144 Kev. A. E. Eaton on 
submonlliforra, witli sparse closely adpressed hair which 
gives to the joints a subscutiform outline ; the basal joint 
rather larger than the others ; in repose they are ap])roxi- 
mated to each other and ascending. Plead and prothorax 
with dense shaggy hair. Ocelli present. Maxillary palpi 
filiform, with moderate slightly spreading hair, five-jointed; 
the first two joints very minute, subequal ; the third slightly 
shorter than the fourth; the fif^h slightly the longest. 
Labial palpi with the first joint very short, the second not 
so long as the third, which is oblong-ovate and slightly 
compressed. Wings linear lanceolate, acuminate, with 
very long fringes; the anterior scabrous, without an appen- 
dage to the inner margin, the discoidal cell open ; the 
anterior branch of the ramus discoidalis simple, the pos- 
terior branch forked with simple prongs; the superior 
branch of the ramus thyrifer forked with simple prongs ; 
thus there is a primary fork before and behind the apex ; 
the posterior wings Avith the costa elbowed near the base, 
and with adpressed hair ; the ramus discoidalis simple ; 
the ramus subdiscoidalis forked with simple prongs ; thus 
there is one primary fork behind the apex ; no transverse 
veinlet. Legs of moderate length, the posterior Avith the 
tibia and the base of the tarsus strongly fringed externally; 
anterior tibia s]iurless, intermediate with three spurs, the 
posterior with four. Abdomen Avitli small appendices and 
setiform penis ; the horny ventral lobe of the antepenulti- 
mate segment in the male very short. 
The English species occurs in ponds. The genus is 
represented in Great Britain, France, Germany (perhaps 
Switzerland), Turkestan and New Zealand. The Turke- 
stan and another species of doubtful locality are at present 
undescribed, and are in Mr. INI'Lachlan's collection ; the 
former being on loan from the INIoscoav Museum. 
Oxyethira costalis. 
PI. II. 5, neuration $ \ 5 a, posterior wing; III. 8 — 8 a, 
genitalia $. 
Ilydroptila costalis. Curt. 1834; H. tlneoides, Stcpli. 
1836; '^ H. Jiavicornis, Pict. 1834. 
Head and prothorax whitish-yellow (the colour of tow), 
frons with some blackish hairs; palpi smoky white; an- 
tennae pale fawn-colour throughout, sometimes Avith an 
indistinct narroAv ring before tlie tip dusky. Anterior 
wings black, Avith glossy, toAv-colourcd markings, viz. : a 
