358 
one half longer than thick and somewhat shorter than the tibia, 
which is two and a half times longer than thick; the tarsus is a 
little more than one half longer than the tibia. The hairs on coxa 
and trochanter are biramous; the seta on the tibia is only a little 
shorter than its joint. The leg is almost or quite naked. 
Copulatory Organs. Seen from in front the basal half looks 
cylindrical, the distal half very obliquely cut off on the interior 
side; the inner margin is straight, the outer convex; the apex 
is blunt. ; 
Length. A large and well-extended female from Denmark is 
1-56 mm., a smaller and contracted male only 8 mm. in length; 
an adult and somewhat contraeted male from Italy is 1-34 mm., 
in extended condition thus scarcely smaller than the large Danish 
female. 
Variation. My single specimen from Italy presents some lesser 
differences from the Danish ones. " The upper antennal branch is 
almost eight times (in Danish specimens five and a half to six 
times) longer than broad. The submedian pairs 'of setæ on the last 
segment of the trunk are cylindrical and only one fifth as long as 
the posterior breadth of the segment; in Danish specimens they 
are tapering and "one third of the breadth. On the anal segment 
(fig. 3f) the median protuberance on the tergum is longer than in 
Danish specimens and besides somewhat angular; on each side of 
the median protuberance is seen a smaller projeetion which in 
Danish specimens is very faint and situated just im front of the 
hind margin. The inner branclies of the anal plate (fig. 3 f) are 
longer, éspecially in the distal half more elongate and considerably 
narrower than in Danish specimens (fig. 34). In spite of these 
differences I had referred the specimen from Italy to P. Huæleyi, 
and two specimens captured at Marburg and received later on proved 
the correctness of the view. One of these German specimens is 
smaller than those from Denmark but otherwise completely agreeing 
with them,' while the other presents a curious combination of eha- 
acters: vin some features almost agreeing with a Danish, in other 
