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Show 472 INSECTA. STRONGYLIUM, Kirb.-Stenochia, ejusd.-Helop8, Fab. Where• t•h e head is neither elongated nor narrowed posteriorly, an d the last JOmts of the antennre-somewhat more dilated-do not sud. denly differ from the preceding ones; the third is merely somewhat longer than the following one( 1 ). Those, in which the body is flattened, and the thorax narrowed posteriorly almost in the form of a truncated heart, compose the last subgenus, that of Prrno, Lat. Fab. Where the antennre hardly enlarge towards the extremity or are filiform, with the last joint almost conical; the third is hardly longer than the preceding and following ones. Certain species peculiar to Brazil closely approach Pytho; but the second joint is much shorter than the third, and the angles of the thorax are acute, instead of being rounded or obtuse as in that genus(2). The second tribe, that of the CISTELiDES, is very closely allied indeed to the first, but the insertion of the antennre is not covered, the mandibles terminate in an entire or unemarginate point and the hooks of the tarsi are pectinated inferiorly. Several of these Insects live on flowers. The diges. tive canal is shorter than in llelops, and the chylific ventricle presents no papillre. This tribe forms the genus CisTELA, Fab. In some, all the joints of the tarsi are entire. The last of the max-men of which I found near Brives, appears to me to approximate closely .to the Stenotracheles. The Pelmatopia Hummelii, Fisch.-Entom. Imp. Russ., II, nii, 7 -is, I presume, congeneric and closely approaches the first species. N.n. Pelmatopus. M. Fischer, who at first thus designated this genus in his plates, has, in the text, adopted the name of ScoTODEs, previously given to it by M. Eschscholtz. (1) 8trongylium chalconatum, Kirb., Lin. Trans., XII, xxi, 16;-Stenochia rofi? es, lb., xxii, 5. See also the Helops splendidus, aurichalceus, azureus, interstitia· lUJ,.ftavicrus, luteicornis, limbatus, of Germar. (2) See Fab., System. Eleuth., II, p. 95; Lat. Gener. Crust. et Insect., II, P· 195; Schrenh., Synon. Insect., f, iii, p. 55; Frisch., Entom. Imp. Uuss., 11, xxii, 1. COLEOPTERA. 473 illary palpi is merely somewhat larger, and ol>conical or trian-gular. . • Here the thorax 1s thtck, narrower than the abdomen and almost orbicular or nearly cordiform. The antennre thicker ~t the extremity and the thighs clava.te. LYSTRONIOHus, Lat.(l) There the thorax is depressed, trapezoidal, and its posterior mat·gin is as wide as the abdomen, or hardly narrower. The antennre are filiform or slightly enlarged towards the extremity. In CisTELA, Fab. Or Cistela properly so called, the head projects in the manner of a snout, and the labrum is hardly wider than it is long; most of the joints of' the antennre either obconica], triangular, or even serrated; the last is always oblong. The body is ovoid or bordering on an oval. C. ceramboides; Chrysomela ceramboides, L.; Oliv., Col. III, 54, 1, 4. This species, on account of its antennre, of which the three first joints are shorter than the fo11owing ones, and of the serrated form of the lattet·, might constitute a separate subgenus. It is five lines in length; black; elytra reddish and striated; thorax almost semicircular. The larva inhabits the tan of old Oaks, where it undergoes its metamorphosis. C. sulphurea; Chrysomela sulphurea, L.; Oliv ., lb., I, 6. A more elongated form than that of the ceramboides; length four lines; lemon-yellow; eyes black; elytra striate; antennre simple. Very common on different flowers, those of the Yarrow particularly( 2). MvoETOOHAREs, Lat-Mycetophila, Gyll. Dej.-Cistela, Fab. Where the head does not project in the manner of a snout; where the labrum is very short, transversal and linear, and where most of the joints of the antennre are short and nearly turbiniform; the last is ovoid. The body, particularly in the males, is nart·ow and elongated. The maxillre and the labium are soft(3). In the otheri, the penultimate joint or the tarsi is. bilobate, and {1) Helopa eque~tria, Fab., and some others from Brazil;-Helopa columbianua, Germ. ;-Notoxus helvolus, Dalm. (2) See Lat., Gener. Crust. et Insect., 11, p. 225; Oliv., Col., lb.; Schcenh., Synon. Insect. I, ii, p. 332, et seq. (3) See Gyllenh ., Insect. Suec., I, ii, p. 451; Lat., Gener. Crust. et Insect, II, P· 189, Helopa ba'l'batm. The name of Mycetophila having been employed by M. Meigen, I have thought it necessary to give a substitute in Mycetochares. · v OL. III.-3 K |
