British Species of Caddis-flies. 109 
white. Head, palpi and mesothorax black. Anterior wings 
black, a white spot near the base towards the dorsal margin, a 
conspicuous white spot at the arculus and another opposite to it 
on the costal margin, the two nearly meeting and forming an in- 
terrupted fascia ; beyond this is an oblique white spot towards the 
costa near the apex; (these markings are most distinct in the 
females and are sometimes scarcely visible in the males, especially 
in dead specimens). Posterior wings black. Legs brownish, the 
anterior and intermediate tibize and tarsi whitish, the tarsi spotted 
with brown. Abdomen blackish with pale lateral lines. In the 
male the app. sup. are long, finger-shaped and hairy; beneath 
them is a long and somewhat pointed upper penis-cover ; app. 
inf. curved upwards, the apex furnished with a small second 
joint. In the female there are two pointed valves. 
Expanse of fore-wings 64—9 lines. 
Larva with the head and thorax pale yellow. On the head is a 
series of black points, forming an almost complete circle. The 
divisions of the thorax bordered with black, with hairs of the same 
colour. Abdomen greenish, with the respiratory filaments short 
and distant. Feet yellow, with black hairs; the posterior pair 
very long. (Pictet.) 
Case cylindrico-conical, slightly curved, composed of sand and 
small stones. (Pictet). 
An abundant species in many places, frequenting rapid streams 
and appearing in summer and autumn. It delights to fly in 
swarms in the bright sunshine, and also in the evening, just above 
the surface of the water. Particularly abundant about Haslemere 
in Surrey, and Dawlish in Devonshire. 
10. Leptocerus albifrons, Linné. (PI. XII. figs. 23, 24, app.) 
Phryganea albifrons, Linn. Faun. Suec. n. 1495 (1761); Syst. 
Nat. ed. 12, p. 910, 18; Oliv. Encye. Méthod. vi. p. 517, 
86; Zett. Ins. Lapp. col. 1072, 51; Mystacides albifrons, 
Pict. (*) Recherch, p. 168, 8, pl. 13, fig. 5; Brauer, Neu- 
rop. Aust. p. 41; Kol. Gen. et Spec. Trichop. pt. 2, p. 
259, 12, pl. 3, fig. 29; Mystacida albifrons, Ramb. Hist. Nat. 
Névrop. p. 510, 6; Leptocerus albifrons, Hag. (*) Ent. Ann. 
1860, p. 73, 68; Phryganea interrupta, Don. Brit. Ins. vol. 
16, pl. 551 (1813), not of Fabr.; Leptocerus interruptus, 
Steph. (*) Ill. p. 198, 12; LZ. bilineatus, Steph. (*) Ill. p. 200, 
21 (1836). 
Antenne black, annulated with white. Vertex and basal joint 
