82 
THE ORDER OF OOLEOl'TERA. 
The following are the two principal genera : 
A. Club of antenna) small with tlio plates of equal thickness ; size medium or above ; color dark me- 
tallic green or purple, sometimes black Gbotuypks, 7. 
A A. Club of antenna) large and compact with the platos of unequal thickness ; size below medium ; 
color brown Bolboceuus, 3. 
[Fig. 36. 
The G. splendidus, Fab., is our most common species, 
usually about seven-tenths of an inch long, but varying 
considerably in size, and varying also in color from dark 
metallic green to purple. G. excrementi , Say, is a little 
more than five-tenths of an inch in length, and of a 
bronze-black color. G. opacus, Hald., is of a deep black 
color, and varies in length from a little below to a little 
above half an inch ; it is much rarer than the other two 
species. The elytra are not furrowed like the others, but 
only marked with lines of minute punctures. The Bolbo- 
GROTEUTES:— 1, „ _ , . , . 
beotio; 2 , maudi ■ cerus farctus, Panzer, is halt an inch long, brownish-yel 
bles ; 3, antenna, , , . . , , , 
showing the hirp low, with the hind margin oi the thorax, the sutural 
bo.TJn ii 8 ".iii d line, and the broad tips of the elytra black. B. Lazarus, 
joint i» eucased in Panzer, is four-tenths of an inch long, and wholly of a 
after ^Tostwook mahogany-brown color. B. filicornis , Say, three-tenths 
of an inch long, of the same color as the last, and distinguished by a 
slender horn on the top of the head of the males, whilst the others have 
only tubercles. The last species has been separated from the others 
under the generic name of OdonUeus. It is also distinguished by having 
the eyes completely divided by the lateral margins of the head. 
Family XXIX. TROtUfME. 
These insects are readily distinguished by their coarsely pitted thorax 
and ridged elytra. The other characters given in the foregoing table 
I Fig. 37. ) are also very distinctive. They vary 
in size from more than a half to less 
than a quarter of an inch in length, 
and are of a uniform slate-black, or 
brownish-black color. Their habits 
are but little known, but they are usu- 
ally found in sandy situations, and 
Tuox pustulatim, LeC .:— a i.u va • b, pupa; c, sometimes upon the carcasses of dead 
beetle ; d, e , /, log, cervical plate, and maxilla, 1 
with palpi of larva onlargcil-after Kiley. animals.' Mr. Riley breeds TfOX pUS- 
tulatus (Fig. 37.) from dead chickens. They are comparatively rare in- 
sects. They are somewhat numerous in species, but are all included in 
the genus Trox of Fabrieius. 
