106 Descriptive Catalogue [1897. 



than the seventh, transverse, tenth much larger, slightly transverse, 

 eleventh large, ovate ; metasternum raised and plane, very much 

 sulcate lengthways in the middle, glanduloso-squamose, and with 

 another slender transverse anterior sulcus ; abdomen slightly convex 

 underneath, last dorsal segment depressed. Length 1-50-1-60 mm. 



I cannot detect any difference between the South African and the 

 Abyssinian forms, except that the latter is a trifle larger (1*70 mm.). 

 The striking sexual characters of the metasternum and abdomen are 

 exactly the same. 



Hab. Natal (Frere). Very abundant in Abyssinia. 



Odontalgus costatus, 

 Plate XVII., fig. 9. 



Stout, much attenuate in front, chestnut brown, totally covered 

 with ochreous squamae and set with large, shallow, sparse and 

 squamae-bearing punctures, palpi and tarsi testaceous ; head longer 

 than broad, sinuate laterally, vertex subgibbose and obsoletely tri- 

 sulcate, frontal part with a large median foveae ; eyes large, divided 

 by a squamose canthus ; antennae strong and thick, first joint large, 

 second slightly transverse, third to ninth very transverse, tenth 

 larger, eleventh large, ovate, obtuse at tip ; palpi a little short ; pro- 

 thorax narrower than the head, eyes included, irregular and pluri- 

 gibbose, much constricted laterally in front and having five foveae ; 

 elytra shorter than the prothorax and twice as broad, rounded at the 

 shoulders, sinuate laterally, obtusely but strongly tricostate, external 

 costa abbreviate a little before the median part, intermediate one 

 entire, oblique towards the shoulders and sinuate from there, internal 

 one entire, slightly arcuate, suture hardly raised, bifoveate at base ; 

 abdomen stouter than the elytra, first dorsal segment depressed 

 at base and more densely squamose, tricostate and bituberculate at 

 apex, second and third with five tubercles, median tubercle distant 

 from the apex and larger than the others, fourth segment strongly 

 unituberculate in the middle, fifth inflexed and simple underneath ; 

 metasternum smooth and shining, delicately sulcate longitudinally 

 and having close to the intermediate coxae a large, squamose fovea, 

 and on each side a large, triangular compressed tooth ; second and 

 third ventral segments moderately smooth in the middle and shining, 

 the fifth one deeply emarginate in an arcuate form ; femora thick, 

 sulcate inwardly, anterior and intermediate tibia? hardly sinuate 

 while the posterior ones are strongly so. Female. Length 1-60 mm. 



The facies of this insect is very different from that of the other 

 Odontalgus ; the antennae are thick, and the joints transverse, the 

 tubercles on the prothorax are very prominent ; the carinae on the 



