188 Proceedings of the Royal Physical Society. 
In PD. bifrons neither the external apical angle of the tibia nor the base of 
the tarsus is so produced. 
Only very minute differences are present in the palpal organs. 
D. elevatus has not previously occurred in Britain. It is rare in France, 
and occurs also in Belgium, Switzerland, Prussia, Holstein, Bavaria, Silesia, 
Galicia, Hungary, and Sweden. 
It is generally obtained from the lower branches of conifers, and, in France, 
is adult in May and June. 
Trochosa biunguiculata Camb. 
I found a single male on Cairntoul at 3100 feet. This species has 
occurred twice before in Britain, viz., a male at Braemar by Professor Trail, 
and a female on Cairntoul by Mr W. Evans. 
Continental writers have assumed that this is the Z. alpigena of Doleschal. 
I don’t know on what evidence this assumption is made, but I daresay our species 
is identical with that figured by Professor Kulezynski in Symb. ad fawnam 
Aran. Austriae inferioris, 1898, pp. 105 and 106, pl. 11., figs. 81 and 82. 
L. alpigena has occurred, according to these authors, in Greenland, Tyrol, 
and Switzerland. In the last country, according to Dr de Lessert, it has been 
taken at from 1000 to 2800 metres of altitude. 
A comparison of British with continental examples is necessary before 
any change of name is justifiable. 
DESCRIPTION OF A NEW SPIDER OF THE GENUS CLUBIONA. 
CLUBIONA HUMIDA sp. nov. 
[Plate V. Figs. 7, 8, 9, 10, 11] 
Size.—Total length between 5 and 6 mm., females rather larger than 
males. 
Colour rather variable. Cephalothorax yellow-brown above. <A 
short longitudinal black line usually marks the thoracic juncture, and 
this may or may not give out fine lines radiating to the borders of the 
carapace. Sternwin yellow-brown, rather darker at the edges. Abdomen 
yellow-brown, red-brown, or dark brown. A dark central dorsal 
longitudinal mark of a lanceolate shape is present, which does not extend 
far below the middle of the length and usually falls short of this. 
Numerous yellow-brown marks are sprinkled over the abdomen. On the 
