SEX-DETERMINATION OF HADROBRACON BREVICORNIS. 253 



TABLE I. Continued. 



laboratory and for his kindly help and criticism. The work 

 has been done by aid of a Harrison Research Fellowship of the 

 University of Pennsylvania. 



In November, 1916, a female wasp ( 9 No. i) was found in 

 cultures of the Mediterranean flour-moth at the Zoological 

 Laboratory. A little later some cocoons of the wasp were found 

 and these were isolated in vials. Both males and females emerged 

 from the cocoons. The females were not mated but produced 

 parthenogenetically families consisting entirely of males. 



