381 
than the inner; the intermediate setæ in the fourth row are scarcely 
half as long as the eyes and not longer than the sublateral hairs. 
Antennæ (fig. 2a). The front hairs on the fourth segment 
are short, the upper one not longer than its joint and longer than 
the other. The upper branch is (in this immature specimen) mo- 
derately short, not three times longer than broad; its flagellum is 
a little more than three times longer than the branch, rather robust 
and considerably thickened towards the end. The lower branch is 
more than three fourths as long as the upper one and somewhat 
less than twice as long as broad, strongly widening from the base 
to the anterior flagellum; its anterior angle is very deeply and 
obliquely cut off; the posterior flagellum is only a little shorter 
than that of the upper branch and similar in shape; it is more 
than two and a half times longer than the anterior flagellum. The 
globulus is exceedingly small; its stalk is short. 
Trunk (fig. 2 b). Elongate and slender. — The last (fourth) 
pair of tactile setæ is rather short, rather thin, and the pubescence 
on the distal half is conspicuous. The penultimate pair is cylin- 
drical in the proximal and tapering in the distal half; the pubes- 
cence is proportionately long and distally nearly vertical. — The 
eight setæ on the last segment are moderately short, the outer 
pair in the posterior row even short; all are cylindrical. 
"Anal Segment (fig. 2b and 2c). The tergum is posteriorly 
cut off; "its three usual pairs of setæ are arranged about as in P. 
danicus, and an accessory pair is (as usual in specimens with eight 
pairs ”of legs) inserted at the middle of the lateral margin. The 
submedian setæ are long, a little longer than one third of the 
breadth of the segment, and the distance between them is quite as 
long; the setæ of the intermediate pair are a little longer, and the 
lateral setæ are twice as long as the submedian pair. — The styli 
are exceedingly short and thin. — The sternum with the posterior 
setæ a little shorter than the submedian dorsal pair, and nearly 
twice as long as the lateral pair; the anterior setæ are very short, 
inserted slightly in front of the lateral pair, but a little nearer to 
