396 PROCT!EDINGS OF THE NATIONAL MUSEUM. vol.54. 



The following additions should be made to the summaries of the 

 interrelationships of the parasites and hosts on pages 25 and 26 of 

 Bulletin 66 : 



SEX OF HOSTS EXAMINED. 



Polistes metricus (Wheeler, 1910), 1,000 wasps; 13.7 per cent 

 males, 86.3 per cent females. 



Polistes variatus (McAtee), 61 wasps, 100 per cent females. 



Stenocranus saccharivorus (Jones), 150 leaf hoppers; 47.3 per cent 

 males, 52.7 per cent females. . 



SEX OF PARASITIZED HOSTS. 



Andrena nigroaenea (Theobald, 1892), 40 bees; 45 per cent males, 

 55 per cent females. 



Andrena praten^is (Friese, 1883), 32 bees; 46.8 per cent males, 

 53.2 per cent females. 



Andrena tibialis (Enock, 1875), 46 bees; 82.2 per cent males, 17.8 

 per cent females. 



Polistes annularis (Nebraska records), 8 wasps, 100 per cent fe- 

 males. 



Polistes metricus (Wheeler, 1910), 251 wasps, 9.9 females. 



Polistes variatus (McAtee), 31 wasps, 100 per cent females. 



Stenocranus saccharivorus (Jones), 51 leaf hoppers; 41.1 per cent 

 males, 58.9 per cent females. * 



PARASITISM OF MALE HOSTS. 



Polistes metricus (Wheeler, 1910), 137 males; 18.3 per cent para- 

 sitized. 



Stenocranus saccharivorus (Jones), 71 males; 29.6 per cent para- 

 sitized. 



# 



PARASITISM OF FEMALE HOSTS. 



PoliMes metricus (Wheeler, 1910), 863 females; 26.2 per cent 

 parasitized. 

 Polistes variatus (McAtee), 61 females; 52.5 per cent parasitized. 



PERCENTAGE OF PARASITISM ACCORDING TO SPECIES. 



Polistes metricus (Wheeler, 1910), 1,000 wasps; 25.1 per cent para- 

 sitized. 



Polistes variatus (McAtee), 61 wasps; 52.5 per cent parasitized. 



Stenocranus saccharivorus (Jones), 150 leaf hoppers; 34 per cent 

 parasitized. 



SEX OF PARASITES. 



Polistes annularis (Nebraska), 62 parasites; 85.4 per cent males, 

 14.6 per cent females. 



Polistes metricus (Wheeler) , 562 parasite.s ; 78.8 per cent males, 21.2 

 per cent females. 



