198 



BB. On grijfithi the labrum is darker than on the 

 majority of specimens referred here, but it is entirely with- 

 out gloss. 



C. All these species also have the apex of the labrum more 

 or less distinctly incurved to middle, except on fiavipes. 



D. These species have the front femora either unarmed, 

 or with the teeth so minute that they could easily be over- 

 looked ; quite possibly some of the species that I have regarded 

 as having entirely unarmed femora will be found eventually 

 to have feebly armed ones, but I have examined them care- 

 fully from all directions and could not see any. A slight 

 amount of dust, gum, or grease, however, easily obscures 

 them; but of every species here tabled some specimens have 

 been examined entirely free from cardboard. And here it 

 might be pointed out that with many species the teeth cannot 

 be seen on small specimens when "set" in the ordinary way, 

 even when the teeth are of fairly large size. With the legs 

 hunched together, as they usually are on small unset speci- 

 mens, or on pinned ones, they are normally concealed. 



D. a. I cannot regard the tooth on pavens as distinct; 

 by Blackburn it was tabled as having front femora "widely 

 angulate but not with a distinct tooth." In general appear- 

 ance it is extremely close to viridipennis and evanescens, but 

 the longer hairs on the elytra appear to be distinctive. 



y. To use this character the elytra are best viewed from 

 an oblique hind direction ; from straight above, in front, or 

 even sometimes from perpendicular to the sides, the longer 

 hairs are often not conspicuous, owing to their backward slope. 

 For specimens that have at any time been mounted on their 

 backs, or that show evidence of abrasion, it had better not 

 be used. 



D. h. Usually the whole femora are black, and sometimes 

 metallic as well. 



D. d. Setipennis is obviously closely allied to griffithiy 

 but as its elytral clothing is certainly different to that of that 

 species, and I can find no femoral tooth from any point of 

 view, I am compelled to regard it as distinct. On gri-ffithi 

 the femoral tooth, although not large in itself, is rendered 

 conspicuous by the angulation of the femur. 



D. dd. On one specimen of viridifrons the femora, except 

 at extreme base, are entirely reddish, but on six others they 

 are as tabled. 



D, e. Such a depression is to be found on many other 

 species of the genus, and although seldom sharply defined it 

 is very useful in distinguishing closely allied forms, and with 

 a little experience is quickly detected. 



