Sarcoptidm Cavicola. 



151 



The second group is equally harmless, but as it lives in or 

 among the feathers it might be mistaken for psoric acari. 



The genera of this second group are tabulated as follows by 

 Megnin : 



SARCOPTID^ PLUMICOLA. 



Females resemble the males, but without copulatory bursae. Dermoglyphus. 



Females 



differ 

 from the 

 males 

 which 

 have all 

 copula- 

 tory 

 bursae. 



Adult females 

 have abdomen 

 always round- -j 

 ed and bristly 



Abdomen of 

 male has 

 bristles o r 

 scales; third 

 pair of legs 

 never very 

 large. 



Legs similar and subequal 

 in the two sexes, and bear 

 suckers PteroUchus. 



Four anterior limbs mar- 

 ginal ; four posterior, 



short, subabdominal 



Freyana. 



Limbs all marginal ; third 



pair slightly larger 



Pteronyssus. 



Abdomen of males 

 rounded or lobulated 

 and bristly ; third 

 pair of limbs larger ; 

 fourth pair small. 



Abdomen round. 



Analges. 

 Abdomen lobula- 

 ted 



Dermaleichus. 



Adult females have 

 abdomen lobulat- 

 ed carrying scales 

 and bristles. 



' Abdomen of male shortened and bear- 

 ing a pair of foliaceous appendices. 



Proctophyllode . 

 Abdomen of male shortened and bear- 

 ing appendices as \>x\s,\\&&..Pterodectes . 

 Abdomen of male lobulated and bear- 

 ing bristles Pterophagus. 



SARCOPTID^ CAVICOLA. 



Cytodites Nudus : Body smooth, hairless, longer than broad, viviparous, 

 larval stage transient ; live five or six days in the dead tissues. Habitat : in 

 bronchia, air sacs, lungs, air cavities of the bones (intestines), of gallinacese. 

 Cochin cocks suffered most, in wet weather. Lesions : Congested mucosa, 

 mites in yellow gelatinous masses and false membranes ; in bowels, enter- 

 itis, (alleged in kidney, liver, etc.) Symptoms: Few may prove harmless, 

 many cause inflammation, exudation, dyspnoea, anaemia, wasting, diarrhoea, 

 dulness, drooping, feebleness ; plumage dull, lifeless, dirty, draggled ; 

 comb pale in weak, cyanotic in plethoric. Duration, a few days to months. 

 Prevention: Raise new flock from eggs, in incubators, on fresh, sound 

 ground ; sacrifice the old, burn or boil carcases, disinfect (mercuric chloride 

 1:500) houses and runs. Burn manure, sweepings. Treatment: A few 

 drops of solution of naphthalin, camphor or asafoetida into the trachea 

 every second day. 



