246 BRITISH TYROGLYPHIDjE. 



because the two names were published about the same 

 time; but Hering's was published in 1835, and Koch's 

 not until 1841. Canestrini says that a glance at 

 Hering's figures, particularly No. 17, which is the 

 under side of the female, will show that it is G. spinipes. 

 I confess that it does not produce this impression upon 

 me ; the vulva in Hering's drawing is placed between 

 the coxaB of the fourth pair of legs, that of G. spinipes 

 is just behind those of the second pair of legs ; this 

 is a point that Hering would hardly have been likely 

 to be wrong in. Then the general shape is quite 

 different; Hering's drawing is as broad posteriorly 

 as anteriorly. G. spinipes is characterised by the 

 sudden narrowing between the second and third pairs 

 of legs, and the consequent comparative narrowness 

 of the posterior portion of the body. Again, the 

 numerous very long and conspicuous hairs on the 

 notogaster and the posterior part of the dorsal surface 

 of the cephalothorax in G. spinipes are absent from 

 Hering's drawing, and are replaced by a single pair 

 of short hairs. The great hairy scale on the third 

 leg of G. spinipes is absent from Hering's drawing, 

 and the hairs shown on the tarsi of the first and 

 second legs in that drawing are quite inconsistent with 

 the extremely fine and even pilosity of those parts in 

 G. spinipes. 



Oudemans * says that Megnin identifies G. spinipes 

 with Acorns destructor, Schrank, and Acarus setosus, 

 Koch. Oudemans does not say where Megnin asserts 

 this. I do not find any reference to the subject in his 

 1889 paper,t but in " Les Parasites," p. 139, he treats 

 Acarus destructor, Schrank, and Acarus setosus, Koch, 

 as being identical with Acarus (Glycyphacjus) domesticus, 

 de Geer, not A. spinipes, Koch. He also treats Gty- 

 cyphagus prunorum, Hering, and Sarcoptes hippo- 

 podos, Hering, as synonyms of A. domesticus. I 



* ' List,' p. 252. 



f " Observations ariatoiiiiques et physiologiques sur les Glycyphagus 



trscr et spinipes" ' J. Anat. Physio].,' t. 25, pp. 106110. 



