( 156 ) 



Oeax (1S64) Paso., Journ. Ent. ii. p. 273 (type : tri(nigiduri.<). 

 Syn. : 7'ra.7()//(« (1893) Kolbe, .S7f«. Ent. Zcil. p. 04 (type: ihiilieiilalns^Vchenea). 



Differs from Llactxs especially iu the third segment of the anteuna not being 

 obviously longer than the fourth, in the lateral spine of the pronotum being small, the 

 elj'tra being shorter and more obviously narrowed apicad, and in the metasternum 

 being mesially much depressed. 



I know five species, namely : — 



Oeax licheuea. 



Oeojr Hellene,! (1891) Duviv., C. R. Sue. K„t. Rdg. p. 420. 

 Syn.: Trnrhytus deMkuhilHn (189.^) Kolbe, I.e. 



Pronotum green, brown in middle, with three distinct tubercles, besides traces 

 of two smaller ones. The height of the tnbercnles variable. We have this species 

 from the Gold Coast (Kumassi), Cameroons, Benito and Kuilu. 



Oeax pygmaeus (1893) Kolbe, I.e. p. 263. 

 Pronotum 9 buff: mesial tubercle very high, the others vestigial. AVe have 

 one specimen from German East Africa. 



Oeax triangularis (1858) White. 

 Similar to pijgmaem, but perhaps distinct. More material is necessary to 

 decide the question. 



51. Oeax coUaris spec. nov. 



S J . Similar to 0. pygmaetis ; differs in the scape of the antenna being shorter, 

 in the prothorax having no black lateral vitta, and in having a very short obtuse 

 side-tubercle, and in the scutellnm being uniformly grey or clay. 



The black occipital M of pygmaeus replaced in collaris by an olive spot. 



Ilab. Leopoldville, Congo, type ; Joliann Albreehts Hohe, N. Cameroons (L. 

 Conradt). 



One pair. 



This is jierhaps the West African form oi pggmaeus. 



52. Oeax lateralis spec. nov. 



? . Narrower than the other species, more uniform in colour, wood-brown ; 

 antenna, legs, underside of body, an indistinct obli<]ue area on elytrum extending 

 from shoulder to middle of suture, grey, disc of pronotum also marked with grey, 

 the wood-brown and grey colour contrasting but little. Apices of tibiae, tarsi, and 

 broad infero-lateral vitta from eye to shoulder, continued as a thin lateral stripe 

 to near middle of elytra, a postmedian, oblique, subsutural dash, and an interrupted 

 lateral anteapical line, black. 



Eye less deeply sinuate than in collaris and pijgmaeus. Pronotum punctured ; 

 mesial tubercle black, smaller than in the other species, the two other discal 

 tubercles vestigial ; sides of thorax strongly rounded between anterior and posterior 

 constriction, with a short spine. Scutellnm unieolorous, grey. Elytra less coarsely 

 punctured than in the other species, not obviously grannlose at shoulders ; apex 



