384 
what thickening from the base in about three fourths of the length 
and from thence tapering, but the apex is blunt; the pubescence is 
rather short but very conspicuous, and vertical on the distal part of 
the setæ. — The posterior setæ on the penultimate segment and 
the setæ on the last segment are sharply ringed and all very short, 
Avith the exception of the sublateral pair on the last segment, 
which is a good deal longer. 
Anal Segment (fig. 1 b). It looks very anomalous. The ter- 
gum is very short and posteriorly cut off; in all specimens seen by 
me it is considerably or even very much overreached posteriorly 
and — to a lesser degree — on the sides of the sternum, the po¬ 
sterior part of which is bent stronglv upwards, and the result is 
that not only the anal plate but the posterior pair of ventral setæ 
are situated dorsally and more or less in front of the hind margin 
of the segment. The tergum has in the adults three pairs (in the 
immature specimen as usual four pairs) of setæ which are verv 
curiously arranged; viz. in a short curved line near to each lateral 
margin. The distance between the three setæ on the same half is 
therefore very short; the seta of the submedian pair is placed a 
little longer from the lateral margin than that of the intermediate 
pair, which is inserted so closely in front of the lateral seta that it 
is easilv overlooked and sometimes even difficult to discover. The 
«/ 
setæ are all tapering, those of the submedian pair at most a little 
more than half as long as the breadth of the tergum and about 
four fifths as long as the lateral setæ which are three to four times 
longer than the intermediate ones. — The styli are cylindrical, seti- 
form, even nearly half as long as the lateral dorsal setæ. — The 
sternum has the posterior setæ inserted on broad protuberances, 
tliey are rather tapering and about one half longer than the sub¬ 
median dorsal setæ; the lateral setæ are about three times shorter 
than the posterior pair; the anterior pair is placed rather near the 
front margin of the segment, its setæ are about as distant from 
each other as those of the submedian dorsal pair and as long as 
the lateral ventral setæ. — The anal plate is unusually large, 
