30 

 CORYLOPHID^. 



tllAUACTEKES DlAGNOSTICl. 



Aiiteniue articulis duobus basalibus semper magnis, primo maximo, recurvato ; 



fimiculo articulis 4-C comiiosito, quorum penultimus srepe incrassatus est; 



fliivii triarticuliita, vaUle incrassiita, plerumque subfoliatii. 

 I'lilpi maxiUiii-is -i-aiticulati, plerumque vaKle robusti, articulo secundo turgide 



incrassato, tertio brevissimo, transverso, quarto plerumque elongata, subcouico. 



In S<i(-io et Artlirolipside palpi maxillares magis elongati et graciliores articulos 



subiequales habent. 

 Palpi Idliitiles triarticulati articulo secundo plerumque maximo, sa?pe turgide 



incrassato, tertio forma variabili, B.fpe conico. In Socio et ArthroUpside 



articulns secundus latissime cyatbiformis est, atque tertius permagnus. 



obtusissimus. 

 Caput plerumque sub pronoto totum occultum, generibus paucis plus minusve 



exsertum, semper parvum ; oculis lenticulis ijaucis, sat magnis, compositis, 



srepe prominentibus. 

 Pronotnm parvum, margine anteriori plerumque integril, vel circulariter vel ovaliter 



rotundata, interdum ad caput accipieudum plus minusve excisum. 

 Venter segmento basali semper permagno ca;teris omnibus conjunctis plerumque 



a^quali. 

 Tarsi semper 4-articulati articulo tertio minuto. 

 Coxa anteriorrs fere contingentes, plus minusve liberse. 

 intermedite plus minusve distantes. 

 posteriores semper remotie. 



GENERAL CHAEACTEES. 



Body variously formed, elongate, more or less oval (Saciina) ; sbort, more or less 

 attenuated posteriorly (Sericodcrina) ; rounded (Orthoperina) ; or more or less 

 hemispheric {Corylophina). 



Head generally small, often completely covered by the pronotum, sometimes more 

 or less exposed ; eyes often large and prominent, with the facets large and few 

 in number. 



Anteniue very variable generically in the number of the joints, the two basal joints 

 always large, and the apical forming a much inerassated club ; sometimes one 

 or niore of the intermediate joints are enlarged, but all are generally short 

 and small. 



Palpi short and often very robust, ma.rillary four-jointed, and labial three-jointed. 

 Their most distinctive characters are the excessive enlargement of the second 

 joint of both labial and maxillary, and the small size and shortness of the 

 third joint of the maxillary ; the apical joint is generally slender and sub- 

 conical. In Saeiitm and Artlirolips the labial palpi are circularly rounded on 

 the outer side, the second joint being broadly cyathiform, and the third very 

 large and very broad. 



Lahniiit variable in size, generally ovally rounded, and often emarginate in front. 

 In Aiihaiiovejiliidiis the labrum is furnished with a semi-oval lamina attached to 

 the middle of its upper surface, and extending beyond its anterior margin. 



Mandihleii variable, generally very strong, and much rounded at the back, strongly 

 hooked at the apex, and often armed with long and sharp teeth. In liln/pobius 

 the mandibles are long and very slender, deeply bifid at the apex, with each 

 extremity terminated with a sharp hook. 



MaxilUe short, unilobed in all tribes, with the lobe long and strong ; armed at its 

 apes with sharp curved teeth. In lihypubiits and some other genera the inner 

 edge of the lobe is simple. 



