124 [Jnne. 



examples, aro often more or less elouded with black, or may even be 

 entirely black so as to resemble those of A. ovafida yry. fuscata. 



One most noticeable sexual difference between the 6 and ^ of 

 A. wilkeUfi is that the cS has a clothing of long pale hairs over the 

 greater part of the 1st abdominal segment, while in the $ this segment 

 is for the most part glabrous. 



In all or nearly all stj'^lopized males the clothing of this segment is 

 much reduced so as to approximate to the female condition, and further, 

 the short pale hairs at the middle of the base of the second segment are 

 reduced to still further minuteness so as to be scarcely visible. 



In female bees attacked by Sti/Iops the segment that lies in front 



of the head of the StyJops itself has often a quite abnormally dense 



clothing of short, pale, appressed hairs. The effect produced by the 



$ Sfyloj)s, even when two parasites are present, is normalh" much less 



noticeable than that produced by the S . 



The changes mentioned above in the clothing of the stylopized male 

 are particularly interesting, seeing that it was in this species that m}^ 

 dissections showed, that the essential male genital organs were little or 

 not at all affected by the parasite. On the contrary, the stylopized 

 females have not assumed a condition of abdominal clothing comparable 

 with that of the male. 



5. A. nit Ida Fourcr. — If the Stylojjs that attacks this bee is 

 S. melittae, it is remarkable how rarely it is affected as compared wdth 

 A. nigroaenea. A ver}" fine stylopized example was taken near Paignton 

 by mv eldest son last year. It is a $ and bears three visible (and 

 possibly one concealed) female parasites. The head is small, the scopae 

 evidently deficient. The third segment is clothed with very short white 

 hairs over most of its surface, as also is the fourth ; on the apical im- 

 pression the depressed hairs form a complete pale band. A small $ in 

 F. Smith's collection is comparatively little changed from the normal, 

 but it carries only a single 5 Stylops. 



6. ui. fjwynana K. — The few examples of each sex that I have 

 examined belong to the second brood. Neither the females nor the 

 males that bear female Sfylops are greatl}^ changed, but a 6 from 

 which (S Stylojys has emerged (captured by A. H. Hamm at Tubney 

 near Oxford) approaches somewhat in condition to that of badl3''-affected 



:S nigroaenea, as described above. 



Westwood reported that he had taken this bee (presumably the 



