198 PYGIOPSYLLA ROBINSONI. 
the latter being stronger, alternating with shorter ones 
and the row itself a lateral continuation of the hindmost 
row of the first abdominal tergite. 
The second abdominal sternite with two short bristles 
near its anterior side under the free margin of the mete- 
pisternum, and with three bristles near the ventral side, 
of which two are very small and one short but strong. — 
Third sternite with 1, 1, 2 and 4 bristles. — Fourth sternite 
with 2, 3 and 4 bristles. — The fifth with 1, 3 and 4 brist- 
les. — The sixth with 2, 4 and 3 bristles. — The seventh with 
2, 3 and 3 bristles. — Highth sternite largely developed, 
rounded posteriorly, slightly concave ventrally, touching 
dorsally just its tergite; with about five irregular transverse 
rows of bristles (see the figure) (about 5, 6, 8, 8 and 5). 
On its ventral internal side this sternite is provided with 
a more or less rodlike appendage, which, like an antique 
club, bears numerous spines, two ventral ones of which 
are stronger. — The ninth sternite is in its anterior dorsal 
portion much wider than in C. ahalae. Posteriorly-ventrally 
it is provided with two short but stout bristles and seven 
smaller ones somewhat curved and hanging down. More- 
over it bears externally a small crest with five small bristles 
and internally four very short thick black spines directed 
backward. The penis or appendage of this sternite is only 
roughly sketched in my figure. One observes the posterior tubu- 
lar end of it and the pruning-knife-shaped anterior end. The 
posterior end is armed (on each side) with an almost qua- 
drangular chitinous organ, and a less chitinized piece like 
the beak of a parrot. — If we consider the tenth sternite 
as being divided into two pieces, viz. the subanal plate and 
the greater part of the clasping apparatus, I think we are 
near the truth. Then the „finger” is a modified ,,cercus” 
and identical with the female ,,cercus” (erroneously sometimes 
called ,stylus’’). The subanal plate only bears an apical 
strong bristle. The manubrium of the clasping apparatus 
is more or less pruning-knife-shaped; its dorsal prolonga- 
tion more or less rasor-shaped, and the ,,clasper’’ itself 
Notes from the Leyden Museum, Vol. XXXI. 
