90 Mr. R. M‘Lachlan’s Monograph of the 
and are only visible from beneath. In the female the upper 
margin of the last segment is fringed with long hairs ; the superior 
valves appear to be united into a cover for the ovipositor, notched 
in the centre above. 
Expanse of fore-wings, g 7—8 lines, @ 11—12 lines. 
Apparently a local species, appearing in spring; it is said by 
Stephens to occur in the metropolitan district, but I have never 
been able to find it there. Found about Exeter, at Pitlochry 
(Perthshire), and apparently in abundance near Burton-on-Trent. 
Kolenati says, with respect to insects of this genus, ‘“‘ Immensa 
sed preecipue in regionibus septemtrionalibus prodeunt copia, ut 
nautis sint incommodo.” 
Fam. HYDROPTILIDE. 
Antenne stout, shorter than the wings, moniliform; ocelli 
present or absent; maxillary palpi in the males four-jointed, the 
joints somewhat cylindrical and hairy; in the females five-jointed ; 
labial palpi with a thickened apical joint; anterior wings very 
narrow, exceedingly hairy, neuration not visible unless the hairs 
be removed; posterior wings rather narrower than the anterior, 
less hairy, but with very long fringes, not folded; legs rather 
stout, the anterior pair without tibial spurs ; abdomen moderately 
stout for the size of the insects. All the species are minute. 
Larva frequenting both standing and running waters: Head 
and thoracic segments small; the abdomen much enlarged ; external 
respiratory filaments absent. 
Case flat, ovate, membranous. 
The species of which this family is composed bear at first 
sight far more resemblance to Micro-Lepidoptera than to Tri- 
choptera, and are constantly mistaken for the former. They 
are of very active habits, so much so as to render their capture 
difficult, although where they occur, most of them swarm in innu- 
merable numbers. At present very little is known concerning the 
specific, or even the generic differences, and the accounts given by 
various authors are very conflicting. The largest known species 
does not exceed 43 lines, the smallest 2 lines, in expanse. 
We apparently possess only two genera :— 
A. Ocelli present. Anterior wings with the 
costal and dorsal margins nearly parallel ; 
apex somewhat obtuse . . . . . . . Agraylea. 
B. Ocelli absent. Anterior wings running to 
an acute point at the apex Sie 2 Lo Hadroptia 
ee 
