30 Trans. Acad. Sci. of St. Louis. 



not take place until the aiterooon of the day following, 

 and they severed early in the evening. Aug. 18 and 19 

 they were observed frequently, but no activities occurred 

 during these two days; it was not until noon, Aug. 20, 

 that the pair again mated. 



Aug. 21, 7 :00 A. M., the pair found separated ; 2 P. M., 

 male mounted on female ; an additional male introduced. 



Aug. 22, 7 A. M., all found separated ; 7 :30, one of the 

 males had mounted. Aug. 23, 6 A. M., all separated. 

 Aug. 24, one male mounted. Aug. 25, 6 :30 A. M., female 

 again in copulo with one of the males ; 4 P. M., severed, 

 but retaining position of mounting. Aug. 26, 6 :30 A. M., 

 this pair had resumed mating; 3 P. M., severed. Aug. 

 27, 7 A. M., found first egg-case which had been deposited 

 during the night. 



Thus this female mated six different times and re- 

 mained so about forty-five hours and deposited one egg- 

 case during the first 14 days of its adult life. 



The pair remained separated all day (Aug. 27) until 

 9 :30 P. M., when they were again found in copulo, after 

 a lapse of less than twenty-four hours since the deposi- 

 tion of the egg-case. No observations could be made the 

 next day, but on Aug. 29, 6 P. M., this female was again 

 mounted by one of the males, which condition continued 

 until the evening of Aug. 31. Thus for three days she 

 carried him without actual mating. Why this conduct 

 unless another egg-case was soon to be deposited! Was 

 the male inefficient, and if so, why was he not devoured? 

 Was the female still exhausted from egg-laying five days 

 before? At this time this male was removed and an- 

 other which appeared to be as yet unmated was placed 

 in the cage. Only five hours later, this pair was found 

 to be in actual copulo ; this indicates that probably the 

 other male was exhausted. During the following fore- 

 noon, Sept. 1, they separated. On Sept. 2, 6 A. M., the 

 lifeless remains of the male were found, with the 

 abdomen entirely eaten away. Why did the female carry 



