58 FAMILIES OF PETALOCERA WHICH LIVE 



Maxillas lacmiis duahus suhaqualibus ; apicali membra- 

 nacea, Jungosd, margine supero extrorsum roturv- 

 data, interdum minore, processu interno crustaceo, 

 ohtuso. 



Palpi maxillares filiformes, labialibus Jere triplo longi- 

 ores ; 

 Articulo ultimo aim longiore, ovali-cylindricO} ad 

 basin paulo graciliore. 



Palpi labiales fere glabri, articulis suhglobosis ; 



Articulo tertio aut terminali aliis majore, orbicula- 

 to-ovali. 



Labium ininutum, membranaceum, sub-pilosum ; mento oc~ 

 cultatum, apice bijidum. 



Mentum crustaceum, subquadratum, versus apicem angus- 

 tius, margine antico emarginato. 



Caput subsemicirculare ; Clypeo sape tuberculato, nun- 

 quam dentate. Corpus ovatum aut ovale, ad api- 

 cem rotundatum, supra convexiusculum. Elytra 

 abdomen superne et ad latera obvolventia. Tho- 

 lax traiisverso-quadratus ; Scutello semper di- 

 stincto. Pedes validi, omnes <zque dissiti ; tibiis 

 anticis tridentatis, intus lined impressis pilisque 

 Jimbriatis. 



Observations. 



The Aphodiidcz differ from the Scarabccidce in having short 

 dilated coriaceous mandibles, and the pairs of feet at equal 

 distance from each other. They are also sufficiently sepa- 

 rated from the Trogida, in having their labrum concealed 

 under the clypeus, and by their mandibles being thin, 

 compressed, and scarcely to be called corneous. All the 

 insects known of this family have the scutellum distinct : 



