5B A. 0. OUDEMANS, NOTES ON ACARt. 



with anterior and posterior dorsal shields ; with only one 

 median vertical hair ; cT often with deeply-incised abdomen ; 

 legs generally of equal size and shape, 5-jointed, marginal or 

 submarginal ; mandibles chelate ; maxillae with 2-jointed 

 palpi ; ambulacral caruncles subsessile, liât, round. Hypopi V 

 Living on birds. 



IX Avenzoariinae. 



Like Eustathimae, but without vertical hairs. Abdomen of 

 cT often deeply cleft. 



X Proctophyllodinae. 



Acaridae with rather Hat elongate body ; abdomen of d" 

 generally not incised, often with leaf-like appendages ; abdomen 

 of (^ generally with deep median incision, often with long 

 swort-like appendages ; soft parts of vskin wrinkled ; always 

 with anterior dorsal shield ; always with more shields ; no 

 vertical hairs; mandibles chelate ; maxillae with 2-jointed palpi; 

 legs generally of equal size, sometimes in d" legs III, or IV, 

 or both thicker and longer than legs I and II ; generally 

 femur and genu I and II united to a femorogenu ; genu I 

 and II always with dorsal backward directed ellbow ; tibia 

 I and II without ventral triangular outgrow, though some- 

 times a thick thorn-like hair simulates this ; ambulacral 

 caruncles small, round and flat. Hypopi V Living on birds. 



XI Epidermocoptinae. 



Acaridae with rather flat, generally very short, circular 

 body ; d" often with median abdominal incision ; soft skin wrink- 

 led ; with anterior dorsal shield (?); no other shields; no 

 vertical hairs; mandibles chelate; maxillae with 2-jointed 

 palps; legs with 5 joints, almost equal in size; ambulacral 



