372 Transactions Soutli African PhilosopJiical Societi/. [vol. xii. 



extending oftener than not beyond the mentum ; labial palpi varying 

 in length and thickness ; in Aphoclius the three joints are of nearly 

 equal width and cylindrical, the apical one being, however, a little 

 narrower than the second, or the basal one is swollen at tip, and the 

 second narrower and shorter ; in Oxi/onius the basal joint is short, 

 swollen at tip, the median one is also shoi't and broad, and the apical 

 is longer than the basal, and fusiform but truncate at tip, while in 

 Amnwecins these joints are a little shorter than in Oxyomus and a 

 little thicker ; maxillae with two non-dentate membranaceous lobes 

 the inner of which is very small ; maxillary palpi with the second 

 and fourth joints of nearly the same length, the former is more or 

 less strongly curved and sometimes swollen, and the apical one is 

 sub-fusiform, slightly truncate at tip and not grooved ; eyes slightly 

 incised by the canthus of the genae, and showing much less above 

 the head than on the under side ; clypeus hiding the labrum and the 

 lamelliform mandibles which are membranaceous but more or less 

 horny at base ; head diagonally attenuate laterally from the base or 

 the apex of the triangular gena?. which may project at right angles 

 beyond the eye, be auriculate or bluntly triangular in a line with the 

 outer angle of the clypeus which is emarginate or sinuate at tip with 

 the outer angles broadly rounded, and the angles of the emargination 

 occasionally dentate, it is plane and has sometimes a sub-median 

 transverse impression or carina, a tubercle or a prominence, as well 

 as a transverse intra-ocular impressed line, it is sometimes tubercu- 

 late in the middle and on each side at the junction of the suture of 

 the genae, which said suture is always distinct; it but seldom bears a 

 small but distinct recurved horn {A. rhinoceros), and as often as not is 

 simple but has always a slight elevation above the impressed 

 median apical part of the clypeus ; antennae nine- jointed, club tri- 

 jointed, ovate, pubescent ; prothorax seldom very convex, sub- 

 parallel, more or less obliquely produced laterally towards the base 

 which may or may not be distinctly marginate, and is usually 

 sinuate on each side of the median part ; scutellum moderately long, 

 triangular, or ogival, or very long and sharply triangular (Coloboj)- 

 tcrus) ; elytra elongate, slightly ampliate laterally at about one-third 

 of the length, always convex and covering the pygidium, except in 

 Colohopterns, they have each nine punctate striae and a marginal 

 one, the first five of which reach tlie base, but not the sixth and 

 seventh, the eighth always stops at a great distance from the base, 

 and the ninth unites oftener than not with the marginal one under 

 the fold of the shoulder the callus of which is always apparent, the 

 intervals are either plane for all the length, or plane in the anterior 

 part and convex in the posterior, convex throughout, or sharply 



