324 KATHARINE FOOT AND E. C. STROBELL. 



Plains, N. Y., April 16, 1911, by Mr. de la Torre Bueno. These 

 bugs were placed in a cage in our laboratory and, four days later, 

 one pair mated, and while mating were transferred to a separate 

 cage, in which they were kept during the entire breeding season, 

 until the female died. 1 



Three of the female offspring of this pair were used for the 

 cross-breeding experiments with ictericus. They reached the 

 winged stage on the following dates: July 3, one female reared 

 from the group of 4 eggs deposited May 22; July 15, two 

 females reared from the group of 29 eggs deposited June 9. 

 The three male ictericus that were caged with these three vario- 

 larius females, were reared from eggs deposited in our laboratory 

 May 22 and June 2. These eggs were deposited in a cage con- 

 taining ten E. ictericus specimens that had been collected a few 

 days before by Dr. Knab in a swamp near Washington, D. C. 

 One of the males from these eggs reached the w r inged stage July 

 7 and two, July 15 and the three were caged with the three above- 

 mentioned variolarius females. 



August 12 a pair of these bugs mated and while mating were 

 transferred to a separate cage (cage 5). The record of this pair 

 shows that they mated 6| hours 2 and did not mate again while 

 they were under observation (from August 12 to November 

 24, 1911) when the female died. On August 15, 7 eggs were 

 deposited, none of which developed. On August 18, 4 eggs 

 were deposited one of which hatched and was raised to maturity 

 this being the FI female which we mated the following spring 

 to a pure ictericus male. On August 25, 23 eggs were deposited, 

 none of which developed. (See photo 63 for the male of this 

 pair.) 



A second pair mated August 19 and this pair also was isolated 

 (cage 13). A group of 8 eggs was deposited by this second pair 

 August 22 and a group of 18 eggs on August 25 but none of these 

 26 eggs developed. 



1 The record of the breeding period of this pair of variolarius was published in 

 our report of the results of crossing E. variolarius X E. servus. This record is 

 entered as "cage 2, 1911." Foot and Strobell, '14, Journ. Linn. Soc. London, 

 Zool., Vol. XXXII, p. 362. 



2 The length of time for each mating can be given only approximately as obser- 

 vations were made not oftener that three or four times each hour, during the day 

 and three or four times during the night. 



