24 BULLETIN 66, UNITED STATES NATIONAL MUSEUM. 



The following table is based on the collection of 1888: 



2 female bees with 3 parasites each= 6 parasites. 



3 male, 6 female bees with 2 parasites each=18 parasites. 



18 male, 25 female bees with 1 parasite each=43 parasites. 



21 male, 33 female bees with 67 parasites. 



ANDRENA NIGRO-ffiNEA Kirby. 



Theobald (1892) also gives similar data concerning this species, but 

 does not state the source of his material. He found 



1 male, 3 female bees with 3 parasites each =12 parasites. 



5 male, 3 female bees with 2 parasites each=16 parasites. 



12 male, 16 female bees with 1 parasite each=28 parasites. 



18 male, 22 female=40 bees with 56 parasites. 



ANDRENA OVINA Klug (PRATENSIS Nylander). 



Friese (1883) made numerous records on the parasitism of Andrena 

 pratensis. His records tabulated are as follows : 



Parasites. 



October 9: 2 female bees with 1 male = 2 males = 2 



December 11: 1 male bee with 1 male = 1 male = 1 



December 11 : 1 male bee with 1 female = 1 female = 1 



December 14: 2 female bees with 1 male = 2 males = 2 



December 14: 2 male bees with 2 males = 4 males = 4 



December 14: 1 female, 1 male bee with 1 female = 2 females = 2 



December 14: 1 female bee with] male, 1 female = 1 male, 1 female = 2 



February 26: 2 female, 3 male bees with 1 male = 5 males = 5 



5 female, 5 male bees with 1 female = 10 females =10 



1 female, 2 male bees with 2 females = 6 females = 6 



2 female bees with 1 male, 1 female = 2 males, 2 females = 4 

 1 female bee with 2 males, 1 female = 2 males, 1 female = 3 



17 female, 15 male=32 bees with 19 males, 23 females=42 



In other words, the 15 male bees contained 19 parasites and the 17 

 female bees contained 23 parasites; 6 male and 6 female bees con- 

 tained males only, 9 males and 7 female bees contained females only, 

 while 4 female bees contained both sexes. 



ANDRENA TIBIALIS (ATRICEPS) Kirby. 



Enoch (1875) on April 5 and 6 took, on Hampstead Heath, England, 

 45 stylopized and 27 unstylopized specimens of Andrena tibialis 

 (atriceps). His records tabulated are as follows: 



1 male bee with 3 females= 3 females= 3 parasites. 



1 male bee with 1 male, 2 females= 1 male, 2 females= 3 parasites. 



1 male bee with 1 male, 1 female = 1 male, 1 female = 2 parasites. 

 1 female, 6 male bees with 2 females= 14 females=14 parasites. 



2 male bees with 2 males, = 4 males = 4 parasites. 

 6 female, 14 male bees with 1 female = 20 females=20 parasites. 

 1 female, 12 male bees with 1 male =13 males =13 parasites. 



8 female, 37 male=45 bees with 19 males, 40 females=59 parasites. 



