SCARABiEIDAE. 147 



is also found in South America ; of the others, P. truncatus in- 

 habits the Southern States, P. cribrosus .Texas, and P. Hiatus 

 California. 



Tribe III.— CETONIINI. 



In addition to the conical prominent anterior coxae, this tribe 

 is distinguished by the occurrence in it of certain peculiarities 

 not found at all, or only exceptionally, in the other tribes of 

 pleurosticti. 



In the majority of genera the mandibles are feebly developed, 

 and in great part membranous ; they and the labrum are always 

 under the clypeus; the antenna? are always 10-jointed, with 3- 

 jointed club ; the internal lobe of the maxilla? is obsolete ; the 

 elytra do not cover the pygidium, and the epipleura? are not 

 distinct ; the side pieces of the mesothorax are large, and ascend 

 between the thorax and base of the elytra so as to be usually 

 visible from above ; the last pair of spiracles is situated on the 

 suture between the connate fifth ventral and propygidium, but is 

 variable in position, being sometimes near the posterior margin, 

 sometimes near the anterior one ; the claws are always equal and 

 simple, with a distinct onychium, which, however, is very small 

 in Cremastochilus ; the ventral segments are six, not connate, 

 although very slightly movable ; the mesosternum is usually pro- 

 minent between the coxa? ; the side pieces of the metathorax are 

 variable in size, but the epimera are always visible. The genuine 

 Cetonia?, in flying, do not raise or expand the elytra, as most 

 Coleoptera do, but pass the wings out from the side, under the 

 elytra, which do not embrace at all the sides of the body. 



Both sub-tribes are found in our fauna. 



Epimera of the jnesothorax visible from above. Cetoniini. 



Epimera of the mesothorax not visible from above. Tkichiini. 



Sub-Tribe 1. — Cetoniini (genuini). 



The elytra in the genera here placed are always sinuate on the 

 side, and the mesosternum is almost always prominent; the epi- 

 mera of the mesothorax ascend between the prothorax and elytra, 

 and are visible from above. The foreign genera exhibit an intri- 

 cate network of affinities, which all the labor of Burmeister and 

 Lacordaire has failed to represent in a synoptic form ; our fauna 

 is so limited, however, that our groups may be thus defined : — 



