391 
pair rather long; in the fourth row the submedian pair is rather 
shoit, the intermediate setæ about three lifths as long as the eves 
and a little longer than the sublateral pair. 
Antennæ (fig. 5 a). The upper one of the front hairs on the 
fouith joint as long as the three distal joints together and con- 
sideiabh longer than the other; both are sharply ringed. The 
nppei bianch is four times longer than broad and as long as the 
three distal joints of the peduncle; the flagellum is nearly three times 
longer than the branch and considerably shorter than the breadth 
of the head. The lower branch is somewhat shorter than the upper, 
a little more tlian twice as long as broad, strongly widening from 
the base outward; the anterior angle is very deeply and obliquely 
cut o ff. The posterior flagellum is slightly shorter than that of 
the upper branch; the anterior flagellum is about four fifths as long 
as the posterior one. All three flagella are robust and somewhat 
thickened towards the end. The globulus is rather large, as broad 
as the upper branch; its stalk is slightly longer than thick. 
Trunk (fig. 5 b). Moderately siender. — The last (fourth) 
pair of tactile setæ is short, thin, faintly pubescent; the third pair 
is a little shorter, thickened at the middle and pubescent as in 
P. pectinatus. — The eight setæ on the last segment are cylin- 
drical, some of them short, the others very short. 
Anal Segment (fig. 5 b, 5 c and 5 e). The tergum overreaches 
the sternum posteriorly; as usual in immature specimens it has 
four pairs of setæ; the three normal pairs are inserted close to the 
posterior margin (and some of them even on the ventral side of 
the segment). The submedian setæ are short, slightly one fifth as 
long as the breadth of the segment; the distance between them is 
a little shorter than their length and somewhat shorter than their 
distance from the intermediate setæ, which are a little shorter than 
the submedian pair; the lateral pair is about one lialf longer than 
the submedian and more than twice as long as the supplementary 
pair. — The styli are nearly half as long as the submedian setæ, 
considerably thicker, cylindrical. — The sternum with the posterior 
