PYGIOPSYLLA ROBINSONI, 195 
NOTE XI. 
PYGIOPSYLLA ROBINSONI (ROTHSCHILD) & 
BY 
Dr, A. C. OUDEMANS. 
(With 1 text-figure). 
The female of this species has been described by the 
Hon. N. C. Rothschild in Novitates Zoologicae, Vol. 12, 
p. 483 (pl. XIII, fig. 6). The author states that it is allied to 
Ceratophyllus ahalae Rothsch., and indeed the head of the © 
of this species, judging from the figure given by the British 
Suctoriologist in Novit. Zool. Vol. 11, pl. XI, fig. 51, resem- 
bles that of the present species as two peas. The male appa- 
ratus, however, differs, though not widely. 
Head. The antennal groove, which is closed behind, 
reaches far dorsally, so that it is very near the vertex. The 
grooves are united by a very fine but distinct seam. In 
the anterior part of the head there are three eyelike organs, 
two near the fore margin, one above the implantation of 
the maxillary palp and behind the foremost row of bristles. 
In the posterior part of the head there are also three 
eyelike organs, two near the dorsal margin, and one above 
the middle of the antennal club and behind the foremost 
row of bristles. The foremost -portion of the anterior part 
and that of the posterior part of the head are finely punctured 
i.e. provided with numerous extremely fine and minute hairs. 
Then follows in the anterior part an oblique row of six 
heavy bristles, behind which one observes a second row of 
four ditto; then between this row and the eye, eight heavy 
bristles irregularly placed. The eye itself is ellipsoidal ; 
its fore half is brown, its hind half black; its fore half 
Notes from the Leyden Museum, Vol. XXXI. 
