new Sj)ecies of }i\8ter\(\ai. 275 



the pyf^idiuni similarly but rather more evenly punctured ; 

 tlie prostt-rnuin is histriato, stria> rather Hue, scarcely divergent 

 anteriorly, but widen out a little behind, keel, anterior lobe 

 smooth, a few fine punctures only arc seen under the micro- 

 scope ; the nicsosternuni is markodlv prominent anteriorly and 

 has a lateral well-defined mar-^inal stria, but it is not con- 

 tinuetl alon,:; the jirojcction ; the anterior tibial are 5-dentate. 

 This species should be ])laced close to P. elcf/ans. Lew., 

 both having a very prominent mesosternum, but superficially 

 it resembles P. chahjheus in colour and outline, being in the 

 first character somewhat bluer and in the second somewhat 

 more oval. It is remarkable in having <»iily three dorsal 



Hah. S. Thomas I., Gulf of Guinea {Mocquer>/s, 1900). 

 One example. 



Probolosternus, gen. no v. 



Body oval, rather convex ; head retractile, forehead without 

 a transverse stria, labrum transverse, mandibles acute at the 

 tips ; antennte inserted below the frontal margin, club oval, 

 and when at rest is received into a fovea under the thoracic 

 angle like that in the genus Pachjcrcerus ; the thorax is 

 transverse, arched at the sides, gradually narrowed to the 

 anterior angle, anterior angles somewhat acute, marginal 

 stria extremely fine and not passing behind the head, lateral 

 stria complete close to the edge, leaving only a narrow lateral 

 rim ; the elytra, epipleurai finely striate, the interstice be- 

 tween the inner humeral and first dorsal stria is wide at the 

 base; the propygidium is very large, hexagonal, and convex; 

 the pygidium is also rather large and semicircular in outline 

 behind, but being defiected it is invisible from above ; the 

 prosternum, the keel is narrow, bistriate, and incised at the 

 base ; the mesosternum is very prominent anteriorly, and 

 from its base is arched at its sides and is sharply pointed 

 anteriorly where it fits into the base of the narrow prostcrnal 

 keel, the marginal stria is more or less fine but entire ; the 

 tibiai are all dilated, the outer edge of the anterior pair is 

 bowed and niultiilentate ; the tarsi are short with two claws 

 and the tarsal grooves are nearly straight. The curious form 

 of the mesosternum is shown in fig. 1 (p. 277), which is 

 drawn from an txamj<le oi P. pcnnundas. 



Probolosternus ofricanus, sp. n. 



Ovalis, parnm convexus, nipcr, nitidus, Mipra levitcr i>unctulatus ; 

 elytris striis dorsnlibus l-Ii integris, 4 antice interrupta, 5 apicali, 



