544 Proceedings of the Royal Physical Society. 
find a few adults running in the sunshine on the warm sand. 
All were males, however, and as the type of borealis is a 
female, the discovery of adult females of the Luffness spider 
was most important. A second search having produced only 
one or two more males, a third visit to the sandhills was 
made on 16th June, this time with complete success. At 
first only males (fully a dozen) were obtained, all running as 
before on the warm sand. The “marram” grass and thistle- 
heads were searched and swept in vain for the females, 
which in the end were found by the merest chance concealed 
in bits of dry seaweed (Fweus) and withered leaves lying on 
the sand. In these they had constructed their domiciles 
and placed their ege-cocoons, of which they make several, 
each containing about fifteen to twenty eggs (three opened 
contained sixteen, seventeen, and nineteen respectively; and 
one opened in the beginning of July contained newly hatched 
young). The discovery.of this habit at once revealed their 
presence in considerable numbers. After examining about 
a dozen of each sex, Mr Cambridge has come to the con- 
clusion that they belong to an undescribed species. “I 
would propose for it,” he writes, “the name Dictyna arenicola, 
nearly allied to, but, I think, quite distinct from D. borealis, 
Cambr., from North Greenland (Ann. and Mag. Nat. Hist., 
1877, p. 273).” This new form is described (and figured) by 
Mr Cambridge in an Appendix to the present paper (p. 589, 
PI XE). 
Amaurobius fenestralis, Str. 
Cinifio atrox, Bl. Spid. Great Brit. and Irel. 
Universally distributed and very common, from the Isle of 
May to the most inland localities, making its dens in holes 
in walls, crevices in rocks, under loose bark on old trees, in 
dense whin bushes, etc.; occasionally also in houses, where, 
however, it gives place to the next species. We have noted 
adults of both sexes in every season of the year, and very 
young examples in mid-winter as well as during summer. 
In August last, specimens of all ages (including adult males) 
were shaken out of the debris under whin bushes on the 
Braid Hills. 
