189 ORDF.R MOMOrrCBA- 



Iii thr eighth Volume of thr Enryclopir-dia Atuprirnnji, Dr. TIariiu has tlpMril>r<l the 

 Irafhoplirr, Trtti^onia vilis. It l!i aUiiit thr trnlh <>r tin inch lone. an<i arrirr« nt nir.turity 

 in Uic month of AiifOi^t : It W of a pale strnwcolor, ami inh»l<it» l>oth thr naiivi- ntifl 

 fon-lifn cralx* vine*, ami, in mnip wnMns, is »«> nunirrou.* as l<» affrrt mt|ou.«I_v i! • 

 ami fruit. Thry aillirn- to thi- nmlrwid*' of the leaves, an«l lienee the renii<l> pr 

 whieh consists in funili;ation with toluieeo, will Ik> more etfertual than if they inliat>ite«i 

 the upjK'r side. For the purptm- of fumij^ition, the vine or its trellis »houl<i !>«• covered 

 with a tent, an»l the pnicess may lx> iK'n(i>teil in until the insect is thurouoihly routed or 

 destrr>ye<l . 



Riisehushes sometimes l>ecomc infeste<i with a kind uf Ieafhop]>er, the Tettipmia rota, 

 which may l>e tn>ated iti the sjinie way. 



As the lns«'cts of this family hr>i> briskly, they cannot be dish-ilci-d fmm the vines by 

 shakinc, nor is it praetirablf to catch them : it hence l>ecomes necessary to destn-y th< m 

 by fumi);ation, or by the a]>plication to the leaves and vines of some sub>tance destructive 

 to the Insects, but which will not injure the plant. Whale-oil soap in solution l« another 

 remedy whose application has l>een followetl with success. 



As thes<> insects take refuge among the fallen leaves and underlying gras5, where they 

 survive the winter, the leavers and cni.ss >hould Ik- can-fully removed an<l burne<l. either 

 after the weather hiis become c<»ld in the autumn, or in the sprinK l>efor«- V(*getatii>n ha,s 

 put forth. All thj-se methods should be resorted to, where vines suffer from too great an 

 aliuii.l;ii»r«- of thes«' insects. 



AiiliitliMae. 



The APHIDIAN.H ( plant-lice) are a group of in.sects with soft l^Klies of an oval form, and 

 furui.sheil posteriorly with two tufts or i>ores. The lemales are generally wingless, though 

 not always. The upper pair, answering to the wing-covers in the Hi^iirTEjLA proj«r, arc 

 larger, and are used fur the purfxise of flight, or to n.s$ist in leaping. 



Tlie leaping plant-lice belong to the Genus Psylla : the young are covered with a 

 cottony substance, and are found ujion the alder and s<'me other plants in the spring. 



The genus to which the name Arms has been given, from which the name of the family 

 is derivcfl, and which signifies to exhaust, is one of the most remarkable in the class of 

 insects : feeble and entirely unprotected, the insect is crushed by a touch, or swept away 

 by a breatli. It is, however, provided w*ith the means of increase to an immense extent ; 

 and, hence, in conse<juence of this extrnordinar}- power, in virtue of its numbers alone it 

 is competent to inlliet the most s<'rious injury ujNin the |>lanls it inhabits. Most plants are 

 Infe^tted with them ; and each i>articular kind of plant, shrub and tree. sup|N>rts its own 

 p«'culiar sp»«l««, ihou::h it dcK-s not swrn to In- j^ruved that the juices of many plants may 



