Daerrnter, 1871.] 145 
PLECTROCNEMIA GENICULATA, Nov. Sp. 
3g. From the middle of the margin of the last dorsal segment proceeds an elongate 
lobe, truncate at the apex, depressed and concave above (this lobe 
is probably in reality the upper penis-cover). Append. super. 
almost as in conspersa, but more rounded. App. intermed. spini- 
form, long and curved, proceeding from either side of the base of 
the dorsal lobe. App. infer. very broad at the base, occupying the 
whole of the margin of the last ventral segment, and so close to- 
gether as to leave a scarcely perceptible space between them ; 
externally each is extended into a very long, slender, sub-cylindrical process, 
which is strongly geniculate in the middle (appearing to be two-jointed), 
the apical half strongly directed inwards, so that the tips of the opposite pro- 
cesses nearly meet, the apex flattened and somewhat dilated. 
9. Unknown to me. . 
I fail to find any characters in markings, &c., whereby to separate 
this species from P. conspersa, nothwithstanding that the appendices 
are so totally different in structure. But no doubt a series of fresh in- 
dividuals ef both species would present some slight external differences. 
I have a British example of this, of which I do not know the exact 
locality ; and another from Sedrun, in Switzerland, taken by Mr. 
Stainton, at the end of July. Two other British examples are in 
Stephens’ collection, as noticed above. 
PLECTROCNEMIA BREVIS, Nov. sp. 
6. From the middle of the margin of the last dorsal segment proceeds a short, 
broadly triangular process ; from beneath proceeds a very large, 
testaceous, shining, upper penis-cover, strongly curved downwards, 
and dilated towards the apex; the apical half of this cover is either 
double, or else it is very deeply canaliculate above. Append. super. 
very short, broader than long, the margin excised. App. intermed. 
short, ovate, appearing to proceed from beyond the excision of the 
app. sup., and to be placed almost under the penis-cover. App. 
infer. formed somewhat like those of P. conspersa, but half the length, only 
slightly acuminate and scarcely acute ; the upper penis-cover (in dead indi- 
viduals) is often curved down between these app. inf. 
9. Unknown to me. ; 
When compared with the two foregoing species this seems to be 
slightly smaller ; the dark streaks of the anterior wings are less evident, 
and the wings are closely sprinkled with small, rounded, golden spots, 
such as are usual in species of Polycentropus. In the neuration the 
first apical fork in the anterior wings is evidently, if only slightly, 
shorter than in the other species. 
I have five males taken by Mr. Stainton at Sedrun, in Switzerland, 
at the end_of July. 
