70 FAMILIES OF PETALOCERA WHICH FEED ON 



Articulo basilari turbinate, parum elongato, septimo 



minimo pateriformi ; 

 Capitulo o-phyllo elongato. 

 Labrum margine antico coriaceo, conspkuo, brevissimo, 



sapius emarginato- 

 Mandibular cornea, valida, subcompressa, plerumque ex- 



serta, latere externo eminulo, sapiu$ crenato aut 



deniato. 

 Maxillae cornea, ad apicem dentata, latere interno inter- 



dum membranaceo, ciliato. 

 Palpi maxillares, articulo ultimo subcrassiore. 

 Palpi labiales breves. 

 Mentumplanum, subovatum, versus apicem paulo coarcta- 



tum, apice truncato, sapius emarginato, ad angulos 



dilatato. 

 Caput subtrigonum aut subquadratum, nunquamcornutum. 



Clypeus suturd vix distincta, margineque reflexo. 



Corpus subconvexwn aut depressum, ovatum ; Ely- 



tris abdomen postice hand occult antibus. Thorax 



transverso-quadratus ; Scutello semper distincta. 



Sternum antice productum. Pedes robusti, fenvo- 



ribus posticis interdum incrassatis ; tarsorum un~ 



guibus divisis aut indivisis. 



Observations. 



The Rutelida 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 

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



