Biological Papers. yj^ 



usually much earlier than the time given in this instance 

 Those reared in Missouri in 1870 came out on May 9 followed 

 five days later by the young mantids. For a packet of eggs 

 from which parasites issued in 1881 the date of the appear- 

 ance of the parasite is recorded as May 12 and the young 

 mantids hatched May 24, while from eggs collected in Arizona 

 in 1892 the parasite emerged April 16 and the young mantids 

 remained in the e^^ until May 12. The great disparity in the 

 relative number of male and female issuing from a single 

 packet seems a matter worthy of further study and record 



