312 NORMAN E. M INDOO. 



cocoon from the rock one must use precaution for fear the eggs 

 fall through the covering. 



In number the eggs vary from two to eight with five for an 

 average cocoon. They are transparent whitish in color and 

 are perfect spheres with an average diameter of 0.6 mm. During 

 the embryological stages, they soon take on a yellowish color, 

 become oblong in shape, and the outline of the embryos is dis- 

 cernible through the covering. Some of these embryos assume 

 the shape of the profile of a man's head. 



YOUNG. 



When hatched they remain for an indefinite period inside the 

 cocoon and when strong enough emerge through a small circular 

 hole. 



March 22, three of the seven eggs in a cocoon collected March 2, 

 hatched; April 3, two of these spiderlings were dead, they with 

 the remaining eggs were covered with mold. June 4, two of the 

 four eggs in a cocoon collected May 24, were hatched, one spider- 

 ling was dead and the other alive on this date. Neither one had 

 any eyes. July 29, a cocoon collected July 19, was examined and 

 contained three young. Each one was examined both alive 

 and dead. All eyes, except the anterior middle ones, were dis- 

 cernible. Female no. 139 made a cocoon and laid four eggs 

 May 5. On May 23 all four eggs were hatched, but the young 

 were still inside the cocoon. Each spiderling had all eight eyes 

 except the anterior middle ones. The eyes had a uniform diam- 

 eter of 0.018 mm. While alive under the microscope their little 

 eyes shone like small electric lights. Their mother had no signs 

 of external eyes. Many other newly hatched spiderlings were 

 observed both alive and dead. The anterior middle eyes are 

 never discernible. In some, the other six eyes are present and 

 in others no eyes can be seen. All the other eggs laid in the 

 laboratory failed to hatch. Perhaps this was due to uneven 

 temperature. 



The young are much thicker-set than the old. The legs are 

 thick and stubby. The cephalothorax and legs are transparent 

 whitish while the abdomen is light cream in color. The latter 

 has a few longitudinal rows of hairs. The length varies from 

 0.6 to 0.8 mm. 



