A. C. OUDEMANS, NOTKS OX ACARI. 43 



Found by me. 

 Type in collection Oudemans. 



Remark. Probably this is the deutonympha of P. voigtsi 

 Oudemans. 



4. Results of my having made acquaintance with 

 Syringobia. — New Classification of Acaridae. 



Suppose we have under examination a male and a female 

 of Syringobia chelopus Trt. et Neum. and wish to determinate 

 the species by means of the key of Das Tierreich, 

 Lief. 7, Demodicidae und Sarcoptidae. We begin with the 

 key on p. 8 : 



»In alien Entwickeliingsstadieu parasitisch; weiches Integu- 

 »ment fast stets mit parallelen Faltenlinien ; Beine oft ohne 

 »Kralle (vor allem die Hinterbeine) und die Haftlappen fast 

 stets gestielt, napfförmig, nicht blattförmig« .... 2 



ilm lebenden Gewebe der Wirte lebend« 3 

 Nur auf der Haut und deren Anhängen lebend« . . 4 

 Stop ! The first obstacle ! Syringobia does not live in the 

 living tissue, nor on the skin, nor on appendages of the skin, 

 but in the quills. But let us admit that the living ina 

 quill yet is a living o n the skin ; then we are referred to 4 

 Gt-nitalnäpfe bei beiden Geschlechtern gut entwickelt ; auf 



\ Insekten lebend Caneslriniinae, 



JGenitiilnäpfe fehlen, höchstens rudimentäre beim d" ; auf 



! Wirbeltieren lebend 5 



Stop ! The second obstacle ! Syringobia, nay all J the 

 Äimlginae, are provided with genital suckers in their proto- 

 nymphal, deutonymphal, female and male state, which are 

 even easily discernible with an enlargement of about 60 diame- 

 ters. But the genital suckers of Syringobia are relatively very 

 small, not »gut entwickelt«, and the species does not live on 

 Insects. Well, let us admit that either Canestrini never observed 



