OCR Text |
Show 558 INSECTA. In the two following subgenera the same joint, also well s'cparatell from the preceding one, and quite as large or larger~ is more or less semi-ovoid. These Insects are more abundantly disseminated throughout the eastern continent, and Europe in particular. TIMAROHA, Meg. Dej. The Timarchre, which were formerly placed among the Chrys0• melre, comprise those which are apterous. Their body is gibbous, the antennre are granose, infet·iorly in particular, the elytra united, and the tarsi usually much dilated, at least in the ~1ales. These Chrysomelinre are found on the ground m the woods, on grass, and along the edges of roads. Their gai.t is sl.ow, and they emit a yellowish or reddish humour from the arttculatwns of their legs. They are most common in the south of Europe and north of Africa. Among those in which the thorax is nan·owecl posteriorly and approaches to the form of a crescent, and genet·ally the largest species, is placed, T. lrevigata; Tcnebrio lrevigatus, L.; Oliv., Col., V, 91, i, 11. From four to eight lines in length; black; thorax and elytra smooth, but finely punctured; antennre and legs violet. Its larva is greenish or violet, strongly inflated, and has a fulvous extremity. It feeds on the yellow Gallium, and under· goes its metamorphosis in the earth( 1). CnnYSOMELA proper. This subgenus will comprise such of Olivier's species as are fur· nished with wings, and in which the maxillary palpi, .a~cording to our p1·eviously established subdivisions, have the last JOint as large as the preceding ones or larger, and in the form of a truncated, ovoid, or reversed cone. Such are C. sanguinolenta, L.; Oliv., lb., I, 8. About f~ur lines in length· black or bluish-black; sides of the thorax thtckened and punctu' red; el' ytra deeply punctured and widely emargm. ate d ex· tcriorly with red. Found on the ground in fields, and along the borders of roads. C. cerealis, L.; Oliv., lb., VIl, 104. Size of the preceding; cupreous-red above with longitudinal, blue streaks, three on the thorax and seven on the elytra. Common in France. (1) Add the following species of Olivier. rttgosa, scabra, latipes, corim·ia, .g~t· lingensis. See also the Catalogue, &c., of Count DeJ· e:m: b u t as 1 only d1·s lm· guish the Timarcha: from the Chrysomela: by the absence of w·m gs, I am not sure that all the species he mentions are in this case. COLEOl'TElL\. C. populi, L.; Oliv., I b. VII 110 L 1 f . ' ' · cngt 1 rom five to six hnes; oval, oblong, and blue· clytt·a fulvo d . . . ' us or re ' and the mner angle of the11· extremity marked with a bl k 1 0 . ac cot. n the '\Vii-. l ow an.d Poplar; Hs larva. lives on the. same t rec,s , an d f rcquently 10 SOCiety. , This specits, and some others equally obl ong, W·l th a thorax na.r rower than th.e elytra, an<.! fot·ming a t rans.v ersa1 square W tluc.k 11 ened ~n the s 1 I_des,.constitute the genus Lima of Megerle(l). . e w1 .t erm mate t llS tnbe with those Chrysom· el'm re w h ose max- Illary pa·l p11 are attenuated at the extremity and termin t d · · ~' a e m a pom t. They w1l 10rm two subgenera. Pnlf!.DON,-Colaphus, Meg. Where the body is ovoid or orbicular(2), and PnAsoounxs, Lat.-Helodes, Fab. Where the body is narrower, more elongated and almost a paral~ elopiped, and w~ere .t~e diameters of the thorax arc nearly equal. fhe four or five .ast JOints of the antennre are dilated, and almost form a club(3). In the third and last tribe of the Cyclica, that of the GALERUCIT 1E, we find antennre always at least as long as the half of the body, of equal thickness throughout, or insensibly thicker. towar.ds their extremity, inserted between the eyes, at but httle distance from the mouth, and usually approxi· mated at base, and near a small longitudinal carina. The maxillary palpi, thickest about the middle, terminate in two joints, in the form of a cone, but opposed or united at base, the last short, and either truncated or obtuse or pointed. The body is sometimes ovoid or oval, and sometimes almost hemispherical. In several, and particularly the smaller species, the posterior thighs are very stout, which enables them to leap. This tribe is composed of the genus (1) See the Catalogue, &c., of Dahl. (2) See the Catalogue of Dahl, but add to it certain Chrysomela:, such as the following: raphani, vitellinllJ, polygoni, &c. The antenna: of the species called armaracillJ, cochlearillJ, in the thickening of their terminal extremity, closely approach those of the Helodes. (3) See Lat., Gener. Crust. et Insect., III, p. 57, Fabricius, Olivier, Schrenherr, and Gyllenhall. To the species quoted, add the aucta, marginella, hannaverana. |