BY THOMAS G. SLOANE. 647 



The following species should not, I think, be separated from the 



Australian Carabs referred to the genus Drimosto7na by deCastelnau 



in his work on Australian Carabidse.* It however presents some 



very decided differences ; the most noticeable being its greater 



size, and the form of the antennse and mentum. In 2). hehnsiihe 



antennae are moniliform and slightly thicker to the apex ; while 



in a species from Victoria in my collection, which I regard as D. 



australis, Casteln., the antennae are filiform and slender j the 



mentum in D. helmsi is short, with the lobes rounded on the outer 



side, obtuse at the apex, and broadly oblique on the inner side; in D. 



australis (?) the mentum has the lobes triangular and pointed 



at the apex, the inner and outer sides being sharply and about 



equally oblique ; the median tooth does not present any differences. 



Both species seem to agree in all other points and both have the 



scrobe of the mandibles furnished with a setigerous puncture in 



front. 



Drimostoma helmsi, n.sp. 



Black ; legs, palpi, and antennae piceous. Head small ; fore- 

 head with a straight strong longitudinal groove on each side ; the 

 clypeal suture distinct between the grooves ; clypeus large, 

 declivous, truncate in front, the lateral setigerous punctures 

 strongly marked ; neck short, globular, slightly raised above the 

 plane of the forehead ; eyes prominent, hardly inclosed behind, 

 but strongly inclosed below ; two supra-orbital punctures on each 

 side. Labrum sex-setose, truncate. Mandibles short, strong, 

 curved and acute at apex ; scrobe with a setigerous puncture in 

 front. Mentum short, obliquely emarginate ; lobes obtuse at the 

 apex, rounded externally ; median tooth short, broad, triangular, a 

 rounded suture dividing it from the mentum. Palpi short ; max- 

 illary having penultimate joint narrow, triangular, last joint elon- 

 gate (longer than penultimate), narrowed and subacute at apex ; 

 labial having last joint rather longer than penultimate, thick, club- 

 shaped, the apex obtuse. Antennae short, moniliform, slightly in- 

 crassate; 4 basal joints cylindrical, others subquadrate, compressed, 



* Trans. Roy. Soc. Victoria, 1868, VIII., p. 198. 



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