British Species of Caddis-flies. 89 
the male, forked in the female. Posterior wings shorter than the 
anterior, about the same breadth; discoidal cell open; posterior 
branch of ramus discoidalis simple in the male, forked in the 
female; anterior branch of ramus subdiscoidalis simple in the 
male, trifid in the female; thus there are two apical forks in these 
wings in the male and four in the female. Legs rather long, 
tibia spineless ; anterior tibize with two short apical spurs ; inter- 
mediate and posterior tibize with one short median and two short 
apical spurs. Abdomen slender in the male, rather robust in the 
female ; anal appendices not well developed. 
Larva unknown to me. It has been suggested that a singular 
quadrangular case, formed of vegetable matters, may belong here ; 
see Pl. II. fig. 34, and Stett. Ent. Zeit. 1864, pp. 114, 115. 
This kind of case has been found in Devonshire by Dr. Leach and 
Mr. Parfitt. 
One species only is known to inhabit this country. 
It appears to me that Rambur is correct in describing the 
maxillary palpi of the males as three-jointed, as I fancy I can 
distinguish the sutures readily ; nevertheless the separation of the 
joints in these palpi in the males of this family is always attended 
with some uncertainty. 
1. Brachycentrus subnubilus, Curtis. 
(Pl. V. fig. 5, neuration and palpi; Pl. XII. fig. 9, app.) 
peer cones subnubilus, Curt. (*) Phil. Mag. p. 215, 3(1834) ; 
Steph. (*) Ill. p. 182, 1; Hag. (*) Ent. Ann. 1859, p. 105, 
50; B. concolor, Steph. (*) Il. p- 182, 2 (1836); B. costalis, 
Steph. (*) Ill. p. 182, 3 (1836); Digs anea tincta, Zett. Ins. 
Lapp. col. 1071, 14 (1840); Pogonostoma vernum, Ramb. 
Hist. Nat. Névrop. p. 490 (1842); Hydronautia maculata, 
Kol. Gen. et Spec. Trichop. pt. 1, p. 93, 1 (1848); HZ. verna, 
Brauer (*), Neurop. Aust, p. 44 (1857). 
Antenne, head, palpi and thorax black. Prothorax with a few 
grey hairs. Anterior wings greyish-brown, with large yellowish 
spots on the membrane and smaller spots round the apical margin; 
these spots are formed of yellowish pubescence, which is generally 
absent except in very fresh examples; veins fuscous, Posterior 
wings also greyish-brown, with pale-grey cilia. Legs with the 
thighs dark-grey, tibiz and tarsi testaceous. Abdomen blackish. 
In the male the last segment above is produced into a triangular 
plate, on each side of which is a large triangular app. sup.; the 
app. inf, are dilated at the end and clothed with yellowish hairs, 
