DESCRIPTION 



sory gland to form a common duct which connects 

 with the penis. Internally the testes are sub- 

 divided into a number of cysts. Scattered 

 throughout the testes of immature individuals 

 are spermatogonia! cells many of which are in 

 compact rosettes. Some are in larger, looser 

 rosettes. In the gonads of late pupae matura- 

 tion division figures and even some spermatids 

 may be observed, but gonads of freshly eclosed 

 males show the highest percentage of cells in 

 active division and have, therefore, been stud- 

 ied most intensively. 



Definite types of reactions characteristic 

 of sex are found in Habrobracon. The females 

 sting the host caterpillars on which they sub- 

 sequently feed and lay their eggs. The males 

 are entirely indifferent to caterpillars, but 

 they show characteristic reactions towards fe- 

 male wasps, such as flipping wings, mounting, 

 and beating with wings and antennae in the proc- 

 ess of mating. 



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