Character Generic us. Antenna: capitatee, capitulo subarcuato, ob-conicoovato, vel elongatoobovato. Palpi brevissimi clypeum vix attingentes. ad faciem appressi, non prominuli, articulis duobus primis subseque longis, tertio minimo subobsoleto. Pedes in utroque sexu conformes, ambulatorii, unguibus distinctis simplicibus instructis, anticis nee minutis, nee spurns. Ala antica saepius subfalcatae ; postica scepe caudata?, margine interno pro abdomine libero vel excisd vel plicato, abdomen in canali siibtus non excipiente marginibus externo et anali dentatis. Larva tentaculata, carnosa, furcata. Pupa angulata, antice bimucronala, filo trans verso in medio alligata. BUTTERFLY. Generic Character. Antenncr, at their point?, furnished with a conic-ovate or lengthened-obovate somewhat arcuate club. Palpi very short, pressed close to the face, and scarcely reaching the clypeus ; the two first joints of equal length, the third minute and nearly obsolete. Feet in both sexes alike, and formed for walking, with distinct simple claws, the anterior pair like the others in structure and size.
Antennce exteriores corpore longiores segmento tertio articidis elongatis cylindricis. Fedipalpi gemmi externi caulis interni articulo secundo primo multo breviore ad apicem internum truncato-subemarginato. Pedum par anticum maris corpore paululum longius manu compressa ; paria alia tarsis tibiis duplo brevioribus, unguibus acutis, flexuosis longitudinaliter sulcatis. Abdomen maris articulo primo transverso arcuato, linear!, secundo paululum longiore antice arcuato-subproducto, tertio valde elongato apicem versus paululum angustiore apice subemarginato, quarto subquadrato apice subemarginato,
I H A V E the pleasure of communicating to the Linnean Society the characters of five genera of the natural family of Rats which have not hitherto been observed by naturalists ; apd I add the distinguishing marks of VAMPY nus, a genus lately indicated, but no where characterized, by my friend the Chevalier Geoffroy St. Hillaire, who in a former paper, to which he has referred, had neither described nor figured the posterior molari.~ of the upper jaw*. The details of MEGADERMA G e o f. are also given, not only for the purpose of showing the characters of its grinding teeth and its affinity with NYCTOPHILUS, but to prove that the characters which Cuvier has attributed to that genus, with some degree of doubt, are perfectly correct (R 2 g n e Anim. i. 127.), namely, the absence oE the superior incisors. On a future occasion it is my intention to lay before the Society the details of all such new genera as may be discovered by my friends in different parts of the world, which shall be followed with descriptions of all the species.
Pedes 2 antici didactyli. Pedes parium 2 , 3 , 4 et 5 consimiles, grades. Oculi nudi haud retractiles. Rostro fisso. 28. MACROPODIA. Rostro integro. 29. LEITOPODIA. DIVISIO VII. Pedurn par quintum minuturn, spurium. 30. LITHODES. D. Abdomen fcernina: (marisque ?) 5-arliculutum. (Testa antice ro-31. PACTOLUS. strata.) E. Abdomen in utroque s e m 4-articulatum. Pedes 2 antici didactyli. Testa rotundata aut subrhomboidalis. Testa transversissirna, cylindrica. 32. LEUCOSIA. 33. IXA. D I V I S I O I. Abdomen M A R I S 5-articulatum articulo riredio longiore ; r a % f I N z 7-articulatum. Testa rhomboidalis. Anteniice ex teriorcs simplices. Pedipalpi gemini externi caulis interni articulo secundo latere interno emarginato pro insertione palporum. Pedes duo antici didactyli longissimi ; digitis deflexis ; pedes alii siinplices, consimiles.
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