BY T. G. SLOANE. 583 



isolation, to prevent a break in the arrangement of the other 



genera. Some remote general affinities towards Helluosoma may 



be detected, but none to any of the genera with the labrum 



bisetose. The species of Helluonidius are found under bark on 



tree-trunks. There are four species in Australia, and one (//. 



chrysocomes Maindron) has been reported from New Guinea. 



The Australian species may be divided into two groups by 



their colour. 



^ ,, , , , (H- aterrimus Macl. 



Species wholly black < tt i .- • », , 



yji. latipennis Macl. 



^ . . , , (H. cyaneus Cast. 



Species with elytra cyaneous ... ... ...{ ^t • • tx 



yH. cyanipenms Hope. 



Helluonidius aterrimus Macleay. 



Helluosoma aterrimum Macleay, Trans. Ent. Soc. N. S. Wales, 

 ii., 1873, 323. 



I have seen the type of Helluosoma aterrim,um, Macl., in the 

 Macleay Collection, and have noted that it has the labrum and 

 clypeus of Helluonidius^ to which genus it belongs. Length 

 8 lines, after Macleay. I have the following note, made at the 

 Macleay Museum, with both H. aterrimus and H. latipe^mis 

 Macl., before me. " Differs from H. latipennis by size smaller, 

 prothorax less coarsely and closely punctate; elytra narrower, 

 interstices flat (not the least convex), less coarsely punctate. It 

 is another species." 



Helluonidius latipennis Macleay. 



Helluosoma latipe^me Macleay, Proc. Linn. Soc. N. S. Wales 

 (2), ii., 1887, 217. 



Black. Head 3*65 mm. across eyes, strongly constricted behind 

 eyes; orbits large and setigerous behind eyes; clypeus emarginat*^; 

 labrum long, convex, pointed at apex. Prothorax small, trans- 

 verse (2*8 x 4 mm.), truncate afc base and apex, wider at apex 

 (3*3 mm.) than at base (2-5 mm.). Elytra much wider than pro- 

 thorax (10*5 x 6*5 mm.), punctate-striate ; interstices 3-seriately 

 punctate, even interstices a little wider and more closely punctate 

 than the odd ones. Length 19-21 mm. 



Hah. — Tropical Queensland : Kuranda and Mareeba (Dodd), 

 Atherton (Sloane). 



