COLEOPTERA. 415 



\ third section, that of the Xylophili, will comprise the Geotru- 

 pes of Fabricius, and some of his Cetonise. Here the scutellum is 

 always distinct, and the elytra do not cover the posterior extremity 

 of the abdomen. The tarsial crotchets of several are unequal. The 

 antennae always consist of ten joints, the three last forming a foli- 

 aceous club, of which the intermediate leaflet is never completely 

 concealed or encased by the two others. The labrum is not salient, 

 and its anterior extremity at most is exposed. The mandibles are 

 entirely corneous, and jut out beyond the sides of the head. The 

 maxillae are corneous or of a solid consistence, straight and com- 

 monly dentated. The ligula is covered by an ovoid or triangular 

 mentum narrowed and truncated at its extremity, the angles of 

 which are frequently dilated. All the legs are inserted at an equal 

 distance from each other. 



A first division will comprise the Geotrupes of Fabricius. The 

 males differ from the females in particular projections resembling 

 horns or tubercles on the head or thorax, or on both, and sometimes 

 also in the form of the latter. The epistoma is small, triangular, 

 and either pointed, or truncated and bidentated at the extremity. 

 The labrum is almost entirely concealed. Here, the maxillae termi- 

 nate in a simple, coriaceous, crustaceous lobe, more or less pilose 

 and without teeth; there, they are entirely squamous, pointed, and 

 present but a small number of teeth, accompanied with hairs. The 

 mentum is ovoid or in the form .of a truncated triangle. There is 

 no projection on the pectus. The tarsial crotchets are generally 

 equal. The scutellum is small or moderate. Their colours verge 

 on black or brown. 



Sometimes the maxillae are terminated by a coriaceous or crus- 

 taceous edentated lobe, simply pilose or furnished with spinuliform 

 cilia. 



Oryctes, Illig. — Scarabseus, Lin. 



Where the legs differ but little in length, and the four posterior 

 tibiae are thick, strongly incised or emarginated, with an extremely 

 wide extremity, which, in several, is as if stellated. 



O. nasicornis; S. nasicornis, h.; Ross., II, vi, vii. Fifteen 

 lines in length; of a glossy maronne-brown; point of the epis- 

 toma truncated; a conical horn, more or less long, arcuated 



The Cryptodi are disting-uished from all other Scarabseides by their mentum which 

 almost completely covers the mouth beneath, and even by the labial palpi, situat- 

 ed, as well as the ligula, behind it. These two genera are established on Austra- 

 lian Insects which I have not seen. 



