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Show 350 IN!ECTA. RHIPIOERA, Lat. Kirby.-Ptyocerus, Hoff.-Polytomus, Dalm. The antennre flabelliform in both sexes, and composed of numer. ous joints crrom twenty to forty), but fewer in the females. This subgenus consists of five o1· six species, two of which are ft·om Ne\~ ~lolland, and th~ _remainder fl'om America(!). The three first JOints of the tarsi Ill the two following subgenera are in the form of a reversed heart, and have no membranous pro. longation underneath; the fourth is deeply bilobate; the last but slightly elongated, exhibits no projecting and silky appendag; be. tween its crotchets. The antennre a1·e filifonn, simple, 01• at most pectinated, and never consist of more than eleven joints. PTILODACTYLA, Illig.-Pyrochroa, De Geer. Distinguished by the semi-pectinated, or serrated antennce of the males. The species of this subgenus :u·e peculiar to America(2). DAsOILLus, Lat.-.!ltopa, Fab. Only differs fl'Om Ptilodactyla in the antennre, which are simple in both sexes(3). The remaining Cebrionites have small mandibles which project but little, or not at all, beyond the labrum, a generally soft and al· most hemispherical 01' ovoid body, and palpi terminating in a point. T~1e antennre are simple, or but slightly dentated. The posterior legs of several are fitted for leaping. They live on aquatic plants. In these, the penultimate joint of the tarsi is bilobate. The second and third of the antennre are shorter than the fourth. ELoDEs, Lat.-Cyphon, Fab. Dej. The posterior thighs differing but little in thickness from those of the preceding subgenus( 4 ). (1) Rhipicera marginata, Lat., Cuv., Regn. Anim. III; Kirby, Lin. Trans., XII, xxi, 3;-Polytomus mm·ginatus, Dnlm., Anal. Entom. p. 22;-P. fem(JT'atua, Id.Ib. 21:-P. mystacinus, Id. lb. 22; Hispa mystacina, Fab.; Drur. Ins. Ill, viii, 7. I have seen another species in the collection of Count Dejean, entirely fulvous, sent to him fl'Om America by Major Le Conte. (2) Ptylodactyla elaterina, Illig.; Pyrochroa nitida, De Geer, Ins., V, xiii, 6-17. (3) ./ltopa cervina, Fab.; .11. cinerea, var, Jd.; Ptinus testcu:eo-villosua, De Geer, IV, ix, 8; Cistela cervina, Oliv., Col., III, 54, 1, 2, a. (4) The first division of CYPJioN, Fab. COLEOPTERA. 351 SoYRTES, Lat.-Cyphon, Fab. Thighs of the posterior legs very large, and the tibire terminated by two stout spurs, one of which is very long, a circumstance which enables these Insects to leap. The labial palpi are forked, and the first joint of the posterior tarsi is as long as all the others taken to-gether( I). In those, all the joints of the tarsi are entire. NvoTEus, Lat.-Harnaxobium, Zieg.-Eucynetus, Schi.ip. The third joint of the antennct: very 5mall, and much shorter than the second and following one, the last almost granose; the four tibice terminated by two very distinct spurs; the tarsi long, and more slender towarcb the extremity(2). EuBRIA, Zieg. Dej. The antennre slightly serrated, the second joint very small, the two following ones largest of all, and the last somewhat cmarginate at the end, and tapering to a point; spurs of the tibire vet·y small, or nearly null; tarsi filiform( 3). The second tribe of the Malacodermi, or that of the LAMPYRIDES, is distinguished from the first by the enlarged termination of the pal pi, or at least those of the ·maxillre, by their always soft, straight, depressed, or but slightly convex body, and by the thorax, sometimes semicircular, and at others nearly square or trapezoidal, that projects over the head, which it either entirely or partially covers. The mandibles are usually small, and terminate in a slender, arcuated, very acute point, that is generally entire. The penultimate joint of the tarsi is always bilobate, and the crotchets of t~e last have neither dentations nor appendages. The females of some are apterous, or have but very Short elytra. When seized, these Insects press their feet and antennre against their body, and remain as motionless as if they were (l) The second division of Cyplwn, Fab. See the Catalogue, &c. of Dejean. (2) Eucynetus hremorrhoidalis, Germ., Faun. Insect. Europ. V, ii. See Catal., !te., Dej. ' (3) Cyplum. paluatris, Germ., lb. IV, 3. |
