STRUCTURE AND ECONOMY OF SPIDERS. - 309 
the same month, it moulted again on the 17th of 
August, the 4th of September, and the 26th of 
September in the same year, and on the 26th of 
January, the 9th of April, the 24th of May, the 
21st of June, and the 5th of August in 1843, when 
it arrived at maturity, having changed its integument 
nine times. 
A male Zegenaria civilis, extricated from the egg 
on the 27th of June, 1542, also moulted nine times, 
casting its skin in the cocoon on the 10th of the 
following July; on the 21st of the same month it 
abandoned the cocoon, moulting again: on the 18th 
of August, the 10th of September, and the 13th of 
October in the same year, and on the Ist of 
February, the 25th of April, the 17th of June, the 
13th of July, and the 17th of October in 1843, when 
its development was complete. 
Modifications of food and temperature exercise a 
decided influence upon the moulting of spiders. A 
young female Zegenaria civilis disengaged from the 
egg on the 24th of July, 1842, on the 2nd of the 
following August moulted in the cocoon, which it 
quitted on the 12th of the same month, casting its 
skin again on the 29th of August and the 10th of 
October in the same year; being scantily supplied 
with nutriment, it increased very little in size, and 
died on the 4th of July, 18438, having changed its 
integument three times only. Another female of the 
same species, which was extricated from the egg on 
