BY ARTHUR M. I.EA. 609 



cavernous.* Metastermim large, longer than first segment of 

 abdomen, transversely and largely but shall owly excavated; flanks 

 almost vertical, not much longer than wide, base oblique, apex 

 •with coxal emargination: episterna almost entirely concealed, the 

 extreme apex appearing as if belonging to the mesosternum. 

 Abdomen moderately large, sutures distinct, two basal segments 

 concave in ^, the first larger than second, intercoxal process 

 very wide; three apical segments of almost equal width and 

 suddenly depressed below second; third and fourth combined 

 shorter than second or fifth. Legs long; posterior coxae almost 

 touching elytra; femora strongly grooved from base to apex, 

 extreme base strongly compressed, dentate or not;t tibiae some- 

 what compressed, straight or almost straight; tarsi stout, third 

 joint wide, not very deeply bilobed, claw-joint thin; claws very 

 minute. Elliptic, convex, highly polished; apterous. 



This genus is abundantly represented in New Guinea, and 

 sparingly in New Zealand. The two Lord Howe Island species, 

 referred by Mr. Olliff to Idotasia, belong, I believe, to Ampagia; 

 one of them certainly does, and here they are dealt with under 

 that genus. 



The Australian species may be thus tabulated : — 

 Protliorax with coarse punctures, no larger (but more 



crowded) on sides than on disc lofla, n.sp. 



Prothorax with punctures much larger at sides than on 

 disc. 



Elytra not punctate un hind declivity, except at 



extreme apex albidosparsa, n.sp. 



Elytra distinctly punctate on posterior declivity. 



Striie invisible from most directions evanida Pasc. 



Striffi fine but distinct cequalis I'asc. 



Idotasia evaniua Pasc; Mast. Cat., Sp.No.5578. 



Black, shining. Snowy-white scales in rostral grooves, and 

 forming two rows on femora; apex of femora with scales in 

 punctures, a moderately large patch on the posterior; tibite with 

 very small scales; each lateral prothoracic puncture with a scale. 



* At least in the Australian species. 

 t Edentate in the Australian species. 



