1896.] of the Colcoptera of South Africa. 213 



Ligula long ; paraglossse not quite so long as the 

 lignla ; last joint of palpi rounded at the tip, or very 

 slightly truncate ; median tooth of the mentum rounded 

 at the tip Sub-genus Assotatus. 



Ligula a little longer than the paraglossse ; ultimate 

 joint of the labial and maxillary palpi truncated at the 

 tip; median tooth of the mentum bifid ,, Assoterus. 



Ligula a little longer than the paragiossse ; ultimate 

 joints of the labial and maxillary palpi inflated or fusi- 

 form and broadly truncate ; median tooth of the 

 mentum rounded at the tip ,, Astus. 



Ligula very short ; paragiossse broad, rounded from 

 the outer side, with the tip slightly projecting above the 

 ligula ; last joint of palpi elongated, nearly rounded at 

 the tip ; mentum with the lobes short, and the median 

 tooth very broad at base, rounded at the apex and a 

 little shorter than the lateral lobes ,, AspasUis. 



Synopsis of Species. 



Elytra subrectangular, broad, with the intervals plane, black . . vigilans. 



Elytra with the intervals red, slightly infuscated at the apex . . dorsalis. 



Elytra with the intervals carinate, red, broadly infuscate at 

 the apex and slightly at the base similis. 



Elytra with the intervals carinate, red, with the lateral and 

 postical margins infuscate riifijJeimis. 



Prothorax broad, somewhat rounded ; elytra short, black ; legs 

 and antennae red riifiiies. 



Prothorax very long, shaped like a truncated cone ; elytra 

 gradually ampliate towards the apex, black angusticoUis. 



Prothorax long, narrow, with the outer sides narrowing slightly 

 towards the base ; elytra very narrow, black gracilis. 



Prothorax long, nearly as broad at the apex as at the base, 

 broadly grooved in the centre ; elytra red sulcatus. 



Prothorax long, nearly as broad at the apex as at the base, 

 broadly grooved in the centre ; elytra black Mniszechi. 



Prothorax elongate, subcordiform, very slightly impressed on 

 the outer sides ; elytra black ; legs and antennse red agilis. 



Prothorax narrow, very long, with a deep impression on each 

 lateral side tenuicollis. 



Prothorax elongate, subcordiform, last joint of palpi thickened 

 and truncate iwcedator. 



Prothorax nearly straight laterally, last joint of palpi fusiform, 

 truncate recticollis. 



Prothorax broad, more or less rounded on the outer sides ; 

 elytra gradually ampliate towards the apex - .. atratus. 



Hysteichopus vigilans, Sturm, 

 Insect. -Cab., vol. v., p. 161, pi. 129, fig. O. 

 H. caffer, Dej., Spec. CoL, vol. iii., p. 40. 



Black, with the antennae, palpi, and tibiae rufescent ; head smooth ; 

 prothorax much sinuated in front and broader than at the base. 



