DH. JOHNSTON ON THE ACARIDES OF BERWICKSHIRE. 227 



transparent, and in shape not unlike the parent, but it has 

 six legs only and creeps very slowly. M. Dugbs says that it 

 undoubtedly passes through the immoveable nymph or pupa 

 state before the full complement of legs is acquired. 



M. Dugbs believes that these mites pass the winter 

 under stones, concealing themselves there when the infested 

 leaves have fallen. In a garden near Paris he found several 

 individuals thus concealed in the month of October ; they 

 were of a uniform brick-red colour, and had lost as yet none 

 of their agility nor of their spinning power ; and on them 

 he observed most distinctly the secreting papilla of the thread. 



3. ACARUS LONGICORNIS, Lin. 

 Acarus petrarum ruber, antennis rostro longioribus, Linn. 

 Faun. Suec. p. 349, no. 1205. — Acarus longicornis, Lin. Syst. 

 1026. (exclus. syn. Geoff.) 



Hab. The sea-shore, on rocks above high- water mark, com- 



mon. 



D|pc. Animal of a scarlet colour, about 4th in length, neat 

 and pear-shaped. Body dark blood-red, narrow-elliptical, 



