130 



rJime, 



tlie rather strong gusts of wind. Many female Sfi/lop^ entirely failed 

 to attract any male, and it is evident that only certain individuals have 

 or at any rate exert this power, this probably depending on their age or 

 the state of develojnuent of the ovaries. 



On May 4th I obtained a c? S. wilJcellae firmly connected with the 

 $ , while the host was resting on a daisy, and my son took a similar pair 

 in the same situation. His pair became separated in the net, but that 

 taken by me not till long after capture, in fact not until both bee and 

 S Stylops were recovered from the anaesthetic, which had been used to 

 allow of their close examination. 



So far as stylopized And^^ena wilkella is concerned, the following 

 notes may be of interest. All the captures were made in one very long, 

 but narrow, pasture-field, in which was a plentiful supply of flowers, 

 buttercups, daisies and dandelions. A line of gorse bushes in bloom 

 formed the front of one of the long hedges. Man}^ of the stj^lopized 

 bees were captured by m}' eldest boy. 



Bees Captured. 



Date of Cai)ture. 



Containing (S Pnparia ^ ,,, -p 

 $ Stylovs. (mostly hatched). "-^^^^^^ ^^es. 



April 24th 



3 i 



„ 27th 



„ 28th 



13 12 



21 17 



7 5 



23 43 











12c? 



„ 29th 



May 4th 





67 77 



16(^ 



1 



In some cases two or more $ , or tw^o or more (S Stylops were fomid 

 in the same host, so that the number of parasites considerably exceeded the 

 number of parasitized bees. 



The well-known fact that stylopized bees appear abroad in geneml 

 before the healthy ones is well shown. Thus health}^ examples were 

 only beginning to be common on May 4th, and up to this time not a 

 single healthy $ was taken, that sex being as a whole later in appearance 

 than the <S . 



Until April 27th all specimens taken were stylopized, while up to 

 May 4th 90 percent, were affected. If furtlier investigations* were 



* On May 7th a survey by my sons showed •% per cent, parasitized, and another on the Uth 

 less than 10 per cent, aflfected. 



