The house-fly, Musca domestica Linn: its structure, habits, development, relation to disease and control . (1877) describes a form,Trombidium parasiticum, which is a minute blood-red mite para-sitic on the house-fly. He says: In this country they do notseem so prevalent, but Mr Riley mentions that in North America, ^ I have since endeavoured to throw some light on this question by keepingChernes and flies in small vials. In no case, however, did I observe the Chernesfeeding on the living fly, although they would feed occasionally on the dead flies. MITES BORNE 1!V llol SK-KIJKS 155 in some sea
The house-fly, Musca domestica Linn: its structure, habits, development, relation to disease and control . (1877) describes a form,Trombidium parasiticum, which is a minute blood-red mite para-sitic on the house-fly. He says: In this country they do notseem so prevalent, but Mr Riley mentions that in North America, ^ I have since endeavoured to throw some light on this question by keepingChernes and flies in small vials. In no case, however, did I observe the Chernesfeeding on the living fly, although they would feed occasionally on the dead flies. MITES BORNE 1!V llol SK-KIJKS 155 in some seasons, scarcely a i\y can be caught that is not infestedwith a number of them clinging tenaciously round the base of thewings. As it only possessed six legs it was doubtless a larvalfonii. This species was named Atoma parasiticuin and laterAstoina parasiticum by LatreilK. Mr A. D. Michael informedme that the genus was founded on Tromhidiuvi parasiticuin ofde Geer. They were really larval Trombidiidae and Atoma wasfounded on larval characters; probably any laival Tromhidiuvicame under the specific Fig. 70. M. domestica infested with TroinhidiKin mites (X).Magnified nearly six times. Howard (1911) quotes the following on the authority of Banks:Latreille based a new genus and species on mites from thehouse-fly and he called it Atomus parasiticum. This is the youngof one of the Harvest Mites of the family Trombidiidae but theadult has not been reared and is still unrecognised in found these harvest mites on house-flies in Missouri, in someyears so abundantly, he says, that scarcely a fly could be caughtthat was not infested with some of them clinging tenaciously^ Magazin Encijdopediquc, Vol. iv, p. , 1795. 156 ARACHNIDS AND MYRIAPODS at the base of the wings. Later he succeeded iu rearing theadult, and described it as Trombidium tnuscarum. In recentyears Oudemans has described Tromhidium muscae from larvalmites found on house-flies in Holland. All these forms
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