MelitjetTies.'] CLAVICORNIA. 243 



1. Upper surface without cross striation or reticula- 



tion between punctures. 



A. Blnck, or with dark hrown reflection, very 

 shining; punctuation strong, and not very close, 



especially on elytra. 



a. Anterior margin of forehead emarginate. 



a*. Body long-oval ; punctuation of elytra 



plainly stronger than that of thorax. 

 af. Punctuation of elytra less diffuse ; 

 metasternum of male with a tubercular 



prominence ou each side of middle . . . M. DIFFICILIS, Ileer. 

 bf. Punctuation of elytra more diffuse ; me- 

 tasternum of male simple ...... M, KUNZEI, Er. 



b*. Body short-oval ; punctuation of elytra 



not much stronger than that of thorax . . M. MOEOSUS, 2?r. 



b. Anterior margin of forehead straight. 



a*. Body short-oval ; colour shining black, 

 af. Punctuation not much stronger on 



elytra than on thorax M. MEMNONltrs, Er. 



bf. Punctuation much stronger on elytra 



than on thorax M. OCHEOPUS, Sturm. 



b*. Body long-oval ; shining, with dark brown 



reflection M. BRUNNicOBNlS,Swn. 



B. Black, moderately shining ; punctuation close 



and fine, almost the same on elytra as on 

 thorax. 



a. Male with the last abdominal segment simple . M. VIDTTATUS, Sturm. 



b. Hale with the last abdominal segment fur- 

 nished with a large smooth tubercle at apex . M. pEDictrLABlTTS,S^Mrm. 



2. Upper surface with cross striation or reticulation 



between punctures ; black, as a rule rather 

 dull. 



A. Cross striation present on elytra only ; anterior 

 tibiae with two stronger teeth at apex, not sepa- 

 rated by smaller teeth M. BIDENS, Bris. 



B. Cross striation or reticulation present on the 



whole of the upper-side. 



a. Thorax at base wider than elytra ; anterior 

 tibiae with two to five stronger teeth at apex, 

 of which two or three are usually larger 

 than the rest ; none, however, are very con- 

 spicuous, and they are very often almost 



obsolete M. TJMBROSUS, Sturm. 



b. Thorax at base at most as wide as elytra ; 

 anterior tibia? with three or four conspicuously 

 stronger teeth at apex, the last but one being 



usually the largest. 



a*. Punctuation closer and weaker ; upper sur- 

 face dull M. INCANUS, Sturm. 



b*. Punctuation stronger ; upper surface 



shining M. OVATUS, Sturm. 



iii. Anterior tibia? without conspicuously stronger teeth 

 at apex; as a rule, evenly and finely, although dis- 

 tinctly, toothed for the greater part of their length, 

 but often presenting irregularities, particularly as 



regards breadth of teeth. 



1. Thorax entirely smooth between punctures; elytra 



R 2 



