1922.] 171 



29- 



1 (2) Second ventral segment very deeply, trausversely sulcate at the base, 



the segment very strongly raised from the sulcature, as viewed 

 beneath. 



(Basal abdominal segment with clear, fine, and remote punctures, 

 which become still finer, but denser, a little before the hind margin ; 

 a very large species, the vertex of the head rugose behind the ocelli, 

 the pygidial area very narrow, as in gibbiis.) 



.... spinulosus V. Hag. 



2 (1) Second ventral segment of abdomen at most rising gently from the 



base, and therefore without a deep sulcature. 



3 (8) Vertex of head on the part behind the ocelli evidently punctured, 



the punctures often all distinct, and though sometimes more or less 

 rugose the sculpture evidently consists of puncturation. 



4 (7) Spines on the upper edge of hind tibiae black or pitchy black, rarely 



rufescent, the hairs amongst which they are placed and those that 

 fringe tlie metatarsus outwardly, dark or sordid ; vertex of head 

 viewed from above not at all subquadrate, but greatly narro-wed 

 behind the eyes, the sides being very strongly rounded off. 

 (Pygidial area narrow.) 



5 (6) Fourth abdominal segment shining black, with by no means close nor 



very tine punctures, these being generally irregular in outline; 

 mesonotal punctures very remote, but strong 

 .... ffibbus L. 



6 (5) Fourth dorsal segment greyish from the very numerous, minute, pale 



hairs clothing it, very finely and densely punctured over almost the 

 whole surface, the punctures at most a little less dense along the 

 border of the apical impunctate part 



.... reticulntus Th. 



7 (1) Vertex of head subquadrate, the temples large; the spines of the hind 



tibiae red or testaceous, the hairs amongst which they lie, and those 

 of the metatarsus, pale. 



(Pygidial area flat and not very narrow.) 



.... inonilicornis K. [subquadratus Sm.). 



8 (3) Vertex of head behind the ocelli rugose, rugulose, or roughly sculp- 



tured, practicall}- without definite puncturation. 



9 (10) A large or very large species, robust, the mesonotum strongly, densely, 



evenly punctured ; 2nd abdominal segment with a band of dense and 

 not very fine puncturation, usually occupying about the basal third 

 of the segment ; the hairs on the upper edge of the hind tibiae mor^ 

 or less sordid, sooty-grey, or blackish. *' 



(In typical examples three whole segments and a considerable 

 part at least of the 4th are red ; the spines of the hind tibiae some- 

 times black, sometimes red.) 



.... rujiveiitris Panz. [rubicundus v. Hag.j. 

 10 (9) Large species are without this very dense and conspicuous band of 

 punctures, the punctures, when present, being much finer; fringe 

 of the hind tibiae above generally quite pale, whitish or silvery. 



q2 



