124 Mr. R. M‘Lachlan’s Monograph of the 
Or the usual tabular arrangement according to the number of 
spurs may be used, thus :— 
Spurs 3-4-4 . . . Plectrocnemia, Polycentropus, Cyrnus, 
Ecnomus, and Neureclipsis. 
Spurs 2-4-4 . . .« Hydropsyche, Tinodes, Diplectrona, 
Philopotamus, Wormaldia, and Psy- 
chomia. 
Genus Hypropsycue, Pictet. 
Antenne thin, usually longer than the wings and with the joints 
long, each joint, excepting the apical ones, having a dark oblique 
raised band; basal joint very short, thicker than the others. 
Head transverse, hairy. Ocelli absent. Maxillary palpi long; 
basal joint short; second, long and thick; third and fourth joints 
shorter; fifth as long as the others united. Labial palpi with two 
short basal joints and a long and thin terminal one. Mesothorax 
robust, broadly ovate. Anterior wings narrow at the base, much 
dilated at the obliquely truncated apex; hairy clothing short and 
thin; discoidal cell short and closed; a transverse vein on both 
the upper and under sides of the discoidal cell, another closing 
the cellula thyridii, another below this cell, and two others towards 
the base of the wing; forks 1, 2, 3, 4.and 5 all present, fork 1 short. 
Posterior wings folded, shorter and broader than the anterior, 
the apical portion of the costal margin shallowly excised; anal por- 
tion strongly developed ; fringes very short; discoidal cell closed ; 
one transverse vein above, and two or three below it; forks 1, 2, 
3 and 5 present. Legs long; intermediate legs of the females 
dilated ; anterior tibize with two short (sometimes scarcely evident) 
equal spurs ; intermediate aud posterior tibiae each with two pairs 
of long and rather unequal spurs. Abdomen slender in the male, 
robust in the female. In the male there is a narrow horny lobe 
from the upper margin of the last abdominal segment, connected 
with a broad membranous dorsal plate, beneath which, and _per- 
haps united to it, is an emarginate piece which may be considered 
the penis-cover; what I consider to be the app. sup. are two small 
pieces on the lateral margins a little above the app. inf.; the app. 
inf. are very long and bisarticulate, the first joint long and nearly 
straight, the second shorter and curved inwards, so that the tips of 
the two appendices approximate; the penis is long and extensile, 
and apparently without sheaths; at the apex it-is swollen and 
cleft, and often with subapical protuberances. In the female 
the apex of the abdomen is obtuse, and is furnished with a re- 
tractile piece which is corneous above; beneath this, and connected 
with it, is a fleshy semicircular apparatus, the margins of which 
