A. C. OUDEMANS, NOTES ON ACARI. 47 



b. Mares pedibus terlii vel quarti paris valde ceteris maioribiis 

 ab iisdein foeminae m-dgmtndinediveYsis {cnissioribus) Anahfesina.« 



»11. Foeminae adultae in abdomiue postico apophysibus 

 chitineis ensiformibus vel corniculis praeditae. Proctophyllodina.'' 



As I already observed bereabove the living in spools of 

 feathers is not a characteristic, as other .\nalgidae oìien ào no. 

 The division of the Analjidae in two groups of w^hich the 

 one has females with an undivided abdomen (»only provided 

 with bristles"), and the other females with an abdomen which 

 is deeply cleft, so^that it apparently ends in two horns (,,cor- 

 niculae") is very good and a natural one. But further, as to 

 the Syrin<iohiinae^ Berlese leaves us behind. But look! after 

 the word Syringohiina an asterisk invites us to consult the 

 foot-note. Here we read : 



»Symtgobidiiia ex speciebus propter vitae methodum charac- 

 teribus peculiaribus insignitis constituta videntur et ex ceteris 

 analgesidarum generibus procedentibus, quod genus Thecharthra 

 generi Pterolichus correspondit; genus Syringobia generi Pseud- 

 alloptes ; genus Neumannia generi Xoloptes ; genus Dermogly- 

 phus et Spherogastra generi Pteronyssus.«. 



Oh dear! If Berlese is right, the subfamily of «Sì/n'w^oòu'wa is 

 not a natural one, consequently does not exist ; and on the other 

 hand the diagnoses of the other families are fault. 



You observe, we gradually are entangled ! 



And so I was compelled to compare my different prepara- 

 tions and the different descriptions and drawings in my 

 possession, and finally I observed that the whole classification 

 of the Acai^dae (Sarcocoptidae) wants an entire revision. 



First we must settle more importance to particular hairs, 

 e. g. to the vertical hairs. They are very characteristic. Most 

 of the Acaridae are provided with two vertical hairs, ii very 

 few bear only one median vertical hair, and again many are 

 deprived from them. If we form groups basing on them, 

 we observe these groups to be natural ones. 



