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sensorial filaments; in the specimens from northern localities, Spitzbergen, Greenland, etc.
one of these distal sensorial filaments was somewhat displaced proximallv. The d-, e- and
g-bristles are subequal, about as long as the total length of the three distal joints. The
last-mentioned one has three proximal and four distal sensorial filaments, thus the same nurnber
as in the female. The c- and f-bristles are subequal or else the latter is somewhat shorter than
the former; on ail the specimens investigated the c-bristle had thirteen, the f-bristle twelve
sensorial filaments, distributed fairly uniformly along the whole length of the bristle. The
hairs on this limb are somewhat more weakly developed than in the female.
Second antenna: — Exopodite (fig. 10): This has about the following
proportions between its joints:
1 : II : III : IV : Y : VI : VII : VIII : IX - 15 : 6 : 9 : 2 : 2 : 2 : 1.5 : 1 : 0,5,
i. e. the first joint is about as long as the total length of the second and third joints and the
third joint is about as long as the total length of ail the following joints. The bristle on the
second joint is furnished ventrally at about the middle or somewhat proximallv to this point
with about four to six rather strong, smooth spines. The natatory hairs on the natatorv bristles
are perhaps somewhat wider than in the female. The end joint lias only six bristles, one of the
shorter ones of the female being missing; either both the two short bristles on this joint are
provided with long natatory hairs or else the shorter one of them has short hairs. End
o-p odite (fig. 11): The first joint has quite the same equipment of bristles as in the female.
The second and the third joints are long and of about the same length. The former has ventrallv
at the middle three moderately long, subequal bristles with short hairs. The latter is rather
strongly bent; its concave side, which is turned towards the second joint, is somewhat undulated
and has about five or six weak transverse chitinous ridges distally and no deep notch proximallv;
its proximal bristle is rather short, about a quarter or a third of the length of the joint, and
rounded distally; its two distal bristles are subequal, about as long as the distal breadth
of the joint.
Mandible: — Protopo dite: The endite of the coxale is sometimes of about
the type shown in the figure 13, sometimes it is of about the same type as in the female,
only considerably smaller. The two main points are sometimes of about equal length, sometimes
one is rather considerably longer than the other; the latter seems to be most often the case;
the chitinization is weak, the bristle situated laterally at the base is similar to that in the female;
there is most often scarcely any armature. Basale: The six proximal-medial bristles are of
about the same length as in the female, all rather weak and finely pectinated; most of them are
without any long secondary bristles; only the distal one often has a wreath of them at the
middle. This joint has six or seven bristles ventrally, of the same length as in the female; the
proximal ones have considerably more abundant long secondary bristles; these secondary bristles
are, however, less stiff. Of the four dorsal bristles on this joint the long distal bristle is about
the sanie as in the female, the tliree others are in most cases relatively shorter and have no
long secondary bristles. The two bristles of the exopodite are in most cases without anv
long secondary bristles; sometimes, however, one or even both may have a wreath of these bristles
50
Zoolog, bidrag, Uppsala. Suppl.-Bd. I.
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