A. e. OUDK.MANS, NOTfó' OS' ACAHÌ. 50 



Caruncle on short pedurcles, bell-shaped; no genital suckers; 

 cT with anal suckers ; epimera I free, often wide apart. No 

 hypopi. Living on birds. 



XII Psoroptinae. 



Acaridae with rather flat, generally very short body ; cf often 

 with median abdominal incission ; soft skin wrinkled; always 

 with anterior dorsal shield; d" also with posterior one; no 

 vertical hairs; mandibles chelate, elongate; maxillae with 

 2-jointed palpi ; legs rather long, 5-jointed, anibulacral caruncle 

 small, pedunculate ; ^ legs III without ambulacra, but with 

 long hairs ; cT with genital and anal suckers ; ^ without 

 such ; epimera 1 free, often wide apart. No hy})opi. Living 

 on mauimals, causing an itch, but do not burrow cuniculi. 



XIII Psoralginae. 



AcaridiU' with rather flat, short body; ^ with deep median 

 abdominal incision; soft skin wrinkled; always with median 

 dorsal shield; no other shields('r'); no vertical hairs; mandibles 

 chelate; maxillae with 2-jointed palpi; legs almost equal in 

 size, except in the male, where legs III and IV are thicker, 

 legs III even much longer ; larvae and nymphae perfectly 

 resemble those of Psoroptinae^ adults those of Pteronyssus,, 

 abdomen of cT, however, that of Mégninia. No hypopi. Living 

 on mammals; the larvae and nymphae live in colonies in sub- 

 cutaneous bladders, causing a kind of itch: the adults live 

 free among the hairs of the host. 



XIV Heteropsorinae. 



Acaridae. with rather flat very short almost circular body ; 

 soft skin wrinkled ; dorsal shield ? ; no vertical hairs; mandibles 



