614. INSECTA MADERENSIA. 



and elytra most delicately and closely granulated (but with scarcely any indication on the first 

 two of punctures intermixed, though a few very lightly impressed ones are just indicated on the 

 last) : the first less uneven than in the preceding species, with the anterior angles however raised 

 (though not prominent, nor with their lateral edges backwardly produced on to the forehead) ; 

 with the clypeus rounded in front (but a little less obtusely so than in that insect) ; and with a 

 deep though very short longitudinal fovea on either side of its hinder disk, in the base of which 

 the oceUi (which are small and picescent) are immersed : the second of the same form as that of 

 the O. ocellatum, but less uneven (or, rather, more regularly impressed), and with a deep longi- 

 tudinal fovea on either side of its hinder disk. Antenna ferruginous. Legs dull testaceous. 



Tlie exceedingly minute size and narrow, parallel outUnc of the present Omalimn, 

 in conjunction with its dark piceous hue (the limbs being alone pale), its closely 

 and delicately granulated (though scarcely punctured) surface, and the short, deep 

 and well-defined longitudinal fovea on either side of its hinder prothoracic disk, 

 Avill at once serve to distinguish it from evei*ything else with wliich we have here to 

 do. It is apparently extremely rare, — the only four specimens wliich I have seen 

 having been captured by myself from off the outer canvass of my tent (whither 

 they had flown towards the dusk of the evening), in the dense forest region of the 

 Lombo dos Peeegueiros, dimng July of 1850. 



(Subf. 8. PROTEINIDES.) 



Genus 212. MEGARTHRUS. (Tab. XIII. fig. 9.) 

 (Kirby) Steph. ///. Brit. Ent. v. 330 (1832). 



Corpus parvum, subovatum, subdepressum et dense pimctulatum : capite porrecto subtriangulari, 

 ocellis nidlis instructo ; oculis rotundatis prominulis : prothorace transverse, in medio profunde 

 canaliculato, ad latera leviter complanato, angulis posticis excavatis : scutello distincto, triangu- 

 lari : elytris pectore longioribus, angulo apieis exteriore rotundato : alis sat amphs : abdomin^ 

 breviusculo marginato. Antenna sub frontis margine laterali insertse, rectse, in medio graciles, 

 apicem versus leviter incrassatsc, articulis primo et secundo (illo prrecipuc) longiusculis robustis, 

 ultimo subgloboso. Labrum (XIII. 9 a) sub frontis margine reconditum, breve trausversum, 

 antice membrana (in typicis integi'A, sed in specie jMadcrensi) valde biloba auetum. Mandibula 

 (XIII. 9 b) parvae muticse, intus membranS, ciliata instructse. Maxilla (XIII. 9 c) bilobre : lobo 

 externa membranacco, apice (nccnon apicem versus exteriorem) dense barbato : inter-no vLx bre- 

 viore, extus subcorneo apice acuminato, intus vix ciliato. Palpi maxillares articulo primo 

 miuuto, secundo sat magno, tertio breviore, ultimo (in specie nostra) secundo longiore subgracili 

 fusiformi : labiates (XIII. 9 d) breves, articulis magnitudine leviter decrescentibus. Mentum 

 comeum, antice angustatum sed ad ajiicem truncatum. Ligula biloba ciliata ; pai-aglossis in 

 specie nostril (nisi fallor) ligulam baud superautibus. Pedes brcviusculi subtenues {intermedii 

 subapproximati) : tibiis muticis : tarsis (XIII. 9 e) 5-articulatis, articulis quatuor baseos brevibus 

 leviter decrescentibus, idtimo his conjunctis breviore. 



The insects of the present genus may be distinguished (apart from all other 

 characteristics) by the incised, or naiTowly excavated, hinder angles of their 



