From the Annals and Maqazini? of J^atubal Hisioay, 

 Ser. 9, Vol. vii., p. SOQ, June 1921. 



_0» the Mite (Acarapis wondi, Rennic) assoelattid with 

 ■^sle of Wight Bee Disease. By Stanley HuiST. 



(Published by permission of the Trustees of the British Museum.) 



"J'he discovery of the constant presence of a mife in bees 

 suffering from Isle of Wight disease is of considerable 

 interest. The first scientific account of the mite and its 

 relations with the disease has beenpublislied by the discoverers 

 (Dr. Rennie, P. B. White, and Miss Elsie J. Harvie) *. 

 The present note deals with the affinitie.? of the mite, and. 

 gives a detailed account of its external structure. My best 

 tiianks are due to the Rev. G. H. Hewison and Mr. W. 

 Ilerrod-Hempsall for giviiig me bees infected with Acarapis 

 woodi. 



Genus Acarapis, Hirst, 1921. 



Acarapis, Hirst, Proc. Zool. See. 1921, p. 357. 



Closely allied to Tarsonemus, but differing as follows : — 

 Second and third legs of larval stage very short (almost • 

 rudimentary) and without either claws or pulvillus (whereas 

 in the larva of Tarsonemus these legs are about as long as 

 the first and provided with paired claws and a pulvillus). 

 Female lacking the club-shaped pseudostigmata that are 

 present in Tarsonemus, and with the fourth leg shorter and 

 wider and provided with more numerous hairs (in this last 

 respect somewhat resembling tiie fourth leg of Scutacarus). 



* Trans. Roy. Sec. Edinburgh, lii. part 4, March 1921, pp. 737-779, 

 3 pis. f/ 



