British Species of Caddis-flies. 161 
apparently two-jointed ; app. inf. absent; from the middle of the 
ventral margin of the last segment proceeds a long horny lobe. 
The apex of the abdomen in the female is obtuse, forming a 
cylindrical tube, from which proceeds a small ovipositor- 
Larva inhabiting running waters; without external respiratory 
filaments. Case formed of stones, arranged in an irregular heap. 
Cocoon thinner than in Rhyacophila. 
1. Glossosoma Boltoni, Curtis. 
Glossosoma Boltoni, Curt. (*) Phil. Mag. p. 216, 1 (1834); 
Steph. Ill. p. 161, 1; Hag. (*) Ent. Ann. 1860, p. 82, 81; 
Kol. Gen. et Spec. Trichop. pt. 2, p. 200, 2; Rhyacophila 
vernalis, Pict. (*) Recherch. p. 189, 13, pl. 15, fig. 4 (1834) ; 
Burm. Handb. p. 909, 3. 
Antennz brownish-testaceous, annulated with brown. Head, 
palpi and mesothorax brown, the head clothed with sparse grey- 
ish pubescence. Anterior wings brownish-grey, the apical portion 
clothed with pale golden pubescence, forming rather indistinct 
spots round the apical margin at the arculus and on the disc, 
which are most conspicuous in the male and during life; neura- 
tion brown; fringes grey. Posterior wings greyish, subhyaline, 
with grey fringes. Legs brownish-testaceous, the spurs dark brown. 
Abdomen dull dark-brown above, somewhat ochreous beneath. In 
the male, the ventral surface of the antepenultimate segment has 
a broad obtuse spoon-shaped lobe; the penultimate segment has 
a small projecting triangular tooth; a broad rounded cover-like 
lobe proceeds from the upper margin of the last segment, forming 
as it were a continuation of it; beneath this are two nearly 
straight pieces, which I consider the app. intermed.; app. sup. 
lying on each side of the lobe, apparently bisarticulate, the basal 
portion short and broad, the apical portion obtuse and curved, 
beset with rather long brown hairs; app. inf. apparently wanting; 
penis (or penis-cover?) broad, the apical portion fringed with 
black hairs; ventral lobe very long, dilated and concave in the 
middle, the apical portion produced into a long fine point; all 
the appendages yellow. In the female there is a small tooth on 
the ventral surface of the antepenultimate segment ; and the apex 
of the abdomen is provided with a slender exserted ovipositor. 
Expanse of fore-wings 9—10 lines. 
Larva with the head and pronotum black, the latter hexagonal 
inform. Mesonotum and metanotum clear red, bordered laterally 
with black. (Pictet.) 
VOL. V. THIRD SERIES, PART 1.—ocT. 1865. M 
