BEETLES. 115 



are expanded into a triangular tooth at the extremity. It is 

 found on sandy roads in spring, and is common locally. 



Genus Bolitophagus, lUig. 

 Antennce gradually thickened towards the extremity. 

 Mouth-parts quite covered by the rough clypeus. The wing- 

 eases are broad and shortly cylindrical. They live in fungi 

 growing on trees. 



* B. Tcticulatus, Linn. (Plate XII., Fig. 10). This species is 

 black or brown, with the pronotum expanded in front of the 

 middle, and much narrowed behind. It is found in fungi, and 

 is almost confined to the Tay district in Britain. 



Genus Diaperis, Geoffr. 

 Body short, oval, and very convex, almost hemispherical. 

 The process of the prosternum is narrow. The only species is : 



* D. boleii, Linn. (Plate XII., Pig. 11). Elytra with very 

 fine scattered punctures, and yellow bands. It lives in fungi 

 growing on oak and beech trees, and under the damp bark. 



Genus Tenebrio, Linn. 

 Body elongated. Antennse moniliform, slightly thickened 

 towards the extremity, with the third joint the longest. 

 The pronotum is broadest in the middle. The beetles live 

 in rotten wood. 



* 7\ niolitor, Linn., the Meal-worm Beetle (Plate XIL, 

 Pig. 12). Pitchy-black or brown, finely punctured. The 

 under surface and legs are reddish-brow^n. It is found in 

 old fiour and bread troughs, and in the rotten wood of oak 

 and pine trees. The larva is known as the " meal worm." 



Genus Helops, Fabr. 

 Eyes kidney-shaped. Pronotum closely fitting to the wing- 

 cases. Antennae filiform, and longer than the head and 



