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Show 514 INSECTA. BosTRicnus. In BosTaioHus, Geotf.--Apate, Synodendron, Fab.-Dermestes, Lin. Ot· Bostrichus proper, the body is more ot· less cylindrical, the head rounded, almost globular, and capable of being received into the thorax as far as the eyes; the thorax is more or less convex be. fore, and forms a sort of hood; the two first joints of the tarsi 1 as well as the last, are elongated. B. capucinus; Dermestes capucinus, L., Oliv., Col. IV, 77,i,l. Five lines in length, with a red abdomen and elytra of the same colour. Very common in old wood in timber yards(!). PsoA, Fab. The Psore only differ from the Bostrichi in their proportionally narrower and more elongated body, with a depressed and almost square thorax. The maxillre have but one lobe instead of t1Vo(2). C1s, Lat.-Anobium, Fab. Where the body is oval, depressed, or but little elevated, the tho· rax transversal, rounded, and with a recurvecllateral margin, slightly dilated in the middle of the anterior edge; the last joint of the tarsi is much longer than the preceding ones. The head of the males is frequently tuberculated or fut·nishecl with horns. These Insects inhabit the fungi of trees(3). In NEMOSOMA, Desmar.-Jps, Oliv. - Colydium, Hellw. The body is long and linear; the antennre are hardly longer than the head; the mandibles are strong, salient and dentated at the ex· tremity; the anteriot· tibire are triangular and dentated exteriorly, and the tarsi slender and elongated( 4 ). The second genus of this division, or ( 1) For the other species, see Olivier, Fabricius, &c. (2) See l<'abricius and Rossi. (3) Lat., Gener. Crust. et Insect., III, p. 11, and Gyll., Insect. Suec., III, P· 377, and IV, p. 624. I have seen but a single and badly preserved specimen of the Sphindus Gyllenhaltii: it appeared to me that this genus differed but little from the present one. (4) Lat., Gener Crust. et Insect., III, p. 12, and I, xi, 4. COLEOPTBILL 515 MoNoToMA, Is distinguished from the first by the solid and globuliform clubthe tenth joint-of the antennre. The body is elongated, depressed, and frequently forms a paralJelopiped; the anteriot· pat·t of the head is narrowed, and projects somewhat in the manner of a triangular and obtuse snout. The palpi are very small, and, afwell as the mandibles~ not salient. In some, the head is not separated from the thorax by a strangu· !ation or sort of neck, and can be received into it. SYNOHITA, Hellw. Dej.-Lyctus, Elophorus, Fab. Where the anterior extremity of the head is transverse and without any prolongation, where the two first joints of the antennre are almost identical, and where the thorax, much widet· than it is long, is separated fl'om the base of the elytra by an evident interval(!). CERYLON, Lat.-Synchita, Hellw.-Lyctus, Fab. Where the anterior extremity of the head projects in the manner of an obtuse triangle; the first joint of the antennre is much larger than the second; the thorax is applied posteriorly to the base of the elytra, is wider than it is long, or almost isometrical, and without any recurvature of the margin. The body is almost oval or nearly forms a parallelopiped, and the elytra are truncated posteriorly and cover the whole top of the abdomen(2). RHYZOPHAGus, Herbst. Gyll.-Lyctus, Fab. Resembling the preceding in the head, the relative dimensions of the first joints of the antennre, and the junction of the thorax with the abdomen; but the body is narrow and elongated, the thorax wider than long, with a recurved margin; the elytra are truncated posteriorly. Some authors have asserted, that by theit· tarsi, they are Heteromerous-! rathet· think they pt·ove them to be Pentamerous( 3). The others, (1) Oerylon terebram, Lat.; C.juglandis, Gyll.; Lyctuajuglandia, Fab.; Eloplw· rt11 humeralis, Ejusd. (2) Oerylon histeraidea, Lat., Gyllenhall. (3) See Gyll., Insect. Suec., 1, iii, p. 419. |
