Mr. ii. Murray on Coleaptera from Old Calabar. 347 



a triangular fovea on each side of the base united by a somewhat 

 bisinuate transverse line ; dorsal line distinct, reaching from this 

 basal line to the anterior margin ; semilunar depression in front 

 distinct and somewhat triangular, not more punctate or rugose 

 than the neighbouring parts; posterior angles obtuse, not 

 rounded, approaching a right angle at the very point for a very 

 short space. Scutellum rather elongate, impunctate. Elytra 

 broader than the thorax, two and a half times the length of the 

 thorax ; shoulders prominent, marked with the finest transverse 

 aciculations, which are not visible except under a powerful mag- 

 nifying glass; punctate-striate ; the interstices sparingly and 

 faintly punctate here and there ; slightly convex, wider at the 

 base than the apex, the space between the third and fourth and 

 fifth and sixth striae widest, the latter with a rugose marking at 

 the base ; the marginal space wide, widest towards the apex. The 

 under side of the body black, impunctate ; abdomen dark piceous, 

 with a silky opake lustre ; more strongly aciculate than the elytra. 

 Thighs with papillary punctures along the sides and near the 

 joint ; tibiae and tarsi dark piceous. 



This species seems to come nearest to Hope's 0. latus, or his 

 0. lont/ipennis, described in these 'Annals,' 1st series, vol. x. 

 p. 92 ; but the somewhat larger size, and the sulcation of the 

 elytra, instead of striation, with the deep pnnctation of the sulci, 

 " sulcis fortissime punctatis,'' which he gives as a character of 

 the former, sufficiently distinguish it from this species ; and the 

 relative proportions of the elytra and thorax in 0. longipennis, 

 the former being stated at four times the length of the latter, 

 prevent its being confounded with this, which has the elytra only 

 two and a half times the length of the thorax. 



2. O. Clarkii, mihi. 



Niger vel nigro-piceus,nitidus,pr3ecedente angustior et eonvexior; 

 antennis trophisque, corpore subtus pedibusque ferrugineo- 

 piceis ; capite sparsim profunde punctato, bi-imprcsso ut in 

 O. rugicipite ; thorace fere ut in O. rugicipite, sed Isevior et cum 

 punctis sat profundis in rugis positis ; elytris multo minus di- 

 stincte aciculatis quam in O. rugicipite^ minus profunde striato- 

 punctatis, interstitiis fei'c planis, sparsim punctatis pnccipue 

 lateribus et apice, et cum lepidis lineis hie et illic irregulariter 

 transversim duclis ; subtus ut in O. rugicipite, sed episternis 

 metathoracicis oblique rugosis; femoribus pallidioribus. 



Long. 7^8 lin., lat. 3 lin. 



Black or dark piceous, shining, narrower and more convex 

 than O. rugiceps. Head not rugose, but covered with large, deep, 

 scattered punctures ; an angular depression united by a trans- 



