r 
51 - Messrs. T. and A. Scott on some 
discovered in Germany some years ago by - Dr. Poppe, but 
which has not hitherto been known to occur in the British seas. 
Leptopsyllus intermedius, sp. nov. (Pl. V. figs. 1-11.) 
Description of the Spectes—Female. Length ‘58 millim. 
(#5 of an inch). Body elongate, slender. Anterior antenne 
eight-jointed, short, moderately stout; the first five joints 
gradually decrease in length, the fifth and sixth are equal; 
the seventh is shorter than any of the others, while the last 
is equal to the combined lengths of the two joints immediately 
preceding. ‘The antennz are provided with numerous mode- 
rately long sete, and a stout filament springs from the upper 
distal edge of the fourth joint. ‘The subjoined formula shows 
the number and proportional lengths of the joints— 
Proportional lengths of the joints ., 22-18.10.9.6.6.4.10 
WNumiber of the joimts © ~. 0052s scan i 2S. 2 eee 
Postericr antennz and mouth-organs somewhat similar to 
those of Leptopsyllus Robertsoni, T. and A. Scott, but smaller ; 
the end joint of the distal branch of the mandible-palp is also 
proportionally shorter (fig. 4). The outer and inner branches 
of the first pair of swimming-feet, which are both two-jointed, 
are nearly of equal length (fig. 5). The second and third 
pairs resemble those of Leptopsyllus Robertsoni (fig. 6). In 
the fourth pair the outer branches are two- and the inner 
branches one-, or indistinctly two-jointed (fig. 7). The basal 
joints of the fifth pair are coalescent and form together a 
broad lamelliform plate, subtriangular in outline; the margin 
on each side from the apex to the secondary joint is slightly 
convex, and immediately behind the secondary joints the 
margins are produced into broad and somewhat rounded 
lobes, each lobe being furnished with a moderately stout seta ; 
the secondary joints are very small (fig. 8). Caudal stylets 
fully twice the length of the last abdominal segment and 
equal in breadth to nearly half the length; they are each 
furnished with a terminal spine nearly as long as the stylet 
(fig. 10). One ovisac containing a few large ova. 
Male. The male is similar to the female, except that the 
anterior antenne are modified and hinged for grasping, and 
resemble in structure those of Leptopsyllus Robertsont. The 
basal joints of the fifth pair of thoracic feet, which are also 
coalescent, are considerably shorter than those of the female, 
and terminate in two broadly convex lobes, one on each side 
of the median line; each lobe is fringed with minute hairs ; 
the secondary branches are very small (fig. 9) 
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