OCR Text |
Show 560 INSECTA. GALERUCA, Which we will divide into two principal sections; those which are destitute of the power of leaping or the lsopoda, and the Jumpers or the Anisopoda. Some species foreign to Europe, in which the penultimate joint of the maxillary palpi is dilated, and the last much shorter and tt·uncated, form the genus Anon.ruM, Fab.-Oides, Web.(l) Those, in which the two last joints of the maxillat·y palpi di~er b t l'ttle as to size and in which the antennre, composed of cyhn-u l ' b d' . . drical joints, are at least as long as the body, have een tstmgutshed by the generic name of LuPEn.us, Geoff.(2) The others, which, with similarly terminated palpi, have shorter antennre com Posed Of ohconical J. oints, fot·m the true Gallerucre or the GALEn.uoA, Geoff. Such are the G. calmariensis; Chrysomela calmariensis, L.; Oliv ·~Col., VI, 93 ' 1..1.1 , ."> 7 • Three lines in lenri:)r th; yellowish or greemsh above; three black spots on the thorax; another. with a stripe .of t~e same colour on each elytron.-This spectes, together wtth Its larva, is found on the Elm; in certain seasons when unusually abundant, it strips these trees of their foliage, and does as much mischief as certain caterpillars. G. tanaceti; Chrysomela tanaceti, L.; Oliv., lb., I, 1. Oval, oblong, ~ery black and but slightly glossy; elytra deeply punc· tured and without strire. On Tansy(3). The jumping Galerucitre,or those whose posterior thighs areinflateu and which are distributed by Fabricius among the genet·.a Chrysom~la, Galeruca and Crioceris, are united in one, that of .!llt·wa ot· Haltua, in the systems of Geoffroy, Olivier and Illiger. These Insects are (1) Web., Observ. Entom.; Lat., Gen. Crust. et Insect., III, P· 60, and I, xi, 9; Oliv., Col., V, 92, his; Schrenh., Ib., II, p. 230; Fab., Syst. Eleut. Nov (2) Oliv., Co]. IV, 75, bis; Schrenh., lb., p. 292, 294; Germ., Insect. Spec. ., p. 598. (3) See Oliv., Col., lb. COLEOPTf~HA, 561 very small, but are ornamented with various or b •'JI' • • • 11 tant colours; they JUmp with gt·eat qutckness and to a ve1·y great 1 • 1 d f 1e1g 1t, an requently destroy the leaves of those plants on which they feed. Their Iat·vre devour the parenchyma, and there undergo tl · . . . 1cu· metamor-phosiS. Certam spectes, those particularly which d jl . . . . are commonly termed gar en eas, a1·e .very InJunous tn both states to our kitchen gat·dens. Of all countt'Ies, South America furnishe th . . . . s e greatest number. Ilhger, tn hts Entomological Magazine, has published an excellent Monograph of these Insects which he arrang · · ' es 111 mne families, and some of which, in our opinion should ~'o subgenera. Those of the subgenus ' ,, rm separate OoTOGONOTEs, Drap.( 1) Are removed from all others by the form of their maxillary 1 · A · Ad · th ] · · · · , pa P1• s tn oriUm, e penu ttmate JOint Is thick and turbinifo1·m, and the last very short and truncated; the termination of the labial pal i is acuminate or subulate, as in all the following subgenera· but he~e the maxillaries are similal'ly formed, or at·e also subulat~ at their extremity. The last joint of the posterior tarsi of the Octogonotes is abruptly inflated and rounded above, or ampullaceous, with the two terminal hooks inferior and small. CEntONYOHis, Lat. Is distinguis~ed by this last character from the following subgenera. To th1s subgenus we refer the two first families of Illiger's Monograph. But a single species is found in Europe-the .11. marginella, Oliv., Col., VI, 93, bis, ii, 34-and even that is confined to Spain and Portugal(2). In the remaining subgenera the last joint of the tarsi is elongated and gradually thickened, with the two hooks, of the ordinary size, situated as usual at its extremity, and in a longitudinal direction. PsYLLIODEs, Lat. Where the first joint of the posterior tarsi is very long and inserted above the posterior extremity of the tibire; this extremity is prolonged in the manner of a conical, compressed, and hollow appen- (1) Ann. des Sc. Phys., III, p. 181. (2) Add the .11.. hicolor, thoracica, cincta, albicollu, lunata, and some other species of Olivier. VoL. 111.-3 V |