470 DescTipti've Catalogue [1896. 



situated on the stria ; legs moderately long ; anterior tarsi of the 

 male dilated, and both anterior and intermediate ones spongy 

 underneath ; claws simple. 



Gen. GEOB^NUS, Dej., 

 Spec. CoL, iv., p. 402. 



Mentum broadly notched, the median part with a very minute 

 tooth, apical part of the lateral lobes sharp ; ligula narrow, sub- 

 truncate apically and bearing two long setae ; paraglossae not broader 

 than the ligula, slightly excised from the tip, a little longer and 

 curving a little inwardly ; last joint of maxillary and labial palpi 

 subfusiform and acuminate at tip ; labrum transverse, truncate ; 

 antennae moderately long, filiform, the three basal joints glabrous ; 

 head with moderately prominent eyes, and very short behind the 

 eyes, two supra-orbital setae ; prothorax transverse, very slightly 

 narrowed laterally in front and behind and not sinuate, and having 

 an ante-median and a supra-postical lateral seta ; elytra oblongo- 

 ovate, subdepressed, striate, third stria with two ante-median punc- 

 tures, and second and third intervals with a supra-postical one ; legs 

 moderately long, second, third, and fourth joints of the anterior tarsi 

 of the male dilated, cordiform, the fourth one short and incised, all 

 four spongy underneath, although in a lesser degree than in Aniso- 

 dactylus ; intermediate tarsi elongate and also spongy underneath, 

 with the exception of the basal one. 



This genus has been erroneously included by Lacordaire in his 

 tribe *' Anisodactyles," owing probably to the spongy under part of 

 the tarsi of the male, but it belongs undoubtedly to the Pterostichides, 

 owing to the presence of the two supra-orbital setae, the three punc- 

 tures on the third interval or stria, and the grooved posterior tarsi, 

 although this last characteristic is not strongly marked. 



De Chaudoir says that the nearest ally to GeohcBnus is Antarctia, 

 and Dr. Horn suggests the addition of GeohcBnus and Antarctia to 

 the Platynides, but as constituting a distinct group ; I consider that 

 the spongy covering of the under part of both the intermediate and 

 anterior tarsi of the male is too important a character not to lead 

 to the creation of a tribe for the reception of the genus. 



The genus has only so far been met with in South Africa. 



Synopsis of Species. 



Prothorax and elytra fuscous, and with a broad flavescent marginal 

 band ; elytra with the lateral striae distinct lateralis. 



Head and prothorax red ; elytra infuscate, and with a very broad, 

 flavescent outer margin, lateral strise indistinct iiicertus. 



Black ; prothorax with a very narrow rufescent outer margin . . ingenuus. 



