162 URDr.R IIO.MOPTKRA. 



moving the plant llr« are l>y no iiii-ann Inmnsldernblc. Ue niiftht, indeed, ndvanlaKrcnBly 

 •tiK-k IiIh Ii<iium< plaiil!! with the focrinrlta, ftir thi* |>urtMi44< of krrplne thrlii rlrar >•( lire. 



I hiivr* iilri'ttkiy niiviTtf')! !■> the lurcwiiig : in il<* luna >lali'. It i^ pnWuilily oiir or the 

 m'41 «ani;itinnn rncmli-^ of |>lniitlirr. \\ lien* th)-M« uImiuu)!, the t-sc^of tlie larcninc may 

 >te M-<'n rarli Mi{>|><irt(-«l <*n the ciKlofn ^l(■Iu^■r ihrtad/riu' larva or criili is pruvidtd with 

 a larci' pair of nirvcd |Milntfd li<>l|>iw jiiU!<. with whirh he M-izr4 the aphis, aad sucks all 

 the tliild rontvnt.t of Its ImhIv, Icuvinft iiothini; hut a rullap<t«-<l skin. 



Mr. KiRiv states the fart, which is also nuw m-ll known to many, that a fly IjclonKtng 

 to the Genus Syrpiu s is (>(|ually ctlV-rtivr in cxtrruiinntins the aphis; their lar\ip or 

 mnKi;o|H ImvinK completely exterminated a colony which hud a wii-k U-forr infested his 

 current- hushes. 



C'Dnldac. 



Tiif. DARK-Lict: fonu a thinl division of siiimilar insects, fr*>m which, judging fn^m the 

 appearance of a lew imlividiiaLs nuiont; them, we ^lu>uld never ex|>ecl H-rioiis injur)' to 

 lre«'.x or phinls. They vary in form : sometimes they are kidney -shaiK-d .valis, Uiieath 

 which, at st^iiue i)eri<xi ur other, may lx> found a brood of minute lice : others ore oval, 

 quite large and globular, of a dark gray coK>r, and are fixed to the surface of the bark, or 

 have h'St the iK)wer of locomotion ; these are females. 



As an illustration of the character of the ('occiJ<r, I may state tliat the matter of the 

 cfKhiueal of commerce, l)rought to us fn-m .Mexico, is an insect of this family. 



ThcM? insects are usually known under the name of barklice, of which the kind that 

 Inhabits llie l>rnnrhes of tlu- appietre<' is prol>al)ly the most common. They difli'r in struc- 

 ture from the aphides, their feel consisting of a single joint terminating in a claw. The 

 male is quite small in comparison with the female, and, like that of the aphis, is provided 

 with wings, which are two in niuul)cr, and lie flat u^Mtn the Ixnly as in the Genus Tiiairs. 

 The female, after she luis In-come flxeil to the limb or Iwrk of the trtn*. having lost the 

 power of l.K-oniolion, luings forth lK>neatli her a brtxxi of young, which, when able to run 

 about, escaiM- fnjm the dry skin of the parent, and tix themselves by their Uaks to the 

 bark, where th«'y grow ami Inrome mature ufxm the sap of the tn-e. 



A maple at my door in Hudsou-street, Albany, is infested with thousands of individuals 

 of a species of Cofcus, about the twentieth of an inch in length, and covered w ith the 

 woolly matter jx-culiar to the family, which imparts to the limbs a snowy ap{H>arance. On 

 the first of September, the back of the leaf supiwrts Si>me twenty individual females of a 

 gn-en color, Uneath which are the young. 



Tn-es suffiT from the minute punctures of Imrk-lice ; theajiple-tree particularly, which 

 is iulVstcHl with a kind tliat rtMniMes a dry scale, liavim; the dlor of tlie cuticle of the 

 bark on which it rests The remedies for these depredators are the same as have be«n t« 



