THE LAMELIMCOl.'N P.EETLES. 99f> 



Tribe III. CETONIINI. 



In addition to the flattened form and prominent conical front 

 coxa?, the members of this tribe have the antenna? always 10-jointed; 

 sciitellum usually triangular and pointed; pygidium visible and 

 tarsal claws equal and simple. In some genera the side pieces or 

 epimera of the mesothorax are continued upward so as to form a 

 little piece which is easily seen at the shoulders between the thorax 

 and elytra. In flying, the true Cetonise do not raise the elytra, as 

 most beetles do, but the inner wings pass out from the side under 

 the elytra, which are a little narrower at the tips than the base and 

 do not at all embrace the sides of the body. The members of this 

 tribe differ from the other "leaf chafers" in being for the most 

 part flower beetles, the mouth organs being furnished with a brush 

 of hairs with which they collect the pollen. They are therefore 

 mostly diurnal, flying about from flower to flower during the heat 

 of the day. At night and in cloudy or rainy weather they are to be 

 found beneath bark or other cover. Seven of the nine genera com- 

 prising the tribe in North America are represented in the State. 



The following literature treats of three of these, the descriptions 

 of the species of the others being widely scattered: 



Horn. "Synopsis of the Euphoria? of the United States," in 

 Proc. Amer. Phil. Soc., XVIII, 1880, 397-408. 



Horn. 'Descriptions of New Coleoptera of the United States, 

 with Notes on Known Species," in Trans. Amer. Ent. Soc., 

 Ill, 1871. The genus Cremastochilus is treated on pp. 

 339-341. 



Horn. "A Monographic Revision of the Species of Cremasto- 

 chilus of the United States," in Proc. Amer. Phil. Soc., 

 XVIII, 1880, 382-397. 



Horn. "Revision of the United States Species of Oclioclceus 

 and other Genera of Scarabaeidse, " in Trans. Amer. Ent. 

 Soc., V, 1876. The genus Trichius is monographed on pp. 

 194-197. 



KEY TO INDIANA GENERA OF CETONIINI. 



(i. Side pieces or epimera of the mesothorax visible from above; elytra 



more or less sinuate on the sides behind the humeri. 

 l>. 'Phorax lobetl at the base, the lobe covering the scntellum ; head of 

 both sexes with a more or less distinct frontal and clypeal spine. 



XXXVI. COTINTS. 

 bl>. Scntellum not covered by a lobe of the thorax. 



