466 CLASS INSECTA. 



The last articulation of their palpi is elongated. The max- 

 illary lobes are membranaceous. The labrum projects less 

 than in the preceding, and is but little advanced. The man- 

 dibles are very little indeed, or not at all indented. The 

 hood is short, whether arched or rounded, or projecting 

 like an angle. All these insects are very small, with the cors- 

 let hornless. 



Hybosorus, Macl. Scarabceus, Geotrupes, Fab. 



The last articulation of their antennae is in the shape of a 

 reversed and elongated cone, and the intermediate articula- 

 tion of the knob is entirely covered by the other two, as well 

 as in the last sub-genus. The legs are narrow and elongated. 

 The chaperon is rounded in front. Horae Entom. p. 120. 

 Geotrupes arator, Fab. 



AcANTHOCERUs, Macl.* 



The first articulation of the antennae is very large, dilated 

 above into a laminous form, and the edges of the interme- 

 diate leaves of the knob, when it is folded, are visible. The 

 legs, especially the four hinder, are laraelliform, and cover 

 the tarsi folded upon them in the contraction of the feet. 

 The chaperon goes to a point, or terminates in an angle. 

 The corslet is nearly semilunar. 



There, or in our second division of Arenicoli (Trogides, 

 Macleay), the antennae, scarcely larger than the head, are 

 always composed of ten articulations, the first of which is 

 large and hairy. The languette is entirely hidden by the 

 mentum. The labrum and mandibles are scarcely seen ; the 

 latter are thick. The palpi are short. The mentum is very 

 hairy. The jaws are armed with teeth on the inside. The 



* Mac], ibid. p. 136; A. eejieus. I owe the knowledge of this species 

 to one of our most able entomologists, M. Lebefevre de Cerisy. Mr. 

 Macleay refers to the same genus, Trox spinicornis, of Fab. 



