18 INSECTA. 
lateral dilatation or groove; 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 the outer side. 
The tarsial crotchets are unequal. In the 
Curysopnora, De). 
The posterior legs of the males are very large, the thighs very 
thick, the tibize arcuated and terminated at the inner angle in a stout 
point f. 
Rure a, Lat.—Rure.a, Peviwnora, Mac L., Kirb—Op.oenatuus, 
Kirb., Mac L. 
No remarkable difference in the proportions of the legs in the two 
sexes; the mentum almost isometrical ; the scutellum small or mode- 
rate ; sternal point short and not reaching to the origin of the two 
anterior fect. The body is ovoid or oval{. The 
Macraspis, Mac L.—Ceronia, 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 ae the elytra, and of that of the sternal point, the extremity of 
which reaches to the origin of the two anterior legs or extends be- 
yond it. The mandibles are almost triangular, and their extremity 
is pointed and emarginate. The maxille 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 the four anterior ones, is 
bifid, the other entire ||. 
Cuasmopia, Mac Leay. 
The Chasmodie are similar to the Macraspides in the general form 
* The Melolonthz geminata, barbata, castanea, signata, ferruginea, melanocephala, 
pallens, &c., of Fabricius. In the first, the mandibles 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 maxille 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. 
Tt Melolontha chrysochlora, Lat.; Voy. de MM. Humb. and Bonpl., II, xv, 1, 
fem. ; 2, male ;—Scarabeus macropus, Shaw, Nat. Miscel., CCCLXXX, iv. 
t See Catal. de la Coll., &c., Dej.; Hore Entom., I, Mac L. and Encye. 
Méthod. -, article Retele. The characters of the genera ‘Pelidinota and Oplognathus 
do not seem to me sufiiciently determined. 
|| See Catal., &c., Dej.; Hore Entom,, I; Ency. Méthod., art. Ruééle. 
