56 Transactions of the South African Philosophical Society. 



4. (3) Caput in vertice convexum, ad processum bifidum pronoti arete applicatum; 



pronotum postice convexius, antice suleo lato transverse impressum, callo 

 antico postice non bilobato. 



5. (8) Pronotum margine antico inflexo et valde inciso. 



6. (7) Rostrum ad basin obtuse calloso-elevatum ; pronotum callo anti colatiore, 



impressione subapicali non evidenter bifoveolata. 



3. H. callosicollis, Fahr. 



7. (6) Rostrum ad basin acuminatum, non calloso-elevatum ; pronotum callo antico 



angustiore, et foveis duabus apicalibus profundis, bene definitis, carina 

 tenui separatis, instructum 4. H. proles, Kolbe. 



8. (5) Pronotum margine antico vix inflexo, levissime tantum emarginato. — Rostrum 



quadrifoveolatum, ad basin non elevatum ; frons leviter carinata. 



5. H. omissus, Pasc. 



1. HOPLITOTRACHELUS ORBITALIS, Kolbe. 



H. orbitalis, Kolbe, Arch. f. Naturg. Jahrg., 1898, p. 258. 



Long. 15-201 ; lat. 8-101 mm.* 



Head with a broad and deep transverse furrow extending from 

 side to side above the eyes, but only properly visible when the 

 rostrum is entirely sunk into the prosternal furrow ; superciliary 

 ridges strongly elevated, the space between them containing two 

 deep foveas divided by a central carina. Bostrum with a very 

 prominent basal tubercle and a distinct central carina, which is 

 elevated in the basal half and lower towards the apex ; the dorsal 

 margins rather sharply angulated and elevated about the middle. 

 Prothorax quite plane dorsally and covered with deep subremote 

 punctures, without any transverse impression anteriorly, but with 

 the apical area very abruptly elevated and forming a large callus, 

 which is deeply bilobate posteriorly and without any carina between 

 the lobes ; basal margin with two sharp prominences which overlap 

 the basal calluses on the elytra ; sides with a long sharp spine 

 surrounded by a semicircle of four conical tubercles. Elytra ovate, 

 deeply and irregularly recticulate, with three rows of large sharply 

 conical tubercles and a few smaller tubercles between them ; the 

 inner row abbreviated basally, the outer row with four (rarely five) 

 tubercles only. 



German E. Africa : " E. Usambara and Madinula " {teste Kolbe), 

 Dar-es-Salaam, Kilwa. British E. x\frica : Nairobi {B. Ford). 



Type in the Berlin Museum. 



The deep cephalic furrow and the basal prominences on the 

 thorax will at once distinguish this large species from all its 

 congeners. The mesosternal tubercle is well developed in all the 

 specimens which I have seen. 



* All measurements of length are taken from the anterior margin of the 

 prothorax to the apex of the elytra as seen vertically from above. 



