ERIC MJOBERG, PTINID^. 5 



But also the top-joints are subject to reduction, as can 

 be seen in the genera with more specialized and modified 

 antenn ae, for instance Paussoceros. Here the last joint (9th) 

 is practically rudimentary and received in a large excavation 

 of the penultimate one. In Paussoptinus the last joint is 

 smaller than the others and sinuate. 



In Monectrephes the penultimate joint is more ore less 

 sinuate, receiving the smaller last one. That is distinctly the 

 case with the above described new form. According to West- 

 wood's figure of 31. pascoei the last joint is strongly sinuate, 

 but the figure is not clear enougli to allow any conclusions 

 regarding the oceurrence of a smaller apical joint. Very 

 likely such a joint will prove to be present on a more careful 

 examination. 



Dipliohia familiaris Oll. is apparently one of the less 

 modified myrmecophilous PtinidcB of Australia, the antennas 

 according to OLLiFr's description beeng 11-jointed and fili- 

 form. But in regard to the thorax, and by its having basal 

 impressions and impunctate elytra with indistinct traces of 

 strise cet., it reminds of some of the more true myrmecophil- 

 ous forms. 



Concerning the interesting form Enasiha tristis Oll., 

 known only from the unique type specimen, which is supposed 

 to have been a little damaged(?), the author remarks that 

 the specimen in question seems to have löst the terminal 

 joint of each antennae. It seems me very probable that this 

 form in fact has only ten joints. What makes me believe 

 this, is Olliff's information: »the ninth globose and enlarged», 

 which makes it very probable that this larger joint is the 

 true tenth, being homologous with the enlarged one in 

 Diplocotes and Decemplocotes. One supposed joint more would 

 make this enlarged one in Enasiha the ninth one, which 

 would give us an antenna of quite a different type com- 

 pared with Diplocotes, Decemplocotes and Polyplocotes. This 

 seems me less probable on account of all other similarities 

 in Enasiha with the true myrmecophilous species, for in- 

 stance the constriction and striolation on the thorax, the very 

 finely striate-punctate elytra with the large basal impressions 

 etc. To this must be added, too, that the last joint especially 

 in Diplocotes and Decemplocotes is abruptly truncate, giving 

 the impression of there being one following end-joint missing. 



