148 



The University Science Bulletin. 



In the table X signifie.s observed mating, 

 plus sign indicates that the bags were mating 



If followed by the figure 2 it 

 when first or last observed, or 



indicates two separate matings. The 

 both. 



The above table indicates that the mating clasp may last as long 

 as seven hours, that matings are frequent, often twice a day, and 

 that they occur almost daily over a considerable period of time. 

 Matings were observed in the laboratory from May to November. 



OVIPOSITION. 



The eggs are either completely or partly buried in the sand, ceph- 

 alic end uppermost. The partly buried dry egg is white and very 

 difficult to discover in dry sand. When it is moistened it changes to 

 an amber or ferruginous, and with the sand takes on a deeper colored 

 and glistening appearance, which further adds to its resemblance to 

 a sand grain. A photograph of the egg upon a background of sand 

 is shown on plate XIII. The number of eggs deposited by a female 

 during the season must be 200 or more, because 192 nymphs and eggs 

 have been recorded for one female, and it is quite likely that I did 



