102 Memoirs on the Coleoptera 



3 — Mandibles straight or not at all overlapping or decussate, not obviously 

 dentate within 4 



Mandibles decussate and strongly dentate or bifid, or rarely straight, though 

 strongly dentate within, scarcely at all overlapping and, in such cases, 

 together rather prominent when closed 14 



Mandibles quadrate, truncate, not decussate, closing on a short straight line.. . 16 



4 — Femora spiculate beneath; tibiae rounded externally toward base 5 



Femora not spiculate, the tibiae similarly evenly rounded externally 12 



Femora not spiculate, the tibiae with a very sharp and prominent external tooth 

 near the base 13 



5 — Mandibles externally oblique and subevenly arcuate from base to apex 6 



Mandibles with the external outline oblique and straight to beyond the middle, 

 there abruptly and almost rectangularly turned inward, the apical part nar- 

 row and acuminate beyond this point 11 



6— Mesosternum not modified; under surface without patches of dense scales. .7 



Mesosternum transversely prominent, often porrectly produced and sinuate or 

 bilobed 10 



7 — Antennal club small or moderate 8 



Antennal club greatly elongated; body coloration brightly metallic, highly 

 polished 9 



8 — Strial intervals of the elytra. very convex; surface highly polished, the elytra 

 bicolored; prosternal processes of the male long and conspicuous. [Type 

 5. fasciatus nov.] Stegotidius 



Strial intervals very flat; pronotum with a prominent tumidiform carina; surface 

 deep black and opaque, the beak long; prosternal processes of the male 

 somewhat short and slender; body broadly rhombiform, rather large in size. 

 [Type Cryptorhynchus leachi Kirby] Camelodes 



Strial intervals flat or very nearly so; pronotum not carinate, generally evenly 

 convex, sometimes gibbous; beak long and slender to moderately short and 

 thick; surfaces polished and smooth above, black throughout or with rufous 

 prothorax, generally wholly glabrous, but sometimes with the scutellar lobe, 

 scutellum or presternum clothed with pale squamules; elytra never more 

 than moderately grooved, the humeri always prominent, either laterally or 

 dorsally; scutellum not flat, transverse and free; outline rhomboidal, the 

 prothorax tubulate at apex; species extremely numerous. [Type 5. rhom- 

 bicus nov.] Stegotes 



Strial intervals and most of the structural characters as in Stegotes, but with the 

 elytra very peculiar in coloration, almost exactly as in Eucoleomerus ; sur- 

 faces above smooth and very shining; antennal club a little longer, with 

 deep sutures, about as long as the five preceding joints combined; elytra 

 without prominent humeri. [Type 5. mimetica nov.] Stegotopsis 



9 — Body rhomboidal, with prominent humeri as in Stegotes, the beak long, 

 arcuate; under surface without patches of dense scales, the mesosternum 

 normal; prosternum sharply canaliculate. [Type G. chalybeus nov.] 



Gladosius 



10 — Body rhomboidal, generally more elongate than in Stegotes, and having 

 beneath sharply defined patches of very dense whitish scales, somewhat 

 variable in number and extent; prosternum not canaliculate as it is in 

 Stegotes, almost perfectly flat as a rule. [Type Centrinus tumidus Boh.] 



Diastethus 



11 — Form, polished lustre and smooth upper surface as in Stegotes, but with 

 bicolored elytra, the antennal scape shorter, at tip much further from the 

 eye than in that genus; beak long, slender, more rapidly bent basally; 

 prosternum with an extremely shallow parallel impression, the coxae separated 

 by three-fourths their width; body small in size, broadly rhomboidal. 

 [Type M. scapulinus nov.] Microstegotes 



