the Hydroptilidce. 133 
wards; the discoidal cell open, the anterior branch of the 
ramus discoidalis simple, the posterior forked with the an- 
terior prong simple, the posterior prong forked ; the superior 
branch of the ramus thyrifer forked, the anterior prong 
forked, the posterior prong simple ; thus there are two 
adjacent apical forks. The posterior wing with adpressed 
hair and very long fringes, the costa shallowly concave in 
the second third, and with one transverse veinlet; the 
ramus discoidalis forked, the anterior prong simple, the 
posterior prong forked; the ramus subdiscoidalis forked 
with simple prongs ; thus there is one apical fork. Legs 
of moderate length, the posterior tibiae and the base of 
the posterior tarsus strongly fringed externally ; anterior 
tibia spurless, intermediate with two spurs, the posterior 
with four. Abdomen with conspicuous appendices, which 
vary in number Avith the species ; penis setiform, retracted 
during life, sometimes dilated at the tip ; the horny pro- 
cess of the male antepenultimate segment is enclosed by 
long hairs from the segments. 
I can add nothing at present to what has already been 
published concerning the larva and its case, living as I do 
in a neighbourhood unsuitable for their investigation. 
The species affect rivers and lakes. They occur 
throughout Europe, from Sweden to Sicily, and fi'om 
Ireland to Attica ; also in Canada and Texas. 
Pkrixocoma sparsa. 
PI. II. 1. $ neuration, 1 b, 2 genitalia ; III. 1 — 1 a, $ 
genitalia, 1 b, maxillary palpus. 
Hydroptila sparsa & vectis, Curt. 1834; H. hrunnei- 
cornis, Ste. 1836 (nee Pict.); i/. tineodes, Burm. 
1839 ; H. tineoides, Zet. 1840 (nee Dalm.). 
Head and prothorax satiny white, frons with some 
blackish hairs ; palpi whitish ; antennte sometimes pale 
throughout, sometimes dark throughout, at other times 
with more or less of the terminal third alone dark, or with 
a pale ring beyond the middle. Anterior wings black, 
with glossy white markings, viz. : a large not sharply 
defined blotch near the base of the post-costa which does 
not reach the costa ; an almost oblique fascia before the 
middle, which enters both fringes, and is enlarged most in 
the fringes of the inner margin ; this is followed by a dot 
in the middle of the disk ; this is succeeded by a pair of 
TRANS. ENT. SOC. 1873. — PART II. (mAY.) L 
