2 74 FAUNA HAWAIIENSIS 



(12) Metrothorax siniioluSy Blackburn. 



Cyclothorax simiolus Blackburn, Ent. Mo. Mag. xv. 1878, p. 123. 



Brevior, niger vel piceus, nitidus, antennis pedibusque flavis ; prothorace cordate, 

 parum transverse, ad basin constricto, angulis posterioribus rectis : elytris latis, con- 

 vexiusculis, stria suturali profunda, punctata, striisque aliis duabus valde abbreviatis. 

 Long. 4 mm. 



Closely allied to M. curtipes, but with shorter and more convex elytra, with the 

 thorax constricted, and the hind angles very distinct and definite. The head is narrower 

 and the eyes less prominent. The elytra are but litde longer than broad, 2f mm. long 

 by 2 broad, and are nearly twice as broad as the thorax. The sutural stria is deep and 

 definite throughout, all its anterior part is deeply and definitely punctured, outside it 

 there is another stria of punctures much abbreviate, and external to this an exceedingly 

 abbreviate one ; none of the striae, except the sutural one, is in the least visible at the 

 tip ; the suture is reddish, and the raised lateral margin very distinctly yellowish. 



I think the identification of Mr Koebele's insect with Blackburn's type is correct. 



Hab. Oahu. One specimen (Koebele). Mountains of Oahu, rare (Blackburn). 



(13) Mctrothoi'ttx oalmcnsis, Blackburn. 



Cyclothoi'ax oakuensis Blackburn, Ent. Mo. Mag. xv. 1878, p. 123. 



I have seen only the two specimens of Mr Blackburn, in the British Museum, 

 They seem to be a small Mctrothorax, with yellow margin to elytra and thorax, so that 

 the former are almost plagiate ; the striation of the elytra is less reduced than it is in 

 M. simiolus. 



Hab. Oahu. In the mountains, very rare (Blackburn). 



(14) Mctrothorax crass?/s, sp. nov. 



Robustus, baud latus, politus, niger, antennis palpis pedibusque flavis ; prothorace 

 transverso, basin versus angustato, angulis posterioribus obtusis ; elytris stria suturali 

 profunda, preterea parum striatis. Long. 5 mm. 



Thorax very shining, much narrowed behind, but not at all sinuate, hind angles 

 well-marked but obtuse ; not greatly narrower than the elytra, so that the base is broad ; 

 lateral margin very fine, the median channel fine but definite, the base feebly punctate. 

 The elytra are elongate, the suture pale, the apex flavescent, the lateral margin quite 

 fine. 



We have received only one specimen of this species, which is nearly equally allied 

 to A/, laticollis, citrtipcs and scaritoides. Its form is like that of M. laticollis, but the 



