MANUAL OF NATURAL HISTORY 195 



IV. LEGION. — Heteromerous-Beetles (Heteromera). 



Palpi four, two labial and two maxillary ; labrum 

 distinct ; mandibles horny, inner edge with one or 

 two teeth and furnished with a fleshy lobe ; mentum 

 distinct, labium leathery, pilose ; antennae various, 

 never laminated or pectinate ; legs various ; tarsi 

 heteromerous, or with the four anterior 5-jointed, the 

 two posterior 4-jointed. 



X. SUB-ORDER. — Darkling-Beetles (Melasomata). 



Antennae moniliform; maxillae with an internal 

 tooth ; head not narrowed behind into a neck, apter- 

 ous. Colours usually black or dingy. 



57. Family. — Meal-Beetles (Tenebrionidae). An- 



tennae generally moniliform ; palpi thickened 

 at tip, apical joint mostly hatchet-shaped ; 

 head inserted up to eyes in thorax ; thorax 

 quadrate ; body oblong flattish ; claws simple. 

 Feed upon wheat and flour ; frequent corn- 

 mills and bake-houses. 



58. Family. — Sexton-Beetles (Blapsidae). Antennae 



nearly filiform ; palpi with terminal joint 

 large, dilated, triangular ; head inserted ; 

 thorax sub-quadrate ; elytra soldered to- 

 gether; wings none ; body elongate ; claws 

 simple. Found in churchyards and damp 

 obscure situations. 



59. Family. — Burrowing Shore-Beetles (Pimeliidae). 



Palpi filiform ; mandibles bifid at tip ; max- 

 illae concealed by mentum ; labium slightly 

 produced; elytra soldered together; wings 



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