28 Mr. R. M‘Lachlan’s Monograph of the 
one long median and two long apical spurs, of which the inner is 
rather the longest; posterior tibiae with two long median and two 
apical spurs, the inner slightly the longest. Abdomen laterally 
compressed, robust in the female ; in the male the upper margin of 
the terminal segment is frequently produced ; appendices varying 
much, but the species usually have broad and large superior 
appendices, two long usually pointed intermediate appendices, 
and two short somewhat upcurved inferior appendices ; penis 
sheaths curved upwards and approximating, between them lies 
the somewhat flattened penis; the female is furnished with two 
pairs of valves, which are sometimes appendiciform. 
Larve inhabiting standing waters of no great depth, or very 
slowly running canals, &c. (See Pl. Il. fig. 11.) Some species 
appear to breed in boggy situations in which there is scarcely ever 
any surface water. 
Case always free, composed of a great variety of materials, ac- 
cording to the species and to the conditions under which it is placed. 
The species are numerous. They are all strongly-flying in- 
sects, and in the day-time may be frequently beaten from trees, 
often at a great distance from water. Marshy and fenny dis- 
tricts are the most prolific in species of this genus. 
As might naturally be expected, the species exhibit consider- 
able diversity of structure, and yet they bear to each other ana- 
logies so great that it is impossible to satisfactorily group them 
into distinct genera. ‘This has been attempted by Kolenati in his 
Monograph, and I have fallen in with his ideas so far as regards 
Colpotaulius and Grammotaulius, but am unable to apply his 
arrangement to the rest of the species; however I have here 
considered his genera as forming sections, with some slight 
modifications, 
In many species there is a certain character in the markings 
very useful in describing them, viz., the existence of two more 
or less distinct pale spaces, one placed obliquely about the 
middle of the wing, and termed the fenestrated spot; the other 
enclosing the anastomosing transverse veins, and termed the 
anastomosal space. 
A. Apical margin of anterior wings excised. 
(Glyphotelius, Steph., Glyphidotaulius, Kol.) 
1. Limnephilus pellucidus, Olivier. 
(Pl. IV. figs. la, 16, 1c, palpi ;-Pl. IX. figs. 11, 12, app.) 
Phryganea pellucida, Oliv. Encyc. Méthod. p. 541, 12; 
Pict. (*) Recherch. p. 146, 17, pl. 8, fig. 4; P. transparente 
