156 M. Louis Peringuey on new genera and species of 



prothorax covered with densely set granules, the prothorax broad, as 

 long as the elytra, with very short pubescence and with the outer 

 margins serrulate ; elytra finely striate, with the intervals broad 

 and finely granulate ; underside black. In the ^ the vertex of the 

 head is armed with two long incurved horns, compressed and 

 truncate at the tip, and the basal space between the horns is 

 developed in a compressed spine, much shorter than the horns, and 

 incised at the tip, and the prothorax has a deep median excavation 

 in the centre, surmounted at the apex by a thick compressed rugose 

 spine, incised at tip, rugose and directed forward ; in the $ the 

 hind margin of the head is produced in a trituberculate ridge, the 

 anterior part of the prothorax is more declivous, with no excavation, 

 and the anterior part is surmounted by a narrow, but high ridge, 

 deeply sinuate in the middle. Length 12-14, width 7-9 mm. 

 Hah. Zambezia (Salisbiu-}'). 



This species is allied to 0. lyyramidaUs, Klug ; in 

 shape the cephalic horns of the 6 are much thinner, 

 more compressed, and spread more outvi^ardly, somewhat 

 in the manner of those of 0. rangifer, Klug, but the 

 median compressed spine is absent in 0. pyramidalis, the 

 thoracic spine is less compressed, and shorter than in the 

 last-uamed species, and ends differently. 



0. ponderosus, n. sp. 

 Bronze-black, a little lighter in colour on the prothorax ; palpi 

 and anteunsj yellow ; clypeus a little elongate in the middle, 

 closely plicate transversely, and having in the middle a transverse 

 raised line, while the hind margin is produced in a high transverse 

 ridge, sinuate in the (J in such a way as to give it the appearance 

 of bearing five short blunt tubercles ; prothorax broad, very 

 deeply sinuate laterally behind, covered with short granules in 

 front, and punctures behind, abruptly truncate in front and with a 

 moderately deep median excavation, the anterior part produced 

 in a transverse ridge, reaching almost from side to side, the 

 median part of which is more raised and slightly sinuate ; elytra 

 striate, intervals very finely shagreened and very closely, although 

 not deeply punctured ; underside piceous. The 5 differs from 

 the (^ in having the occipital ridge, as well as the thoracic lamina, 

 less raised, and the anterior part of the prothorax hardly excavate. 

 Length 19-23, width 11-14 mm. 



Hah. Zambezia (Salisbury, Manica). 

 In general facies as robust as 0. giganteus, Har., 

 from Madagascar. 



