64 Mr. R. M‘Lachlan’s Monograph of the 
are scen to approximate at the base and tips and recede gradually 
in the middle, owing to the curvature; penis and its sheaths not 
visible. 
Expanse of fore-wings 17—18 lines. 
I found this species not uncommonly about some of the moor- 
streams in the Black Forest at Rannoch, Perthshire, in the be- 
ginning of June, 1865, but saw only the male. It is recognizable 
by its uniform smoky-fuscous coloration, resembling in no small 
degree Limnephilus fumigatus, and by the absence of markings on 
the wings, save the two pale dots; the form and arrangement of 
the appendices differ somewhat from the other species of the 
group, especially the insertion of the app. inf. 
The discovery of this insect was made too late for me to give 
figures of the appendices, which must be reserved for a future 
occasion. 
Genus Hatesus, Stephens. 
Antennz moderately stout, basal joint nearly as long as the 
head. Head somewhat produced in front between the antenne. 
Eyes large, prominent. Maxillary palpi in the male long and 
thin, joints slightly compressed, basal joint short but not much 
thicker than the others, two succeeding joints long and of nearly 
equal length ; in the female the basal joint is short, the second, third 
and fifth are long and nearly equal, the fourth a little shorter than 
the fifth and slightly stouter. Labial palpi with short basal joint, 
second and third joints longer and nearly equal. Prothorax small 
but distinct, hairy. Mesothorax large, oval, very convex above, 
and with a broad median impressed line. Anterior wings slightly 
hairy, narrow at the base, but expanding very much towards the 
apex, which is parabolic; dorsal margin gradually curved from 
base to apex; neuration moderately strong, costal space broad, 
radius with a slight bend before the termination, discoidal cell 
long and narrow, all the apical cells reaching the anastomosis. 
Posterior wings hyaline or subhyaline, scarcely so long as the an- 
terior but much broader, with large anal space; in some species 
there is a fold following the course of one of the costule, in 
which is concealed a pencil-like tuft of long hairs. Legs long, 
tibize and tarsi spinose ; anterior tibiz with one rather long apical 
spur ; intermediate and posterior tibize each with one rather short 
median and two rather long and slightly unequal apical spurs. 
Abdomen not very robust, laterally compressed ; the male is fur- 
nished with not very prominent appendices, and sometimes with 
large serrated penis-sheaths ; the extremity of the abdomen in the 
