Dermatophagic Scab. Aearus Mange. 967 



since botli varieties of mites present only few differences (see 

 page 965). 



In geese, Eailliet observed scab of the feathered parts of the body caused by 

 the Kneniidocoptes prolificus. Ou the head, especially around the beak and the eyes, 

 further under the mandible, punctiform, hard nodules formed which contained 

 sexually mature females, also many eggs and larvae of the mites. 



Railliet was successful in treating scab of the feathered 

 parts with daily sulphur baths ; fresh feathers grew on the bald 

 surfaces. In general the same remedies may be employed as in 

 foot mange. 



3. Dermatophagic Scab. It is caused by the Dermato- 

 phagus gallinarum (Epidermoptes bilobatus Rivolta and E. 

 bifurcatus) and begins on different parts of the body, princi- 

 pally on the neck and breast ; in severe cases it may even attack 

 the whole body, the comb and the wattles not excepted (Pried- 

 berger). Fine, transparent, yellowish scales first appear on 

 the skin, mostly without itching (Rehm also noticed itching) 

 which thicken later on to form strong, dirty brown, doughy 

 crusts. Then the skin appears thickened and tumefied (Rehm). 

 Within a short time the birds become emaciated and ex- 

 hausted, and not infrequently a fatal termination is observed. 

 This form of mange now and again develops along with foot 

 mange and perhaps also with scab of the feathered parts of the 

 body. 



Since dermatophagus mites not infrequently produce no 

 disturbances in the health of fowls, one should always make 

 sure when they are present whether in such cases the skin 

 changes may not be brought about by vegetable parasites 

 (Tricophyton, Achorion) (Neumann). 



The treatment is the same as in foot mange. Kitt recom- 

 mends a 5% solution of epicarin. 



Literature. Brandl & Gmeiner, W. f. Tk., 1900, 349 (Lit.).— Friedbergor, 

 D. Z. f. Tm., 1881, VII, 281. — Megnin, Les parasites et les maladies parasitaires, 

 1880. — Neumann, Maladies paras, des oiseaux dom., Paris, 1909.- — Rehm, B. B., 1901, 

 264.— Eeichert, Die Fussriiude d. Gefliigels, Diss. Giessen, 1909 (Lit.). 



22. Aearus Mange. Acariasis. 



{Akarusaussclilag, Haarsackmilbenausschlag [German] ; Gale 

 domestique [French].) 



The aearus mange of the domestic animals is a contagious 

 skin disease caused by the aearus mite, which is characterized 

 by the absence of, or by slight itching, by falling out of the 

 hair mostly with simultaneous desquamation, or by pustule 

 formation with subsequent decided thickening of the skin. 



History. The aearus mite was discovered by Berger (1841) in the 

 external ear passag'es of man, Init he did not announce his discovery 



