we British Species of Caddis-flies. 113 
A rare insect in this country. It has been taken in summer at 
Ringwood, Exeter, Hyde Park, &e. 
The neuration of the posterior wings does not differ in the sexes 
of this species. In both, the arrangement of the nervures is as in 
the female of 7. bicolor. (See Pl. VI. fig. 4.) 
Genus Mysracipss, Latreille. 
Antenne thin, about twice as long as the wings, the basal joint 
thick and as long as the head. Eyes larger and placed closer 
together in the male than in the female. Maxillary palpi long and 
hairy ; the basal joint longer than in Leptocerus ; second and 
third joints very long, nearly equal and somewhat flattened, the 
hairs arranged in two rows; fourth and terminal joints shorter 
and thinner, nearly equal. Labial palpi very small. Mesothorax 
ovate, very convex. Anterior wings long and narrow, with 
dense short hairy clothing; in repose the apices are inflexed and 
approximate; costal margin nearly straight, with a small notch 
near the apex ; neuration alike in both sexes; discoidal cell long 
‘and narrow, closed ; first apical cell long; anastomosis oblique. 
Posterior wings rather shorter than the anterior, and about the 
same breadth, folded; about the middle of the costal margin 
there is a row of minute hook-shaped bristles, which fit into a nar- 
row fold on the dorsal margin of the anterior wings, and connect 
the wings when extended (analogous to what is found in the [Hy- 
menoptera); discoidal cell open; the ramus discoidalis does not 
appear to reach the radius, but has its origin in the membrane ; 
fringes very long. Legs rather long; the anterior tibiz appear to 
have no spurs; intermediate and posterior tibiz each with one 
pair of short apical spurs. Abdomen thin. In the male there is 
a variously-shaped lobe projecting from the upper margin of the 
Jast abdominal segment ; app. sup. Jong and finger-shaped ; app. 
intermed. long with fine needle-shaped points ; app. inf. curved 
upwards; there is also a large ventral plate, generally with a 
forked apex, differing in form according to the species. In the 
female there are two very large dilated lateral valves. 
Larva inhabiting standing and running waters, similar to that of 
Leptocerus. Case a tube composed of fine sand, to the outside of 
which are affixed pieces of twigs and other vegetable matters. 
In the works of most writers on these insects the genus Mysta- 
cides has included all the long-horned Leptoceride (Pictet even 
includes Odontocerus), but it was restricted by Hagen (Ent. Ann, 
1860) to the three species (all of which inhabit this country) in 
VOL. V. THIRD SERIES, PART 1.—ocT. 1865. I 
