Hydroptilide belonging to the Huropean fauna. 81 
light is thrown into the cavity. The ventral plate is rather deeply 
excised with well-marked lateral lobes; from between the lobes 
springs a broad process which almost fills up the space between 
the lobes, and which tapers slightly towards the poimted apex; 
anteriorly, the margins of this process appear to be narrowly folded 
and are blackish along with the apex. Expanse of male about 
5 mm., female about 7 mm. 
Scotland (Redmyre Loch, near Carluke, about 600 ft., 
not rare, Morton); England (near Woodbury, and Ottery 
St. Mary, Devon, in July, Haton) ; Ireland (Knappagh 
Laogh and Cushinsheen Laogh, near Westport, J. J. 
King). 
A species abundantly distinct, on account of the 
process arising from between the lateral lobes of the 
ventral plate. It appears to belong to the same group 
as the Madeiran O. spinosella, McLach., but differs in 
the peculiarity of the ventral plate alluded to; the 
spines, too, are different, the innermost spine in O. spino- 
sella standing apart from the others, and being carried 
on an obtuse process. The penis in the two species is. 
on the same plan. 
Puate V., fig. 1, apex of abdomen in front; 2, ventral plate ; 
8, outline of apex of abdomen from side continued beneath, to 
show ventral lobe; 4, 5, 6 and 7, aspects of penis. 
Oxyethira Frict, Klap.—This species was also de- 
scribed in Sitz. Bohm. Ges., 1890. At one time I con- 
sidered the above-described British insect might belong 
to this species, but Professor Klapalek, who has kindly 
presented specimens of his species to me, points out the 
following differences :—The spines in the British insect 
are much stouter and shorter than in O. F'rici, in which 
there are on the left side 4, and on the right 8 spines. 
In O. Frict the penis is dilated quite symmetrically, but 
the teeth are a little asymmetrical, being nearer to the 
apex on the one side than on the other. The form of 
the ventral plate in O. Frici is also peculiar, and there 
is no process between its lateral lobes. 
A reproduction of Klapalek’s figures is here given. 
PuateE VI, fig. 1, apex of abdomen from beneath ; 2, same, from 
side ; 3, penis, from above. 
TRANS. ENT. SOC. LOND. 1893,—paRT I. (MARCH.) G 
