612 REVISIONAL NOTES ON AUSTRALIAN CARABIDiE, V., 



Ametroglossus, n.gen. 



Depressed, black, winged. Head wide across eyes ; neck 

 narrow; orbits behind eyes small, oblique; eyes large, prominent; 

 one supraorbital seta on each side. Antennje long, narrow, 

 lightly compressed ; four basal joints cylindrical. Clypeus 

 emarginate-truncate; one sensitive hair on each side. Labrum 

 large, depressed; apex prominent in middle; one sensitive hair 

 on each side. Mentum with lobes long, triangular, pointed; 

 median tooth prominent, triangular. Ligula furcate; each side 

 produced in a narrow curved lobe turned upwards at the apex; 

 lateral margins with about six setse on each side behind lobes; 

 one sensitive hair on basal half of each lobe; inner surface with 

 four setEB near margin of sinus. Paraglossse rudimentary, carti- 

 laginous; apex pointed, free. Palpi with apical joint securiform. 

 Maxillae strongly hooked ; apex not projecting beyond hook, 

 densely beset with hair; inner side lightly rounded in middle. 

 Prothorax roundly ampliate at widest part, strongly sinuate- 

 angustate to base; upper surface very sparsely punctate, trans- 

 versely striolate. Elytra striate; striae minutely punctate; inter- 

 stices shagreened, subconvex, biseriately punctate (including 

 eighth), fifth with five widely placed dorsal punctures, ninth 

 with a double row of large punctures. Prosternum depressed; 

 no transverse marginal sulcus. Anterior tarsi, in ^, with second 

 and third joints widely dilatate and biseriately squamose beneath; 

 fourth joint small, rather transverse; in four posterior tarsi small, 

 entire. Type, Gigadema atrum Macl. 



Habits : on tree-trunks, under bark. A monotypic genus, with 

 vague general affinities towards Gigadema and Neohelluo ; 

 although it has a forked ligula, it has no affinity to Dicrano- 

 glossus, the only other genus in which the ligula is forked. 



Ametroglossus ater Macleay. 



Gigadema atrum Macl., Proc. Linn. Soc. N. S. Wales, (2), ii., 

 1887, 217. 



Dimensions : head (across eyes) 4*1; proth. 3-75 x 5 (apex 3-5, 

 base 2*5); elytra 14x8 mm. 



Hab. — Queensland : Kuranda (Dodd). 



