82 Mr. R. M‘Lachlan’s Monograph of the 
of the posterior wings, running parallel with the costal margin, 
and extending from the base to about two-thirds the length of the 
wing; this pouch is beset with coarse clavate hairs. The anal 
appendices are somewhat similar to those of Goéra, but Silo ap- 
pears to possess a more or less developed lobe between the app. 
intermed, in the male ; the ventral surface of the antepenultimate 
segment in the male is furnished with spine-like teeth. 
Larva inhabiting running waters, and similar in form to that of 
Goéra. Case also similar, but smaller. 
The larve of this genus are particularly subject to the attacks 
of an ichneumon (4grioptypus armatus), the life-history of which 
we owe to the researches of Professor Von Siebold. (See 
“‘Stettiner Entomologische Zeitung,” 1861, p. 59.) It would 
appear that infested larve spin a long appendage to their cases, in 
the shape of a narrow silken band exceeding in length that of the 
case; the use of this band is not evident. 
Kolenati has misapplied the generic term Silo to a very different 
insect. 
The species may be divided into two sections, according to the 
comparative length of the first apical cell in the anterior wings. 
Several of both sections occur on the Continent. 
A. First apical cell in the anterior wings not extending beyond 
the middle of the discoidal. (Pl. V. fig. 3 6.) 
1. Silo pallipes, Fabricius. 
(Pl. V. fig. 3, neuration; Pl. XII. figs. 1, 2, app.) 
Phryganea pallipes, Fab. Spec. Ins. 1, p. 388, 6 (1781); Silo 
pallipes, Curt. (*) Phil. Mag. p. 215, 1; Steph. (*) Ill. p. 
187, 1; Hag. (*) Stett. Zeit. 1859, p. 145, 1; Ent. Ann. 
1859, p. 103, 47; Zrichostoma picicorne, Pict. (*) Recherch. 
p. 174, 2, pl. 13, fig. 9 (1834); Aspatherium picicorne, Kol. 
Gen. et Spec. Trichop. pt. 1, p. 97, 2; Trichostoma nigri- 
corne, Pict. (*) Recherch. p. 175, 4, pl. 13, fig. 11 (1834); 
Goéra vulgata, Steph. (*) Ill. p. 188, 3 (1836). 
Antenne, head, palpi and thorax blackish-fuscous ; the basal 
joint of antennze, head and prothorax clothed with light brownish 
hairs, especially in the female. Anterior wings brownish-black in 
the male, very dark reddish-brown in the female. Posterior 
wings smoky-black, with purplish iridescence; cilia grey; the 
fold in the male conspicuously black. Legs pale testaceous, the 
thighs fuscescent. Abdomen dark brownish-black, with ochreous- 
grey lateral lines. In the male there is a straight obtuse shining 
testaceous lobe between the app. intermed.; app. sup. long, 
. ~t" @heew 
