British Species of Caddis-flies. 107 
from the splash of the sculls, they form two continuous lines, ex- 
tending for miles. When in copuld they soar to considerable 
heights, the female alone using her wings, and carrying with her 
the male hanging helplessly. 
I have found, but much less commonly, specimens of slightly 
larger size, with the wings brown rather than cinereous, and with 
the markings more distinct and yellower in colour. I am not 
certain whether these may not prove distinct, but am unable to 
detect any difference in the arrangement of the appendices. 
I strongly suspect that M/ystacides annulata of Pictet is identical 
with ZL. cinereus ; there is a type in the British Museum, but I 
cannot speak positively as to its identity. 
7. Leptocerus aterrimus, Stephens. (PI. XII. figs. 18, 19, app.) 
Leptocerus aterrimus, Steph. (*) Ill. p. 200, 20 (1836); M‘Lach. 
Ent. Ann. 1862, p. 32; L. ater, Steph. (*) Ill. p. 196, 5 
(1836); ZL. caliginosus, Steph. (*) Ill. p. 201, 9 (1836); 
L, niger, Steph. (*) Hl. p. 196, 6 (1836), part; Phryganea 
nigra, Lett. Ins. Lapp. col. 1072, 53; Mystacides niger, 
Kol. Gen. et Spec. Trichop. pt. 2, p. 257, 10, pl. 3, fig. 31; 
Leptocerus perfuscus, Steph. (*) Ill. p. 196, 7 (4836), var. 
. Antenne brownish-black, annulated with white on the basal 
third. Head and palpi black, clothed with brown hairs, Meso- 
thorax rather shining black. Anterior wings dull dark brownish- 
black; an ochreous spot at the arculus (little visible in dead 
specimens), Posterior wings rather paler, and the neuration 
more distinct. Legs brown, the tarsi with paler rings. Abdomen 
blackish-brown witb pale lateral lines. In the male the app. sup. 
are short and very broad, obtusely rounded and fringed with long 
pale hairs; app. inf long and curved upwards, attenuated towards 
the apex. In the female there is a divided superior lobe, somewhat 
like that of the male ; lateral valves small, obtuse and yellowish. 
Expanse of fore-wings 8-—10 lines. 
Common in summer about ponds and canals, especially in the 
neighbourhood of London. 
With the typical form there are generally to be seen individuals 
with much paler (reddish-brown) anterior wings ; these may be 
frequently found in copu/d with the black specimens, and are simply 
varieties, 
The type of L. perfuscus of Stephens appears to be one of these 
light-coloured specimens, rather paler than usual. I possess 
several examples from Germany almost precisely similar. It ~ 
