THE A CARINA OR MITES— BANKS. 



77 



described a species. T. (O/asie., as injurino- pineapples in Australia. 1 



have described one, T. I((f>(.'<^ which causes galls on the main shoots 



of mango plants. Another species. T. jxdJidus^ has been found on 



various greenhouse plants in this country. Karpelles descril>etl a 



species, T. intecfits (apparently identical with 



the Chrlthoptefi monwKjidcidosux of Geber), as 



attacking men in the Danube region of Hungary 



and Russia. The men had l)een handling l)arley 



and the mites spread from this to the hands. 



where they caused an irritating inflammation of 



the skin so intense as to force the men to leave 



their work. Michael has recorded a species, T. 



hancroft!^ as the cause of serious damage to 



sugar cane in Queensland and also in Barlxidos. 



T. C'n)e-'<frinN' produces small, rounded galls on 



several European grasses; 7] Hplriftx forms 



elongate swellings on oats. But few remedies 



have been proposed for these mites; a mixture 



of powdered sulphur in soap and water has been 



suggested for the one on sugar cane. Probably the remedie 



''red-spider'' will be found applicable to them. 



The curious genus, Disjxwipes^ has a migratorial n3'mphal stage much 

 like the Il>/jx)pus of theTyroglyphida\ This stage has been found on 



Fig. 150. — Pigmeophorus 

 americanus, from above, 

 and tarsus enlarged. 



for 



Fig. 151.— Pigmeophorus amerkanus, 

 from below. 



Fig. 152. — Disparipes americanu.s, from 

 below, and claw. 



bumblebees and ants. The adults occur on plants. I have seen spec- 

 imens of an American species taken from a bee of the genus Ilalictus. 

 Berlese has recentl}' described a number of species taken from ants, and 

 proposes to divide the genus into three groups, the two new ones being 

 DiversijjeK: and JiiijKiripes; ^the characters, however, are very slight. 



