ANNALS OF SCOTTISH NATURAL HISTORY 32 
Posterior antennz and mouth organs similar to those of 
Leptopsyllus robertsont. The first pair of swimming feet are also 
similar in structure to those of that species, but smaller, and 
the outer branches are considerably shorter in proportion to 
the inner branches (Fig. 17). Inner branches of the second 
and third pairs one-jointed and very rudimentary (Fig. 18). 
Fourth pair similar in structure to those of Leptopsyllus robert- 
sont, but considerably smaller. The fifth pair are also similar 
in structure to those of that species, but the coalescent basal 
joints are proportionally longer, being in length equal to 
about three-fourths of their entire width at the broadest part. 
They also differ in form, being subconical in outline and with 
the apex distinctly bifid. Each of the two apical angles bears 
two short sete, and the lateral basal lobes are each furnished 
with a moderately long hair. The secondary joints are very 
small (Fig. 20). The length of the caudal stylets is scarcely 
equal to the combined lengths of the last two abdominal 
segments, while their breadth is nearly equal to half the 
length. They are each furnished with a few setz, the principal 
terminal seta being about twice the length of the stylets ; 
while one of the others, which are very small, springs from 
near the middle of the outer margin (Fig. 22). The ovisac 
contains a few very large ova. | 
Male.—The male is very similar to the female, but the 
anterior antenne are modified for grasping, and resemble 
those of the male of Leptopsyllus robertsont. The fifth pair 
of thoracic feet, which are very small, also resemble those of 
that species; but the coalesced basal joints are shorter, and 
scarcely extend beyond the base of the secondary joints, 
while the secondary joints are proportionally larger. In the 
sixth pair of appendages the inner margins are sinuated and 
slope considerably outwards, the outer margins are short and 
nearly straight, and the broadly rounded apex is furnished 
with two small setae on the outer aspect and a small but 
stout spine interiorly (Fig. 21). 
ffabitat_—On the shore at Musselburgh, in the same pools 
with Leptopsyllus robertsont. 
Remarks.—This species is much smaller than the one 
last described, and is readily distinguished from it by the 
form of the caudal stylets, which are comparatively shorter 
