CLASSIFICATION OF THE TYEOGLYPHID^. 37 



D. Cephalotliorax and abdomen plainly divided ; the 

 legs thick, especially the four anterior; the hinder 

 part of the body furnished with a few fine hairs. 



E. Doubtful Sarcoptidge, the cephalothorax plainly 

 divided off, the abdomen longish, the legs diminishing 

 rapidly below the knees. 



Koch remarks that Section E can hardly remain in 

 the genus. 



Sections A and C of this classification unquestionably 

 constitute the present genus Glycyphagus, A being the 

 species with finely-feathered body-hairs, and C those 

 with strongly-feathered body-hairs, such as G.plumiger. 

 It is true that Koch says that Section A has simple 

 body-hairs, but he evidently had not instruments 

 capable of detecting the pectinations when they were 

 fine, for he includes in this section Acarus spinipes, 

 and what he calls Acarus siro, but his siro is really 

 Glycyphagus domesticus. There cannot be any doubt 

 that his two species are Glyoyphagi, because Koch 

 draws the projecting bursa copulatrix of the female, 

 which is so characteristic of that genus. . The third 

 species, Setosus, is more doubtful, and may probably 

 have been a Oarpoglyphus. 



Section B must probably be considered as equal to 

 the present genus Tyroglyphus, although apparently 

 containing some things which would not now be 

 included therein. 



Section D is the present genus Aleurobius. 



I doubt if it be possible to say what the two creatures 

 forming Section E really are. 



Professors Giovanni Canestrini and F. Fanzago 

 in 1877 published what may be considered a first 

 effort at classification of the Tyroglyphidse.* It was 

 entirely abandoned by Professor Canestrini in his later 

 classification given below ; still it is well to mention it. 

 The following is a translation : 



* " Intorno Agli Acari italiani," in ' Atti 1st. Veneto,' Ser. v, vol. iv, 

 p. 196. 



