British Species of Caddis-flies. 111 
narrow, closed ; first apical cell short, not reaching the anastomo- 
sis; the inferior branch of the ramus discoidalis appears to be 
twice-forked, the three veins meeting and forming a more or less 
distinct trident (differing according to the species), Posterior 
wings rather shorter and broader than the anterior, folded. Cos- 
tal margin slightly excised before the apex ; discoidal cell open; 
in the male the upper branch of the ramus subdiscoidalis crosses 
the lower branch of the ramus discoidalis, an arrangement which 
is somewhat modified (in 7’. bicolor) in the female (see Pl. VI. 
fizs. 4, 4a). Legs not long; the anterior tibia furnished with a 
pair of minute apical spurs; intermediate and posterior tibia 
each with a single pair of longer apical spurs. Abdomen thin in 
the male, rather robust in the female. App. sup. in the male 
finger-shaped, placed close together on the middle of the upper 
margin; app. inf, long and curved; penis very long and exserted. 
In the female (of 7. bicolor) there are two enormously developed 
lateral valves. The female is always larger than the male. 
Larva unknown, inhabiting still waters. 
I have formed this genus to receive two species, which, from 
the arrangement of the nervures, &c., cannot be retained in any 
of the previously described genera. A reference to the figures 
will give a better idea of those characters in the neuration, so 
difficult to explain in words. 
1. Trienodes bicolor, Curtis. 
(Pl. VI. fig. 4, neuration, maxillary palpi, antenna; Pl. XII. 
figs. 25, 26, app.) 
Leptocerus bicolor, Curt. (*) Phil. Mag. p. 214, 15 (1834); L. 
rufogriseus, Steph. (*) Hl. p. 201, 24 (1836); Mystacida 
Jferruginea, Ramb. Hist. Nat. Névrop, p. 512, 10 (1842); 
Phryganea tineoides, Scop. Ent. Carn. p. 267, 694 (1763) 2; 
Leptocerus tineoides, Hag. (*) Ent, Ann. 1860, p. 72, 66. 
Antenne brown, broadly annulated with white to near the 
apex, basal joint clothed with reddish-brown hairs. Palpi red- 
dish-brown. Head and thorax black, clothed with reddish-brown 
hairs. Anterior wings very narrow in the male, broader in the 
female; uniform reddish-brown; the two forks of the lower 
branch of the ramus discoidalis meet near the transverse vein 
closing the discoidal cell, with a long transverse vein beneath 
them (thus the third and fourth apical cells are acute at the base). 
Posterior wings black. Legs greyish-brown. Abdomen fuscous, 
with pale lateral lines. In the male there is a short lobe from the 
