174 



from another, having no common facies. New Zealand and 

 New Caledonia has each an indigenous species, but they 

 must be referred to a distinct genus, intermediate between 

 Brachyrrhynchus and Neuroctenus. 



As, among the Aradidae, the Neurocteni. like most of 

 the other Brachyrrhynchini, are by far more variable and 

 inconstant than, for instance, the species of Araclus, Neu- 

 roctenus being probably a geologically young genus, it is 

 somewhat difficult to give good and exact characters for 

 its species. I have attempted to characterize the species as 

 shortly as possible, the long descriptions being too often 

 descriptions of individuals rather than of species. In the 

 male sex I have found some minor, but in certain species 

 very characteristic marks, not hitherto used for the discri- 

 mination of the species of Neuroctenus; the female sex also 

 exhibits similar discrepancies, but there we have always 

 only to do with a relative plus or minus. 



Following Stål, I have divided the species in two 

 groups, according to the length of the first joint of the an- 

 tennas. These groups are, however, in no wise sharply 

 separable. 



1 have seen typical specimens of all the species de- 

 scribed by Stål, Signoret, Burmeister and Mont- 

 rouzier. 



Gen. Neuroctenus Fieb. 



Fieber, Eur. Hem. p. 34; Mayr, Reise d. Novara, Hem. p. 165; 

 Stål, Enum. Hem. III, p. 140. 



Corpus ovatum vel elongato-ovatum, glaber, minute 

 granulatum. 



Caput subquadratum, spinis postantennalibus et denti- 

 bus postocularibus praeditum, antice in processum obtusum 

 prolongatum. Rostrum totum in sulco rostrali incubatum. 

 Sulcus rostralis lanceolatus vel fere subovatus, marginibus 

 nempe in medio quam basi et apice multo magis distanti- 



