A. C. OUDKMAXS, NOTES ON ACARI. 55 



1 will try to give here the diagnoses or short descriptions 

 of the Acaridae in general and of each subfamily, and 1 hope 

 there will but little be changed in thera in future. 



Acaridae. 



Ai^ari with generally short body (except e. g. a few species 

 which live in spools of feathers, the length of which may be 

 four times the width) ; generally with soft skin (except e. ff. 

 Chortoglyphus) ; generally with wrinkled soft parts of skin (except 

 lyroglypiiincw and Hemimrcocoptinae); generally with one or 

 more dorsal shields (except Hemisarcoroptes): always with 

 epimera and epimerites ; legs generally with 5 free joints 

 (except several Proclo phyllodinae) ; palps with 4, or 3, or 2 joints 

 (except Cytodyti's which has no palps); mandibles chelate 

 (except Cytodi/te-s, where the mandibles and maxillae together 

 form a sucking apparatus, and Linobia and Aìioetus, where 

 the mandibles are saw-like or knife-like) ; ambulacra generally 

 with caruncle (except e. g. RhLoglypims, legs I and II of 

 LcuninocopUs, etc.), sometimes also with claw {7yroglyp/iinae, 

 Fsoroptef<). (In instances where the ambulacra themselves miss 

 the claw, the tarsus itself may be claw-like, or be provided 

 with claw-like hairs). 



I. Tyroglyphinae. 



Acaridae with short body ; generally with soft skin (except 

 e. g. Chortoglypiius, (z/^yo/z^Aaf/Ms /m.som.s) ; skin un wrinkled (except 

 some parts in hypopi) ; generally without dorsal shield (except 

 Suidasia, Canefitrinia, Chortoglyphus, a few species of Glycypha- 

 gus) ; always with a pair of vertical hairs ; mandibles generally 

 chelate (except Anoettis with saw-like, or knife-like ones) ; 

 maxillae provided with 2-jointed palpi ; legs submavginal with 

 5 free joints ; auilmlacra with claw nnd carunde, or only 



