ERE REE EEN, 
EPS oge SE" SÆSSSRERESE NEED EE e 
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 than broad, as long as the fourth joint! and :one 
half. of the third joint; the flagellum 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 
from the base outwards, and the anterior angle. is deeply and obli- 
quely. cut off. … The posterior flagellum a little shorter than that of 
the. upper branch and twice as long as the anterior flagellum; all 
three" flagella 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. 
Trunk (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 
shorter 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, thé 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 
slightly lønger 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, cylindrieal,: se- 
tiform. —. The sternum with the posterior setæ nearly four times 
longer than the submedian dorsal pair, considerably thicker, slightly 
