Rey. O. P. Cambridge on British Spiders. 121 
mature) were found, in their orbicular snares, at Lulworth, in 
June 1877. Ihave met with it also in various other localities ; 
and probably it would be found sparingly in most of the wild 
heathy districts of the south of England. 
Epetra diademata, Clerck. 
It would be interesting to ascertain exactly at what period 
the young of this common spider begin to construct the 
orbicular snare characteristic of the family to which it be- 
longs. On the 18th of May I found a brood of young 
which had effected their first change of integument; but they 
were still living in a certain sort of community, and spinning 
only irregular lines fixed in various directions to the sur- 
rounding plants. 
Genus CyrToPpHora, Sim. 
Cyrtophora conica. 
Sd i Walck., Blackw. Spid. Great Brit. & Irel. p. 362, pl. xxvii. 
On the 30th of May 1876 I discovered a very beautiful and 
perfect web of this spider, spun between the leaves of a pear- 
tree, the adult female occupying,as usual, the centre of the snare. 
Observing an unusual appearance in the web near her, I 
found on a close examination that a space above an inch in 
length, both above and below the centre of the snare, and en- 
closed between two adjoining radii, was warped across andacross 
and wound about with white flocculus of an adhesive nature, 
very similar to that found on the linesof the snareof Amaurobius 
ferox, C. Koch. Ona very slight movement of the web the 
spider raised itself upon the extremities of its tarsi, and by 
means of a strong muscular movement, aided no doubt by its 
own weight, imparted to itself a rapid vibratory motion for 
half a minute or more, repeating it on each disturbance of the 
web. I have noticed similar vibrations in some other Epeirids 
and also in Pholcus phalangioides. The vibration is proba-~ 
bly intended to shake any insect entangled slightly in the 
outskirts of the snare still further into it; and the adhesive 
flocculus is doubtless to aid in the entanglement when the final 
struggle comes. 
Genus Xysticus, C. Koch. 
Xysticus versutus. 
Thomisus versutus, Blackw. Spid. Gr. Brit. & Irel. p. 88, pl. 1v. fig. 49. 
Thomisus pallidus, Bl. 1. c. p. 82, pl. iv. fig. 48. 
Xysticus horticola, C. Koch, Die Arachn. iv. p. 74, tab. 129. figs. 296- 
298. ; 
After a very careful examination of the types of this spider 
Ann. & Mag. N. Hist. Ser. 5. Vol. i. 9 
