492 Prof. F. Klapalek’s descriptions 
In the ¢ the dorsal plate from side is elongate, slightly convex 
above at the base, with parallel upper and lower margins, 
the lower being obliquely arched upward at the apex. Superior 
appendages 22 as long as the dorsal plate, slender, slightly dilated 
towards the base, slightly curved downward and covered with 
blackish hairs. Intermediate appendages curved downward, 
bearing on the apex short thin spines and furnished on the 
underside before the apex with few slender long backward spines 
and with a feeble spine arising from the underside and curved 
downward, but with the apex again turned upward in form of the 
letter S. Inferior appendages two-jointed, 1st joint short, 
quadrangular, the 2nd much broader, elongately quadrangular, 
bearing on the middle of the apical edge a strong upwardly curved 
tooth. The exterior of these appendices, except the dorsal and 
apical margin of the second joint, is covered with black fine hairs, 
the apex of the second joint is furnished with dense straight strong 
sete, which almost conceal the apical tooth. Between the base 
of these appendages arises the shining, reddish-brown, spiniform 
penis, which is arcuate and with its apex turned downward 
between the appendices. The colour of all appendices in speci- 
mens preserved in alcohol is testaceous except the basal half of the 
inferior appendages, which is fuscous; in dry specimens the colour 
is fuscous, the apex of inferior appendages only being shining 
testaceous. 
? similar to that of J. dives, Pict. Exp. ¢ 9°5—11 mm.; 
Q 11—12 mm. 
This species, most resembling 7’. dives, Pict., is easily 
distinguishable by the uniform blackish wings, the 
slender superior appendages, the simple spiniform penis 
and the single tooth on the apical edge of the inferior 
appendages of the ¢. . 
frequents the rapid streams on the slopes of the 
Vitosa Mountain near Sophia, Bojana, 20th July. 
Rhyacophila obtusa, n. sp. 
Fuscous, head and pronotum clothed with golden yellow hairs. 
Antennw uniformly fuscous, with dense short pubescence. Palpi 
fuscous. In the legs the coxe are fuscous, the rest testaceous, 
tarsi fuscescent to the apex ; spurs brown and therefore very dis- 
tinct. Wings short and broad, anterior with an almost semi- 
circular apex. Membrane smoky-grey, uniformly densely covered 
with golden-brown pubescence, mingled only very sparingly with 
blackish hairs; on the posterior the pubescence is thinner and 
