156 ON A NEW GENUS OF CARABID^. 



Thorax planus subcordatus angulis posticis rectis. 

 Corpus planum, apterum. 



Pedes validi, femoribus medio incrassatis, tibiis anticis intus 

 profundc emarginatis. 



Species Ill.\phands Stephensii. (PI. XV.) 



Testaceus nitidus, elytris oblique sulcatis. 



Long. I lin., lat. \ lin. 



Hab., Wollongong. 

 This is an exceedingly minute insect ; its colour is pale 

 testaceous. 



The elytra have an oblique longitudinal stria or groove ex- 

 tending from tbe base near tlie suture to the outer angle of the 

 apex. Five specimens of this very remarkable species were ob- 

 tained in the locality indicated ; they were all found adhering to 

 the under sides of stones along the line of coal tramway which 

 skirts the beach for some distance out of Wollongong ; theu" ex- 

 treme minuteness renders it, however, a very difficult matter to 

 detect them, and it is only by patient examination that the col- 

 lector is likely to be rewarded by a specimen of this very in- 

 teresting insect. 



I have named the species after my friend W. J. Stephens, 

 Esq., M.A., the Treasurer of our Society. 



The affinity of Illaplumus is clearly to the genera Anillus of 

 Jacquel Duval; Aepus, of Leach; and Anojjthahnus, of Sturm. 

 From the first of these genera (^Anillus) to which it has the 

 greatest affinity, Illaphanus differs in the head, which is large 

 and broad ; in the antennJB, which have the first four joints 

 turbinate ; in the labrum, which is without emargination ; in the 

 maxillary palpi, which have the last joint much swelled ; in the 

 labial palpi, which have the last joint turbinate ;* in the mentum, 

 which is without the medial tooth ; and in the legs, which have 

 the thighs flat and ovate, and the fore tibiae with the emargination 



* The long terminal seta of the labial palpi may answer to the last joint 

 of those oi Anillus, which is described by Jacquel Duval as being long, sharp, 

 and slender. Taking this view of the matter, the labial palpi of the two 

 genera would be very much alike. 



