as vet msiifhcioiit to justitv ;» tinnl luduiiiriil. A tow of 

 the considerable iiuinber ol cases ot ci'(issini?-over in 

 males are herewith given: 



The KM X nil mating (Li) it, ot int. i. M md . ^ unpk^ 

 of a frequent occurrence. The K^Ih* iiidix idii.il, oi un- 

 mistakable pattern, could not be aceoiiiHed loi- otlin wise 

 than by assuming crossmg-over m the male, hut since AH 

 and RR were so much alike and wei-e not hred in it her, 

 we can not know whether l)()lh oi these were the A 

 gamete coming from crossiiiu'-(>\-er in the iiiah', or \\ heiher 

 they were RR produced parthmouvnet icalh' 1>\ the 

 parent, or one was produced 1>\- the lornier and the other 

 by the latter method. 



Discussion 



Are the female gametes in this group of grouse locusts 

 all of the same kind witli res])ect to the necessity of fer- 

 tilization, or (1.) some of them re-iuire the si)erinat(V.ooii. 

 in order to de\-(do)), and others not The bitter situation 

 is suggested by the fact that mated iiidivichials frequently 

 reproduce bisexually and partheiiouvnetically at the 

 same time. Also, often, when an indiviibial which has 

 been reproducing ])arthenogenet ically is mated she 

 thenceforth gives otTsprinu'. some exhibiting, and otliers 

 not. male parentage. In nn unmated female ])erhaps the 

 eggs that re,|uire fertilization disintegrate either before 

 or after oviposition. (The eggs are ovi})osited in the 



