171 



This beautiful and conspicuous insect resembles the species of Corylophus in 

 the general form, and in the smooth and highly polished surface of its body, and 

 also in the disposition of its bright crimson markings, which on the elytra are more 

 or less suffused, leaving only the margins and suture black. C Bowriiuiii is subject 

 to much variation in both size and colour, some examples exhibiting the beautiful 

 markings described above, and some being of an almost uniform castaneous colour, 

 and of a smaller size ; but, as there is no sculptural difference between these forms, 

 the latter are probably the females, and the former the males of the same species. 



Tribe V. — Orthoperina. 



In this tribe the head is always more or less visible from above, and in no case 

 entirely covered by the pronotum. This character distinguishes the Orthoperina 

 from every other tribe except the Phanerocephalina ; from this they differ con- 

 spicuously in the subhemispheric shape, and shining surface of their whole body. 



The two genera at present known are distinguished from each other by the 

 number of joints in their anteunte, besides many anatomical differences. 



Autenuffi 11-articulata? ... ... ... ... ... Rhypobius. 



,, 9-articulatfe Orthoperus. 



RHYPOBIUS. Pl. YL, C. 



Ixliypohins, Le Conte, Proc. Ac. Nat. Sci. Philad. vi. 141, 1852. 



MoroniUiis, Duval, Ann. Soc. Ent. Fr. 1854, Bull. p. 38 ; Gen. Col. Eur. p. 236, 1859. 



Gla'osoma, Wollaston, Ins Mad. p. 480, 1854. 



Corpus plerumque ovatum, validissime convexum. 



Caput parum essertum, sat magnum ; oculis plerumque prominentibus ; antenuis 



prope oculos insertis. 

 Anteiuue (PI. VI., C, fig. 7) ll-articulatte, geniculate ; 1 permagno, pyriformi, 



apicem versus valde iucrassato ; 2 primo dimidio minori, intus ovate incrassato; 



3 secundo multo breviori, gracili ; 4-6 transversis, gradatim brevioribus ; 7 

 permagno, quatuor prsecedentibus longitudine lequali, intus valde incrassato ; 8 

 minuto ; 9-11 permagnis, clavam foliatam formautibus, ajjicali, prscedenti 

 duplo majori, ovali ; 7, 9, 10 et 11 setis interne instructis. 



Palpi maxillarcs iPl. YI., C, fig. 5, w) permagui, 4-articulati ; 1 exiguo, triangulari ; 

 2 permagno, valde incrassato, basim versus latissimo; 3 perbrevi, transverso; 



4 tertio lougiori, fere semiovali, setis brevibus instructo. 



Palpi lahiales (PI. YL, C, fig. 6, m) magni, subovati, 3-articulati ; 1 exiguo; 2 



magno, semiovato, recte truucato ; 3 secundo multo breviori, transverso, apice 



truncato et setis brevissimis instructo. 

 Lahrum (PI. VI. , C, fig. 3) minutum, perbreve, antice ovaliter rotuudatum. 

 Mandihulie (PI. VI., C, fig. 4) tenues, elougatae, fere lineares, ad apicem profuude 



bifida), apice utroque ungue acuto terminato. Stipes parvus. 

 Ma.cilUe (PI. VI., C, fig. 5) modicBe, unilobatas, lobo simplici, cultriformi, apice 



acutissimo. Stipes parvus. 

 Mentum (PI. YL, C, tig. 6, j; parvum, transversum, ad basim latissimum, lateribus 



leviter rotundatis. 

 Labium (PI. YL, C, fig. 6, k) parvum, transversum, antice latissimum, lateribus 



rotundatis. 

 Lingua (PI. YL, C, fig. 6, 1) modica, triangularis, pone palpos ferme occulta. 

 Pronotum sat magnum, margiue auteriori antice leviter excisa, angixlis posterioribus 



haud productis. 



