sexes, discoidal 
cell generally closed; posterior wings shorter and generally 
broader than the anterior, usually folded, hairy clothing less 
