389 
fourth joint as long as the two distal joints together and conside- 
rably longer than the other. The upper branch is three and a 
half times longer tlian broad, as long as the fourth joint and one 
half of the third joint; the fiagellum is about three and a half 
times longer than the branch and somewhat shorter than the breadth 
of the head. The lower branch is only a little shorter than the 
upper, nearly three* times longer than broad, widening somewhat 
fioin the base outwards, and the anterior angle is deeply and obli- 
quelv cut off. The posterior fiagellum a little shorter than that of 
the upper branch and twice as long as the anterior fiagellum; all 
three fiagella are robust, and especially the two longest of them 
considerably thickened towards the end. The globulus is rather 
large, as broad as the upper branch; its stalk is short. 
lrunk (fig. 4 b). Moderately slender. — The fifth pair of 
tactile setæ is rather short, thin, with faint pubescence; the fourth 
pair is a little shorter than the fifth. The third pair is somewhat 
shortei than the fourth and shaped nearly as in P. danicus, but 
the setæ are thinner; almost from the base and about to the middle 
each seta increases considerably in thickness and from thence it 
tapers to the acute end; the pubescence is dense and rather short. 
— The posterior setæ on the penultimate segment and the setæ on 
the last segment are very short, cylindrical. 
Anal Segment (fig. 4 b and 4 c). The tergum overreaches the 
sternum posteriorly; it is produced in a rather broad and mode¬ 
rately low lamellar protuberance, the hind margin of which is re- 
gularly convex; the setæ are inserted at the margin; the submedian 
setæ are about one fifth as long as the breadth of the segment and 
si i gh tly longer than the distance between them, but shorter than 
their distance from the intermediate pair; the lateral setæ are 
nearly one half longer than the submedian pair which is slightly 
shorter than the intermediate ones. — The styli are not half as 
long as the submedian setæ, but somewhat thicker, cylindrical, se- 
tiform. — The sternum with the posterior setæ nearly four times 
longer than the submedian dorsal pair, considerably thicker, slightly 
