Oonops pulcher. 405 
tibia and 1st of the tarsus with a double row of strong and lengthy spines ; 
the posterior legs with a few additional, smaller, irregularly placed. 
This beautiful little Spider, which is with me exceedingly common, is 
to be found in the same situations as the last: it passes the winter in the 
centre of little cocoons which it weaves in the interstices of the ivy. 
When first detached from the cocoons they are a little stupid, but soon 
recover and begin to run about. They seem in their movements to com- 
bine the peculiarities of different families of Spiders, at one time run- 
ning forwards, then, when interrupted in their progress, taking a little 
jump to the right or left with inconceivable swiftness and starting off in 
some other direction. Ihave never seen them catching their prey by 
leaping on it, but have no doubt of their capability, if the destined fly be 
properly situated to admit of it, and Iam inclined to think that this is 
their mode of seizure, as they do not seem inclined to weave nets; a few 
irregular threads being the only product of their labour when I have ccn- 
fined them. 
They seem to possess a power which, from Mr. Blackwall’s obser- 
vations, must be very rare among Spiders; I allude to their being 
enabled to walk upon glass. I have taken every precaution in ascer- 
taining this, so as to avoid every doubt which could arise. I took them 
up on the point ofa brush and placed them on a plate of glass and then 
set them off running in an opposite direction to that by which I placed 
them there, so that no previously formed thread could assist them. I 
also applied a high magnifier, and though the glass plate was held 
towards opaque and luminous objects and with the light falling in every 
possible direction, I could detect no thread; 1 observed however that the 
whole of the last joint of the tarsus was closely adpressed to the glass, 
and that it walked with great deliberation ; when disturbed immediately 
forming a thread asit dropped. How they manage this I cannot say, as 
they have no provision such as we find on the feet of flies to enable them 
to effect it. The claws are figured in the drawing, and between them I 
detected on one foot a little transparent body on a peduncle exactly like 
what we observe on the feet of the genus Ciro. Perhaps this may be 
the part of the foot in which the power resides, It requires future 
investigation, 
