470 ARACIINIIU. 



terminated in vavions -ways, acrordinir to tlirir hal)its. Some of these inseets (Jcarkles, Latr.) have 

 eight legs, tit only fnr \valkiii,cc, and i'lielicei"e. 



Tj'om6/f//»;n, Fabr., lias the clielicerte terminatod by a inovealile claw; palpi projecting', pointed at tip, with a 

 moveable appendaije or tin;5:er beneath the extn-mify ; tun ('\(■:^, carli at the top of a small fixed pedunclf. T. holo- 

 sericciiiii, I'abr., \r\-y cniimiuii in [canlcns diinn;,^ sprini;-, >if a blund-rod '-oloiir, with the abdomen nearly 

 sqnare, and narniwcd brliind. A iiiuch lar.^cr t^[tecies (7*. anrhn-iiun, Faljr.) inbaluts tlic East Indies, and emits a 

 red dye. 



Eiyf/ir.rnx, Lntr., lias Mi..' clielicera- and paliH uf Trnmhiflnnri, but tlio eyes ar-e sessile, and the body not divided. 

 E. p/iahfN;/n,i,/rx. L;Ur. 



CamasKs, Latr , Ikis tlic clielicrra' didact\ le, and thr iialpi projecting:, distinct, and filiform. In some, the body 

 is covered entiix-lx, ur m part, by a scaly i,ki)i, hut in utluTs it is cntii'L-ly soft. Some of tlie latter species live upon 

 difterent birds and quadrupeds. Otijers, as the J.'ams Irlnnus, IJnn. [ur the Red Spider of the hot-houses], form, 

 upon the leaves of various ve,s:etables, especially upipu llm-r uf Iniir-tnes, very tine webs, which injuretheni greatly. 

 This species is reddish, witli a black spot on each side of tlnj abdnujen. 



C/ieijieda; Latr., has didactyle chelicenc ; but the palpi are thick, arnt-like, and tenninatcil by a sicKle-sliaped 

 joint. A. enifl'/liis, Schr. 



Orihata, Latr. {^'ulaajiis, Herm.), has the chelirer.-e also ilidnrtyle ; tlie palpi very sliort, or ciuicealed ; the body 

 covered witli a hairy, scaly skin ; feet loni.-. or nHideraie. The fiont uf the body is advanced like a beak. Found 

 uptMi stones, trees, in moss, &c. They crtT|. Imt slnuly . 



C'-opudn, Latr., has, from analoi^-y, forrcps-likr rlirhci'ra.' ; palpj not projcctiTio: ; Ijody covered uith a scaly skin; 

 legs short; anus with a Iohl; thread, by uliieh tln^ insect is attached to \aiioLis beetles, and suspended in tlie air. 

 A, vegetans^ De Geer. 



^ Acnrn.s-, Fabr. {Sar cop f (?.•{, Latr.), has two didactyle chelicera? ; palpi very short, or con- 



-~-^^.^>^*•^^-^'~r■J^,-' cealed; budy very soft ; tarsi teiininated by a vesicle. Some species feed upon our ali- 



"*^tHj^(j \~ nvntai-y substanci.'S (A. domcsllcKv, A. fnr'nur) ; others are fonnd in the ulcers of the itch 



7"^ )[\J>>,S^. '^^ in man, Ihn liorsn, cat, (hi--, &c. (A. .scal-'iri. See (lie Thesis ofDr.Galct upon this species). 



V 'TTx <"Hlier Mites nr Ticks (RiciNrn:, T.atr.) liave also eight legs, formed for walking, 



1m It de^iitiite of clielicer;c, wliicli arc replaced liy lancets, forniing, with tlie tongue, 

 ■'"if"''''-'J a sucker. Some have the eyes liistinct. 



Bdelln, Latr., bavin::: the sucker advanced and beak-like, with long-, elbijwed pal|ii, and four eyes. Scirus luixji- 

 nj.slyif:, Herm. 



iS/,i,/r/if,,i, Latr., A\ith [ial[ii short and straii,^ht, and twn eyes. .-(. sawhtici, Schr., f^c. 



The olber Ilicinije have not the eyes percc|)til>le ; tite iialpi arc in tlic shape of valves, dilated at the 

 tip, serving as a sheath to the sucker, of which tlie ]iarts are horny and tootlicd ; the body is clothed 

 with a corneous skin, or at least with a s^alv jihitc in front. These ticks are parasites, sucking tlie 

 hlood of various vertebrated animals; and although at lirst very much Ihiltened, they acquire, by suc- 

 tion, a very large size, and become swollen out hkc a bladder. Tliey arc round or oval. 



J.nxh's, Latr. iCi/Nnr/nrs-frx, Hrrni.), has tin- palpi easmii; the sinker, and Inrmin-, with it, a jiro- 

 jecrin- beak, truncated, ami sli;;lirly dilated at tlic tip. They arc fnund in thick woods, abouiulin,:,- 

 in brash-wond, briei's, &c., attaching thcmsehes to low plants 0\ tin; two bue-legs, extending the 

 other feet. They fasten upon dogs, cows, liorses, and other iiuadrniu'ds, and e\ m upon the tortoise, 

 IniryiiiK' their suckers so completely in their flesh that they can hardly be (letached by force, and by 

 tearing a\\ny the portion of skin to which they are fastened. They deposit a prodigious nnmber of 

 eggs, discharging them from the mouth, according to M. Chabrier,* Their multiplication upon the 

 ox and horse is sometimes so great that these animals jierish from exhaustion. The tarsi are terini- , ■ 

 nated by two ungues inserted upon a plate, f<r are iniifeil at the base upon a common peduncle. '1 b j 

 ancients a|ipear tn have known these animals under thi' name of Ricini. They are onr \u'!l-kiin\\ii 

 Ticks, — /.CM</e.y We//,./,., Linn., attacking the Pn- ; and /. . /■,'//e///,////,v, Latr., Falu'. (Jairi'.s rahiriux, ''|L,n,a,7ur,md 

 Schr.), tiie 0\. The latter, when swollen, is half an inch huig. The ;tudy of the species of this genus ll^,''^';,'""' '"■'*''" 

 is tnit suibr^iently advanrr'd. 



An/as, Latr. {li/ii/nc/ioju-ion, Herm.), dillers from Lxotles in the inferior situation of the month, and the palpi 

 not encasing the sucker, and being 4-jointed instead of three. A. reflexus, Fabr., Latr. Upon pigeons. A. per-sicus 

 (Malleh de Mianeh), described by travellers under the name of the Venomous liug of Miana, has been the subject 

 'if a curious meminr by M. Fischer de Wallrlheim. [This insect formed the subject of much discns.^ion at the 

 Liverpool meeting of the Ilritish Association]- 



[M. Andnuin has ilescribed and figured some species of the two preceding genera, and of those of Tetranyclnis 

 and Fteroptus, m the .(,///,//,,v ,/,-.v Sd. Nat. for 1832.] 



Otiier Mites i IfjidrachiieU.r', Latr.") have also eight legs, hut theyare ciliated, ami fitted foi- swimmiug. 

 They form the genns Jh/ilraclma of :\rnllcr (.//r/,c, Fahr.), and live oidy in the water. 'X\ni body is o\al 



• [TI.eniiiilorifiL'^ Uci.ii,' miuute, and c1...l' t.,, 0,,; ii.ouii,, Ims bcrn iiil,.e,Kfii fur Uic hiUcriii tM.^ ohsi rv.aioii.l 



