128 (db. a. c. oudemans) list of dutch acaei. 



From the passage «j'ai cru voir que ces espèces de crochets sont 

 placés sur de petits bras exactement appliqués contre les côtés de 

 la tête, et qui ne semblent faire qu'un même corps avec elle, 

 dont la grosseur est augmentée par ces mêmes bras » we may 

 safely conclude that his mite was a Cheyletus. 



Van Leeuwenhoek too compares the palpae with our arms and 

 the combs with our hands and fingers. 



Schrank speaking of Chejjletus erudltus does not use the term 

 « arms » ; he calls the palpae « pedes primi paris » ; nevertheless 

 he speaks of a movable thumb (poUex) and fingers (digiti). 



It is more than surprising that nobody has remembered the 

 Acarus sqiiamosus of De Geer , since Cheyleü with squamae (= fan 

 shaped hairs) were found and described. 



The scale-bearing Cheyleti hitherto described or figured, as far 

 as I know , are : 



Cheyletus ornatus Canestrini and Fanzago (Att. R. 1st. Ven. Sc. 

 Lett. Art. 1877, (5) IV, p. 79, t. 5, f. 2), found on the pine-tree. 



Cheyletus f ahelUg er Michael (Trans. R. Micr. Soc. 1878, I, 

 p. 135, t. 6), found in a dark cellar, feeding on Glycyphagus 

 palmifer. Michael is struck by the resemblance of these scale- 

 formed hairs to the leaf-like hairs of Glycyphagus palmifer^ and 

 is asking whether it may not possibly be an instance of mimicry 

 useful to the Cheyletus. Since, however, Cheyleti with scale-shaped 

 hairs have been found on the pine-tree and in other places, where 

 the presence of these ornaments is not explicable by mimicry , 

 this idea must totally be abandoned. 



Cheyletia laureata Haller, in Arch. f. Nat. 1884, 50. p. 234, 

 t, 16, f. 9, found in or on? 



Cheyletus saccardianus Berl. Ac. Myr. et Scorp. hue. in Italia 

 rep. XXXIII. 2. 1886, found on plants and trees. 



Cheyletia laureata Karpelles (non Haller) in Math. u. Naturw. 

 Ber. a. Ung. , 1893, XI, p. 124, found on decaying vine-roots. 



Cheyletus Sp. Oudemans (Tijdschr. v. Entom. 1881 , Vol. XXIV, 

 only figured, t. 2, f. 8 and 12, t. 3, f. 17). This is the present 

 species , Acarus squamosus De Geer. It was found by me on Fringllla 



