132 Journal of Entomolog)' and Zoology 
"The young of Lycosa remain in the cocoon until the second moult, 
after which they emerge and clamber upon the mother's back 
where the third and fourth moults occur before the little fellows 
begin independent housekeeping in miniature burrows of their 
own." With the other species it was difficult to see how many 
moults occurretl before egress from the sac and no accurate data 
was found upon it. 
There was a great liifference bet\\-een the different families in 
the actual time of emerging. The Attidte, Lycosids, Theridiidas 
and Oxyopids seemed to pop right out of the sac like ripe peas out 
of a pod, while the Araneins took from one to two days or a few 
hours, all according to the heat and sunshine. Those egg sacs which 
were kept in a dark box were \"ery slow in emerging. One little 
one would force its way out of a corner of the cocoon, spin a line 
of web to the corner of the box and spend all the rest of the day 
running up and down that thread. The others might not appear for 
a day or two. If the box with its one little occupant was placed in 
the sunshine, inside of two hours every one of the spiderlings would 
be out spinning. Egg sacs which showed no signs of hatching 
were placed in the sunlight and within two hours one little one 
would be out and the rest soon followed. These experiments with 
the dark and light in reference to the length of time of emerging 
were only carried on successfully with those of the Araneina?. The 
other egg sacs were placed in simshine each day but it did not seem 
to force the young from the sac. The Attida? came out with the 
application of both heat and sunshine, but seemed to be prematurely 
"hatched," as they were inactive and soon died. Sunshine alone 
did not force them out, but the application of heat was sufficient, 
after a day's application. The natural time of emerging for the 
Attida? is in hot summer weather so this in a way explains why heat 
was so effecti\e. Heat or sunshine had no effect upon Lnlrodt'ctiis 
or Lvco.ui except just at the time of emerging. They could not be 
forced to emerge. A definite conclusion was reached, — that the 
young will wait for a sunny day to emerge. This seems to be true 
of all families. Not one was found which had emerged upon a 
cold, cloudy day. The house-raised spiders of all the groups 
studied emerged earlier than the ones out-of-doors in their natural 
