Guide to the Crustacea, Arachnida, Onychophora and Myriopoda exhibited in the Department of Zoology, British Museum (Natural History) .. . Fig. 74. Sarcoj>tcs scabivi, the itch mite, x 100(after Cauestrini). S U B - O K D E i;, V. ASTIGMATA. In these Acari, which are closely alUed to the Prostifpiiafa, there is no trace of a respiratory system. Many of them are parasitic, otiiers are free-living and feed on animal and vegetable refuse.It is to this sub-order that themite (Sarcoptcs scahici) whichis the cause of itch belongs.The cheese mite (Tjjroijhjphussiro) is perhaps the most fami-liar o
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Guide to the Crustacea, Arachnida, Onychophora and Myriopoda exhibited in the Department of Zoology, British Museum (Natural History) .. . Fig. 74. Sarcoj>tcs scabivi, the itch mite, x 100(after Cauestrini). S U B - O K D E i;, V. ASTIGMATA. In these Acari, which are closely alUed to the Prostifpiiafa, there is no trace of a respiratory system. Many of them are parasitic, otiiers are free-living and feed on animal and vegetable refuse.It is to this sub-order that themite (Sarcoptcs scahici) whichis the cause of itch belongs.The cheese mite (Tjjroijhjphussiro) is perhaps the most fami-liar of the non-parasitic forms.xother species {GlijcijjjJiagusdomesticus) is often found inhouses. Drawings of these twospecies are shown in Table-case 26. A tuft of wool, with some oftlie flesh still attached, showingthe scab caused by a Sarcoptidmite {Psoroptes communis, var.?p r-g ovis), together with drawings . ^, , , , , . of the mite itself, is on view Houiic-n-wte, GlycypJiagus domestiais, . X 50 (after Michael). m the North Hall.. 114 Guide io Aiachnida. Table-caseNo. 26. Sub-ORDER VI.—VEEMIFOEMIA. The Acari belonging to this sub-order are degenerate, parasiticforms without tracheae, and with tlie posterior portion of thebody produced into an annulated caudal prolongation. The third, fourth, fifth, and sixth pairs of appendages are short and three-jointed. The sub-order includes the single family Dcmodicidac, themembers of which live in the sebaceous glands of the skin of manand other mammals. A drawing of Demodcx caninus, a specieswdiich gives rise to follicular mange in dogs, is exhibited in Table-case 26. This mite is about one-eightieth of an inch in size.