26 THE ENTOMOLOGIST. 
the antenna bears six long bristles, while in the ‘ Hore’ the six 
bristles placed before the eye are noted as a character. In the 
specimens kindly forwarded to us by Dr. Oudemans there are five 
or six long bristles on the second segment of the antenna, while 
in the other two species of Nycteridopsylla there are only one to 
three of these long bristles. The second character, again, applies 
only to this species. We therefore concur with Dr. Oudemans in 
identifying this insect with N. pentactenus of Kolenati. 
N. pentactenus is easily recognized by the head (PI. I. fig. 1, 
3), the long bristles of the body, and the modified segments. 
The metathoracical sternite bears near the posterior edge a 
bristle which nearly reaches to the hind edge of the epimerum. 
The dorsal bristles of the thorax and abdomen are rather shorter 
than the lateral ones, while in the males of eusarca and longiceps 
the dorsal ones are prolonged. Dampf has given a fairly correct 
figure of the clasper of the male. The ninth sternite resembles 
that of longiceps (cf. Entom. 1908, Pl. VIII.), but the distal 
portion is more curved upwards, somewhat resembling the 
runners of a sleigh. The seventh abdominal sternite of the 
female is represented on our Plate (fig. 5). This sternite differs 
very essentially from that of the allied species. It has one 
sinus on each side, the lobe above the sinus being very broad 
and strongly rounded, while the lower lobe is narrow. 
Dr. Oudemans obtained this species off Vesperugo serotinus at 
Arnheim, in Holland. There are no examples of it among those 
of Kolenati’s specimens preserved in the Museum at Vienna, nor 
have we seen it from any other collection, with the exception of 
a single male example received from the Hazai Zoologiz Labo- 
ratorium at Budapest, taken off Plecotus auritus. in Hungary on 
December 15th, 1908. The species, however, may be expected 
to occur in Great Britain. 
2. Nycteridopsylla eusarca, Dampf. 
Nycteridopsylla eusarca, Dampf, Schrift. Phys.-okon. Ges. 
vol. xlviii. p. 898 (1908, Konigsberg) ; id., 1. c. vol. il. p. 45, 
fig. 3 (1908). 
The head (Pl. I. fig. 2, 3) bears only two long bristles on the 
frontal portion, and the club of the antenna is longer than in 
pentactenus. The dorsal bristles of the thorax and abdomen are 
prolonged in the male. The modified segments of both sexes 
are quite different from those of pentactenus. The non-movable 
process of the clasper of the male is short and broad, the apex 
being rounded, except on the distal side. The finger is much 
broader than in pectactenus, being widest above the centre. The 
seventh abdominal sternite of the female has a double sinus on 
each side as shown in PI. I. fig. 4. The lobes of this sternite do 
not actually lie in one plane, as represented in the figure ; the 
sinus therefore does not appear so large in an unmounted speci- 
