TrombidiidcB : Harvest Mites. Acari of Quills. 147 



found them in the external auditory meatus of chickens causing 

 otorrhoea. 



Among other animals attacked are the rabbit (Gurlt), goat 

 (Farez), the dog and cat (Zurn). Swallows often suffer, but the 

 dermanyssus of swallow's nests has been assigned to a different 

 species (D. Hirundinis) mainly because it is double the size. 

 Megnin describes the D. Avium as intermediate in size between 

 those of the hen and swallow. 



Treatment of Dermanyssus Acariasis. The same measures 

 recommended for phthiriasis are effective here ; remove all drop- 

 pings ; keep the house perfectly clean ; deluge the woodwork 

 with boiling water or treat with live steam ; whitewash ; wash 

 with carbon bisulphide, creolin, coal tar, sublimate lotion, etc. 

 Dust the nests with insect powder, quicklime or other insecticide. 

 Furnish dust baths containing snufE, lime, insect powder, carbolic 

 acid, creolin, etc. 



Exposed mammals may be treated with the same agents mixed 

 with oil, and should be kept well apart from filthy hen roosts. 



Fowls suffering from the acarian rhinitis or otorrhoea should be 

 treated freely with olive oil introduced on a small feather or brush. 

 This is destructive to the parasite by closing its breathing pores, 

 and is soothing to the irritated integument. 



TROMBIDIID^ : HARVEST MITES. ACARI OF QUILI.S. 



Soft, hairy skin, bright color, larvae burrow in skin. Trombidium Holo- 

 sericium : Scarlet, just visible to naked eye, common in sunny, sheltered 

 localities on vegetation ; larvae burrow under cuticle in man, rodent, dog, 

 cat, horse, ox, sheep, birds, etc. ; cause intolerable itching. T. American- 

 unt : Dull brick-red, larva attacks men and animals. In sheltered, sunny 

 localities south and west in United States. T. Fuliginosum : Smoky color, 

 found in Europe. Has same habits as the others. Bete rouge of Central 

 and S. America ; Colorado of Cuba ; Niaibi of New Grenada ; Mouqui of 

 Para ; Ciron Rutilant of Savannah. Treatment : Wear leather boots ; ap- 

 ply to skin solutions of tobacco, sulphur, phenol, potassium sulphide, avoid 

 exposure to vegetation of infested places. Cheyletus of Rabbit : hexagonal, 

 yellow. Lives in fur, feeding on the listrophorus and other parasites. 

 Cheyletus of Birds : Lozenge-shaped, yellow, smaller than rabbits'. Lives 

 in feathers ; harmless. Harpirhynchus Nidulans : Nesting H. . Lives 

 among quills and on skin forming wart-like clusters ; distends quills. Syrin- 

 gophilus Bipectinatus : Live in quills ; harmless. Tetrarhynchus Moles- 

 tissimus : In quills ; harmless. 



