18 INSECTA. 



lateral dilatation or pfroove ; terminal joint of the anterior tarsi cla- 

 vate, with unequal hooks, both bifid. 



The anterior margin of the labrum is apparent. The mandibles 

 are narrow, without any notable emargination or sinus on the outer 

 side, and project but slightly outwards *. 



In the following subgenera, the sternum projects between the se- 

 cond pair of legs in a conical point, more or less long, pointed or 

 rounded at the extremity. 



The anterior margin of the labrum is always apparent. The 

 mandibles are generally crenulated or dentated on tlie outer side. 

 The tarsial crotchets are unequal. In the 



Chrysophora, Dej. 



The posterior legs of the males are very large, tlie thighs very 

 thick, the tibiae arcuated and terminated at the inner angle in a stout 

 point \. 



RuTELA, Lat. — RuTELA, Pelidnota, Mac L., Kirb. — Oplognathus, 

 Kirb.,3IacL. 



No remarkable difference in the proportions of the legs in tlie two 

 sexes ; the mentvmi almost isometrical ; the scutellum small or mode- 

 rate ; sternal point short and not reaching to the origin of the two 

 anterior feet. The body is ovoid or oval \. The 



Macraspis, Mac L. — Cetonia, Fab. 



Differs from Rutela in the proportions of the mentum which is 

 evidently longer than it is broad ; in the short and rounded form of 

 the body ; in the length of the scutellum, which is at least one-third 

 of that of the elytra, and of that of the sternal jjoint, the extremity of 

 wliich readies to the origin of the two anterior legs or extends be- 

 yond it. The mandil)les are almost triangular, and their extremity 

 is pointed and emarginate. The maxillae are furnished with several 

 teeth. The mentum forms an elongated square slightly narrowed 

 near the superior extremity; its superior margin is destitute of cilia. 

 One of the crotchets of the tarsi, at least of tlie four anterior ones, is 

 bifid, the other entire ||. 



Chasmodia, Mac Leay. 

 The Chasmodiae are similar to the Macraspides in the general form 



* The Melolonthre geminafa, barbafa, castanea, signata, ferruginea, melanocephala, 

 pollens, &.C., of Fabricins. In the first, the maiicUbles are strong, arcuated, and 

 hooked at the end. Those of the M. signata, melanocephala, &c., are smaller, straight, 

 truncated, or obtuse at the end. The summit of the maxillae and mentum is also 

 furnished with hairs. From such characters we might form a separate subgenus of 

 these and analogous species. They all belong to South America. 



t Melolontha chrysochlura, Lat. ; Voy. de MM. Humb. and Bonpl., II, xv, 1, 

 fem. ; 2, male ; — Scarabaus macropiis, Shaw, Nat. Miscel., CCCLXXX, iv. 



X See Catal. de la Coll., &c., Dej. ; Hora; Entom., I, Mac L. and Encyc. 

 Method., article Retele. The characters of the genera PeMno/ffl and Oplognathus 

 do not seem to me sufficiently determined. 



II See Catal., &c., Dej. ; Horee Entom., I ; Ency. Method., art. Rutek. 



