ORDER COLEOPTERA. 493 



Platygenia, Macl. 



Their body is v'ery much flatted, with the corslet almost 

 in the form of a heart, broadly truncated at the two ends ; 

 the jaws terminated by a bundle of hairs, and the internal 

 lobe of which is triangular, emarginated at the end ; the last 

 articulation of the palpi is ovoid-cylindrical ; the chin almost 

 squared, emarginate at the middle of the superior edge, and 

 a little upon the sides, and the posterior legs very hairy at 

 the internal side.* 



Cremastocheilus, Knoch., 



Whose corslet is almost in the form of a transverse square ; 

 whose jaws are terminated by a strong tooth, crooked or 

 scythe-like, with silken hairs or small spines at the place of the 

 internal lobe, which have the last articulation of the palpi 

 very long and cylindrical, and the mentum in the form of a 

 widened heart, or a reversed triangle, and rounded at the 

 upper angles, without any sensible emargination.-f* 



* Macl. Hor. Entom. I. part I. p. 151 ; Trichius barbatiis, Schcenh. 

 Synon. Insect. I. iii. App. 58. 



f Latr. Gener. Crust, et Insect, p. 121. M. Dupont, naturalist to his 

 Highness the Duke of Orleans, and whose collection of coleopterous 

 insects is, after that of M. Dejean, the richest in Paris, has received from 

 Lamana (French Guiana), an insect presenting all the essential characters 

 of Cremastocheilus, but in which the axillary pieces are more apparent 

 when the animal is observed from above. The anterior legs are arched, 

 and have at the internal side a strong projection in the form of a tooth. 

 All the tarsi are short, thick, cylindrical, and terminated by two very long 

 hooks. The hood is raised at its interior extremity, in the manner of an 

 almost square lamina. The posterior extremity of the head presents an 

 elevation divided into two teeth, or tubercles. This insect is an inch 

 long, with a red spot on the upper part of each elytron. 



The Cetonia elo7igata of Olivier, appears to be a chemastocheilus. 



