344 MISSES K, FOOT AND B. C, STROBELL : RESULTS OF 



that mating occurs dnriug the breeding season at rather definite intervals in 

 relation to the deposition of eggSj as a rale eggs being deposited only once or 

 twice between two matings. These records show further that nearly all the 

 eggs deposited during the height of the breeding season develop and hatch. 

 The features in which the breeding habits of the crosses differ from the 

 normal can be best appreciated by comparing the following brief summary of 

 the results from the eleven records given on pp. 362-70. 



Record I. (p. 362). E. vanolar'ms (one pair). — 210 eggs were deposited 

 from Mav 22nd to August 25th. The pair mated 13 times, and eggs were 

 deposited 9 times, but not oftener than once or twice between two matings. 

 None of the eggs deposited after July 25th were kept. Of the 129 eggs 

 deposited before that date all hatched except seven, which were undoubtedly 

 injured by the male, for he was discovered sucking them almost immediately 

 after they had been deposited. He had taken the entire contents from two 

 of these eggs, leaving nothing but the transparent shells. 



Record II. (p. 363). E. vanolarius (one })air), — 78 eggs were deposited 

 between July 2nd and July 26th. The pair mated 12 times, and eggs were 

 deposited 6 tunes, — in one instnnce being deposited 3 times between two 

 matings. None of the eggs deposited after July 10th were kept. Of the 63 

 deposited before that date all hatched but three. This pair was killed 

 July 26th. 



The two records (I. & II.) show what we believe to be the normal breeding 

 habit of both E. variolarius and E. servus. They show that nearly all eggs 

 develop that are deposited during the height of the breeding season, and 

 that mating occurs oftener than eggs are deposited. They show further that, 

 as a rule, eggs are deposited not oftener than once or twice between two 

 matings. In these three features the crosses vary greatly from the normal, 

 for a very small percentage of the hybrid eggs develop, and mathig is very 

 rare. They are, however, quite normal as to the number of eggs deposited, 

 and the intervals of their deposition. The difference between normal 

 breeding and the cross, is shown by the following summary of Record HI. 



Record III. (p. 364). E. variolar'ms '^ x E. servus c?. — 120 eggs were 

 deposited from May 23rd to July 9th. This is quite the normal number, but 

 an abnormally small proportion of these eggs developed. 83 showed no 

 signs of any development, and were probably unfertilized. Five showed the 

 initial stages of development, but failed to hatch, and only 32 of the 120 eggs 

 developed to the point of hatching. Further, the deposition of many of 

 these eggs w^as abnormal. They were frequently deposited in small irregular 

 groups, such as those deposited by isolated females that have never mated. 



For more than a month during the height of the breeding season — 



