70 FAMILIES OF PETALOCERA WHICH FEED ON 



Articulo hasilari turhinato, parum elongato, septimo 



minimo paterifo7'mi ; 

 Capitulo o-phyllo elongato. 

 Labrum margine aittico coriaceo, corispicuo, brevissimo, 



scepius emarginato- 

 Mandibulae cornets, valida, subcompress(B, plerumque ex- 



sertcE, latere externa eminulo, sapim crenato aut 



dentate. 

 Maxilte cornea, ad apicem dentatce, latere interna inter- 



dam memhranaceo, ciliato. 

 Palpi maxillares, articulo ultimo subcrassiore. 

 Palpi labiales breves. 

 Mentuna pla?ium, subovatum, versus apicem panlo coarcta- 



tum, apice truncato, stspius emarginato, ad angulos 



dilatato. 

 Caput subtrigonmn aut suhquadratum, nunquamcornutum. 



Clypeus sutura vix distincta, margineque reflexo. 



Corpus subconvexum aut depressum, ovatum ; El^- 



tris abdomen postice hand occiiltantibus. Thorax 



transvei'so-quadratus ; Scutello semper distincto. 



Sternum antice productum. Pedes robusti, femO" 



ribus posticis interdum incrassatis ; tarsorum UU' 



guibus divisis aut indivisis. 



Observations. 



The Ru telidce are, on account of their structure and use 

 in connecting the other families, perhaps the most interest- 

 ing of the Petalocera. How great their affinity is to the 



eleven joints to the antenna, it will form a remarkable exception to the 

 rule followed in the structure of the rest of the family. But as Latreille 

 says that there are only ten joints, I have not thought proper to take any 

 potice of Olivier's opinion in the above general characters of the family. 



