TROMBIDIUM TLALSAHUATE 353 



[Leptus autumnalis attacks small mammals by preference, such 

 as moles and hares, which are often literally covered with them. 

 Dogs are also subject to their attack and cats suffer similarly. This 

 mite also frequently appears in colonies in cows ; cavalry horses after 

 autumn manoeuvres often suffer from an erythematous affection 

 about the hocks and knees due to this pest. 



A number of Leptus, so far undescribed, occur abroad which 

 attack man in the same way to L. autumnalis here. Dr. Durham 

 has brought me specimens from British Guiana called Bete rouge ; 

 these work under the skin much as does our European species, 

 but it is very distinct, being considerably larger. F. V. T.] 



Trombidium tlalsahuate (Lemaire), 1867. 



Trombidium tlalsahuate occurs in Mexico under conditions 

 similar to those of Leptus here. It also frequently attacks men, 

 and by predilection fastens itself on to the eyelids, in the axillae 

 or navel, or on the prepuce ; it induces itching and swelling of 

 the parts affected, and sometimes even causes suppuration ; the 

 symptoms, however, generally disappear after a week and remain 

 localised. 1 



Other species of mites which attack man are reported, mostly 

 by travellers, from various other places ; zoologically, however, 

 there is little known about them. The Pou d' Agouti in Guiana, 

 Niaibi in New Grenada, Colorada in Cuba, Mouqui in Para, 

 represent a few of these. 2 



An., 1871, Hi., p. 255); Kramer, " Beitr. z. Kenntn. d. Lepf\ aut." (ibid., 1872, lv., 

 p. 354) ; Megnin, P., " Mem. s. 1. metamorph. d. Acariens " (Ann. d. sc. nat. Zool., 

 1876 [6], iv., Act., No. 5); Floge), J. H. L., " Ueb. ein merkw. durch Paras, hervorger. 

 Gewebsneubld." (Arch. /. Naturg., 1876, xlii., 1876, p. 106) ; Henking, H., "Beitr. 

 z. An., Entw. u. Biol. v. Tromb. fulig." (Z. /. w. Z., 1882, xxxvii., p. 553); Megnin, P., 

 " Les Acar. par." (Encycl. scientif. des aide-mem., Paris) ; Moniez, R., " Sur les diff. 

 Acariens, qui s' attach, d I'homme et qui ont recu le nom de rouget " (Rev. biol. du Nord 

 de la France, 1894-95, vii., p. 301), Traite de parasit., Paris, 1896 ; Brand is, F., " Ueb. 

 Lept. aut." (Fests'hr. z. 50 jahr. Besteh. d. Prov. Irrenanst. Neitleben bei Halleyi- S., 

 1897, P- 4 X 7) Brucker, " Sur le rouget de I'homme" (C. R. Ac., Paris, 1897, cxxv., 

 [2], p. 879); Megnin, P., " Observ. sur les rougets " (ibid., p. 967); Thiele, J., " Die 

 Gras-oder Erntemilbe, eine Plage d. Feldarh." (Dtsche. landw. Presse, 1898, No. 98, p. 1016). 

 Trouessart, E. L., "Sur la piqure du rouget" (Arch, de paras., 1899, ii., p. 286); 

 Hanstein, R. v., " Beitr. z. Kenntn. d. Gttg. Tetrany'chus Duf. nebst Bern. ub. Lept. aut." 

 (Z. f.w. Z., 1901, Ixx., p. 58). 



1 Lemaire, "Import, en France du tlalsahuate" (C. R. Ac., Paris, 1867, Ixv., p. 21 0; 

 Altamirano, F., and Duges, A., " El tlalsahuate " (Fl estudio, 1892, iv., p. 196) ; Riley, 

 " The Mexican Jigger, or tlalsahuate " (Insect Life, 1893, iv., p. 211). 



2 Bonnet, G., " Contr. d V etude du paras" (These de Montpellier, 1870, No. IT, p. 53). 

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