395 
mens; the anal plate is elongated, abont twice as long as broad, 
and much longer than the branches which are proportionately short; 
the lateral pair of dorsal setæ on the anal segment are scarcely 
longer than the submedian pair. Nevertheless, I have considered 
this specimen as a small variety of P. vulgaris. 
Locality. Den mark, in woods in various localities. I have 
captured numerous specimens in „Dyrehaven 14 near Copenhagen in 
June and July 1891 and in July 1901, a few specimens at Ledre- 
borg, July 31. 1891, and the small specimen mentioned in „Store 
Klinteskov 44 in the Island of Møen, July 1892. Mv specimens were 
found under rottening leaves, rotten timber or stones in damp pla- 
ces. Dr. Th. Mortensen has captured several specimens at Hellebæk 
near Elsinore under bark of old stubs. — It is, in all probability, 
the commonest species in Denmark, but I have not seen any spe¬ 
cimen from other countries. 
Remarks. This species is easily distinguished from all other 
forms known to me by the shape of the anal plate witli its two 
pairs of branches, one pair of which above the other; the shape of 
the third pair of tactile setæ with their rather long vertical pubes- 
cence on the thin distal third olfers also a good character. 
17. P aur opus gracilis n sp. 
PI. Y, tig. 3 a—8 f. 
Material. When the figures were drawn I possessed a single 
rather well preserved specimen, an adult male, from Italy. Later 
on I found a fragment between animals from Denmark, and from 
two other sources I received some specimens, adults and young ones, 
but all were badly preserved. The description has been based on 
the Italian specimen and the differences mentioned under „variation 44 . 
Head (fig. 3 a). The eyes are broad but not as long as in 
P. vulgaris ; the distance between them being only a little shorter 
than their length. — The hairs almost as in P. vulgaris, the outer 
pair in the second row a little longer than in that species, the 
