RHINOTMETUS. 33 



equal length with those of the males ; the legs also (especially the 

 anterior tibiae) are not quite so robust. All the examples which I 

 have seen differ also sexually in shade of colour, there being in the 

 females an entire absence of a metallic coppery hue ; and the emerald 

 green colour, so conspicuously beautifid in the males, being repre- 

 sented by blue. 



This handsome species is not uncommon on the western coast of 

 Africa, — Guinea, Senegal, and Old Calabar. 



Genus 5. RHINOTMETUS*. 



Dej. Cat. (1837) p. 407. 

 Corpus elongato-ovaJe vel subovatum, conveooum, 

 Labrum transversum, integrum. 



Mandibul^: robustce, reconditce, ad apicem ipsum sapiusjissa?, necnon 

 intra apicem dente armatce. 



Palpi maxillares elongati, subincrassati, art. 3 h ° ad apicem oblique 

 truncate 



Palpi labiales minuti, art. 2 nd " lato. 



A.HTVKyjEJilifor'mes, articidis 1'"° et 3**° inter se cvqualibus (illo distincte 

 robusto), 2 nd " brevi, ultimo ad apicem acuminato. 



Caput plus minus antice product um, subattenuatum. 



Thorax elongatus, haud transversus, elytris plerumque multo an- 

 gustior, antice rotundatus et subcontr actus, ad latera depressus et 

 marginatus. 



Elytra sat robusta, punctato-striata, modo vestita, modo nuda. 



Abdomen e segmentis quatuor composltum. 



Pedes saltatorii (femoribus posticis valde incrassatis) ; tibiis anteriori- 

 bus ecalcaratis, posticis calcari singulo unciformi armatis ; tarsis 

 pseudotetrameris, anterioribus subtus dense vestitis, artic. I™ et 

 3' 10 dilatatis (hoc valde bilobo), posticis haud dilatatis, brevibus, 

 articidis l m0 , 2 nd0 et 3"° subcequalibus (2 nd0 et 3''° inter se subarctius 

 connatis), subtus leviter productis, articulo ultimo ad apicem 

 ipsum in globulum subito aucto, unguiculis minutis subtus munito, 

 superne e visu reconditis. 



Labrum transverse or subsinuate, rounded at the lateral margins, 

 narrower than the base of the head. 



Mandibles small, robust, concealed from above. 



Maxillary palpi (Front, fig. 3m, 5m) elongate, subincrassated ; the 

 basal joint small; the second ovate, truncate at the apex, and gra- 

 dually attenuated towards the base, the length being not quite double 

 ■the breadth ; the third is of the same form as, but slightly longer 

 and wider than, the second, broadly truncate at the apex; the terminal 



* piv, nasus ; rizftvw, seco. 



