568 



REVISIONAL NOTES ON AUSTRALIAN CARABID^. 



Part v. 

 By Thomas G. Sloane. 



Tribe Helluonini. 



Hope, Coleopterist's Manual, 1838, ii., 110; Lacordaire, 

 Genera des Coleopteres, 1854, i., 90; Horn, G. H., Trans. 

 Amer. Ent. Soc, ix., 1881, 160. 



Head punctate, one or two supraorbital sensitive hairs on 

 each side. Antennae stout, rising under distinct frontal plates 

 (these plates punctate-setose). Mandibles with a single tooth 

 near base, setose on outer side. Lab rum large and prominent, 

 with two, four, or six sensitive hairs. Labium with ligula 

 large, corneous (in Australian genera setose on sides, and often 

 on upper and lower sides) ; paraglossae cartilaginous or cor- 

 neous, small, narrow, pointed, not reaching to apex of ligula, 

 very small and reduce I in Australian genera. Maxillae with 

 inner lobe hooked (the hook behind the apex in some Aus- 

 tralian genera) ; inner sides sometimes with a median protu- 

 berance. Palpi stout. Prothorax punctate. Elytra truncate 

 (except in Helluarchus), striate; dorsal punctures present or 

 not on third interstice; base not bordered near scutellum. 

 Ventral segments not bordered on sides. Tarsi setose on upper 

 surface, in cf biseriately squamose beneath (only the second 

 and third joints with two narrow median rows of squamae in 

 all Australian genera) ; ungues simple. 



All the genera known, to me, to belong to the tribe Helluo- 

 nini, will be found tabulated below. The following genera 

 are excluded here, mostly following former authors : Helluo- 

 des, Planet ts J Polystichus, Acrogenys, Lachnoderma, Litho- 



