124 (dr. a. c. oudemans) list of dutch acari. 



generally written) as type. The two acari, even at present , belong- 

 to the same genus, consequently this genus must be called Belaust'mm 

 Von Hevden. 



7. Chei{letides. — Leach created this group for the genera C/ie)/- 

 letus Latr. , Smaris Latr., Bdella Latr., and Sarcoptes Latr. — 

 It is obvious that he took the genus CJiei/letns Latr. as type for 

 tlie group Cheijleüdes. That he reckoned the otlier genera to the 

 same group, is only a proof of the little knowledge of anatomical 

 characters of these animals in his days. They were successively 

 removed from the group , and other genera were placed into it. 

 Tt was therefore quite superfluous that Megnin « created » a (( new» 

 group, which he called « Cheylétides » {Cheyleüda(i) too. 



8. Myohìa Heyd. — Mr. A. Poppe of Vegesack, near Bremen, 

 has been so kind as to determine my collection of J/yöZ/ia-specimens, 

 for which I offer him here my sincere thanks. The species n^. 48 

 is a new one and will be described by Mr. Poppe. My preparations 

 of Mijohia prove that I nearly always found on each specimen of 

 Mus ttinsculus both Mijohia muscitU Schrank and Myohla affinis 

 Poppe, and that our country is very rich in- species of Myobia^ 

 Ilitherto 1 have met with Myolia lemnma Koch on Mus sylva- 

 ilcus . a new host, not, however on Arvìcola arvalis , though I 

 searched after them , nor with Myobia Michaeli Poppe , as I had 

 no opportunity to examine Crocidura araneus .^ nor with the diffe- 

 rent species ol Myolia of bats, as I never found Myohia on bats, 

 allhougli I have examined several species of bats in several specimens. 



9. ('heyletus eruditns Schrank. — Hitherto I have nowhere 

 found the remark that this species was already observed by Van 

 Leeuwenhoek. His description (1697) is even much more correct 

 than Schrank's (1781). In his « Sesde vervolg der Brieven, ge- 

 schreven aan verscheide Hooge Standspersonen en geleerde luiden , 

 Delft, 1097, 102 sfe Missive, Geschreven aan de Koninklijke So- 

 ciëteit in London, p. 276, he says: 



«'t buys komende sag ik tot mijn verwondering, dat eenige 

 van deze Mijten van een gansch ander maaksel waren , ais ik tot 

 nog loe eenige Mijlen liadde gezien. Want ze hadden boven op 



