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Show 434 INSECTA. The second division, Goliathides, is distinguished from the preceding by the mentum, which is much longer, wider, and covers the maxillre. Here the mentum is concave in the middle, and in the form of a widened heart or of a transven,al square. The anterior extremity of the epistoma is neithet· dentate nor comute. The thorax has the form of a heart, tt·uncated at hoth ends and abt·uptly narrowed behind, or that of a tr·ansverse square, rounded latet·ally. The first joint of the antenure is very lar·gc, triangular, or in the form of a reversed cone. The palpi are short: the last joint of the maxillaries is elongated. The outer side of the two anterior tibire presents two teeth. PLA'.rYGENIA, Mac L. The body much flattened; thol'aX almost cordiform and widely truncated at both ends; maxillre terminated by a pencil of hairs, the internal lobe triangular and emarginate at the end; last joint of the palpi ovoido-cylindl'ical; mentum almost square, emarginated in the middle of its superior edge, and slightly on the sides; inner side of the posterior tibire denseir pilose( 1 ). In CREMASTOOHEILUS, l(noch, The thorax nearly forms a transversal square; the maxill~ are terminated by a strong hooked or falciform tooth, with setre or little spines in lieu of an inner lobe; the last joint of the pal pi is very long and cylindrical; and the mentum in the form of a widened heart, or of a reversed triangle, with its supe,rior angles rounded and without any sensible emargination(2). There, the mentum is in the form of a much widened heart, with· out a discoidal cavity, and its superior margin emarginate or sinu· ( 1) Hor. En tom., I, p. 151; Trichius barbatus, Schccnhert•, Synon. Insect., I, iii, App. 38. (2) Lat., Gener. Crust. ct lnsect., p. 121. M. Dupont, naturalist to the Duke of Orleans, whose collection of Coleop~erous Insects, next to that of Count J)e· jean, is the most extensive in Paris, has received from Lamana-.-French Guianaan Insect presenting all the essential characters of a Ct·emastocheilus, but in which the epimera or axillary pieces are more apparent when the animal is viewed from above. The anterior bbire are arcuatcd, and have a strong dentiform projection on the inner side. All the tarsi are short, thick, cylindrical, and terminated by two very long hooks. The anterior extremity of the epistoma is turned up in the · manner of an almost square bhde. The posterior extremity of the head presents an elevation divided into two teeth or tubercles. This Insect is about an inch long, black, with a red spot on each elytron. The Cetonia elongata, of Olivier, appears to be a Cremastocheilus. COLEOPTERA. 435 1'he antet·ior extremity of the epistoma, in the males, is t>US• divided into two lobes, in the form of tt·uncated ot· obtuse hot·ns. The thorax is neady orbicular. ' GoLIATH, Lam. Kirb.-Cetonia, Fab. Oliv. A subgenus which~ according to M. de Lamarck, is composed of Iargl' and beautiful species, some of which inhabit Africa and the East Indies, and the others, tropical America. Messrs Lepeletiet· and Serville-Encyc. M(\thod., article Scarabcides-have ~eparated the latter from it under the generic appellation of !NoA. The epimera is not prominent. The inner sides of the thighs of the two anterior legs at'e furnished at base with a tooth and an emargination. The middle of the superior margin of the mentum is strongly emar-. ginated; this part in the true Goliaths presents four lobes or teeth, two supcriot' and the two others lateral. The labial palpi are inserted on its edges in the emarginations of these latter lobes. All the known species are large; but M. Verreaux, Jun., the nephew and fellow traveller of the late Delalande, and who has returned to the Cape of Good Hope, has .lately sent us a species which is not larger than the C. gagates, which it also resembles in its colours, and which presents all the characters of a Goliath. The 0. geotrupina of M. Schrenherr is perhaps also congeneric. The thorax in Goliath is less roucd and pointed than in Inca. The anterior thighs are not dentated, and there is no emargination in the inner side of their tibire( I). In the third division of the Melitophili, a section cot'l'esponding to the family of the Oetoniidre, Mac Leay, the sternum is prolonged more or less into an obtuse point between the second pair of legs; the epimera or axillary piece is always apparent above, and occu· pies all the space that separates the posterior angles of the thorax from the base of the elytra; the thorax usually becomes widened posteriorly, and has the form of a triangle truncated anteriorly or at the point(2). The mentum is never t nsversal, and its superior (1) See Encyc. Method., art. Scarabei"des; the Hist. des Anim. sans verteb., l.am.;theObserv. Entom., WebeJ•,and Lin. Trans., XII, p. 407, where M. Kirby describes two species. There is an Insect in Java, that at a first gbnce appears to be a Goliath, and which Messrs Lepeletier and Serville have considered as such; but it has all the essential characters of a Cetonia; the thorax is merely rounded and nmowed posteriorly. The male has a bifurcated horn on the head. (2) Almost orbicular in some, as in the C. cruenta, Fab.; C. ventricosa, Schan· herr, &c. · 1M. Chevrolat, possessor of a splendid collection of Coleopter·a, among which are aevernl fl·om that of Olivier, has shown me a species found in Cuba by ~- Poe |
