'26 THE ENTOMOLOGIST. 



the antenna bears six long bristles, while in the ' Horae ' the six 

 bristles placed before the eye are noted as a character. In the 

 s}'ecimens 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 Ni/cteridopsi/lla 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, 

 <?), 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 Zoologise Labo- 

 ratorium at Budapest, taken off Plecotus anritus 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. 398 (1908, Konigsberg) ; id., I. c. vol. il. p. 45, 



fig. 3 (1908). 

 The head (PL I. fig. 2, S ) 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 PL 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- 



