372 
Head (fig. 2a). It bears considerable resemblance to the head 
of P. robustus. The eyes are rather small, not quite twice as long 
as broad; the distance between them. is one third longer than the 
length of an eye. — The hairs in the two anterior rows and the 
submedian pair in the fourth row are moderately long, in the third 
row comparatively short, and all these hairs are rather strongly 
clavate; the intermediate hairs in the fourth row are somewhat cla- 
vate and a little shorter than the eyes, while the sublateral hairs 
are slightly clavate and about two thirds as long as the inter- 
mediate pair. 
Antennæ (fig. 2a). The upper one of the front hairs on the 
fourth joint of the pedunele is as long as the three distal joints 
together and nearly twice as long as the other hair. The upper 
branch is as long as the peduncle, about six times longer than 
broad; its flagellum is a little more than twice as long as the 
branch and a little shorter than the breadth of the head. The 
lower branch is about two thirds as long as the upper, two and åa 
half times longer than broad, slightly widening distally; the an- 
terior angle is very deeply and obliquely cut off; the posterior fla- 
gellum is a little shorter than that on the upper branch and slightly 
more than twice as long as the anterior flagellum. All three fla- 
gella are slender, the two longest of them slightly thickened near 
the end. The globulus is moderately small, not as broad as the 
upper branch; the stalk is rudimentary. 
Trunk (fig. 2b).  Moderately slender. — The fifth pair of 
tactile setæ is somewhat more than twice as long as the breadth 
of the segment, rather robust and delicately pubescent. The fourth 
pair slightly more than two thirds as long as the fifth and some- 
what thinner. The third pair is slightly more than half as long 
as the fifth, slightly thicker and more pubescent than the fourth, 
almost thickened from the base to the middle and tapering distally. 
— The posterior dorsal setæ 'on the penultimate segment are rather 
long, cylindrical; the setæ on the last segment are rather long, 
