C.2 ANIMAL PAEASITES. 



Family of the GAMASIDA = Beetle-lice. 



Corpus oblongum, depressum, interdum clypeiforme ; pedes 

 longitudine varii, articulis inter se cequalibus, in apice libero 2 

 unguiculis et prccterea arolio armati palpi liberi, filiformes, pariter 

 articulati ; organa manducatoria variantia, mandibulce acres, ad 

 terebrandum idonece, non uncinatte (vide Ixoda). Animalia cceca, 

 in avibus, insectis et reptilibus parasita, plerumque nocturna et inter 

 diem prope ad stabula, receptacula et latebras animalium majorum 

 viventia. In prima juventute sex, in statu larvarum (Hypopus 

 veterum] vero 8 pedibus, quorum posteriores minimi et aroliis armati 

 sunt y instructa et mobilia. 



Sub-familia DERMANYSSUS. 



Palporum articulus 5 minimus ; rostellum acutum ; mandibulce 

 feminarum gladiformes, marium forficiformeSj unguicula longis- 

 sima ; corpus molle ; pedes anteriores longissimi ; coxae continues ; 

 larvae 6 pedibus instructa. 



Dermanyssus Avium (fig. 10). 



Oval, broader behind, flat, brownish red, by two lateral coeca ; 



thorax with a white V-shaped 



f spot, and behind this two pale 



waves, a transverse spot and two 

 points. Length about O30'". 



It lives especially in dove- 

 cotes, fowl-houses, and on the 

 perches and canes of bird-cages 

 and aviaries, where it also lays 

 its eggs, and undergoes its 

 changes of skin, only attacking 

 the birds and sucking their blood 

 at night. 



Alt saw these mites upon the 

 neck and arms of an old cachectic woman. They are white, of 

 the size of a grain of sand, extremely agile, and slipped out of 

 little excavations (which even occupied a space of Ij square line), 

 ran over the skin, and back again into their holes. 



