COLEOPTERA ' 269 



narrow, parallel-sided, the striae definite, impressed and entire, extending from base to 

 tip, but here not deeply impressed, the external one or two obsolete ; the suture and 

 external margin paler. Legs quite pale. 



We have only one female of this distinct species ; of all this Hawaiian group it is 

 the one that looks most like an ordinary Pterostichid, and is therefore of considerable 

 interest. It occurs with some of the Anchomenids that are most differentiated, 

 Atrachycnonis and Dcropristus. 



H.\B. Molokai. In June 1896 at an elevation of about 4000 ft. (Perkins). 



Atelothor.ax, gen. nov. 



Corpus apterum. Prothorax utrinque seta unica ad angulum posteriorem sita. 



This genus, the analogue of Atelothrus in Anchomenides, is represented only by a 

 single species of which only one specimen is known. It is the most recent discovery in 

 Hawaiian ColeoiDtera, having been captured by a friend of Mr Perkins, who made the 

 ascent of Haleakala in 1901 or 1902. He collected 16 species of the Cyclofhorax 

 group, of which two have proved to be new. If it should prove that the absence of the 

 seta is not a constant character, the species would take its place in Mccyclothoi^ax next 

 to M. cognatits, to which it is very similar. 



(i) Atclothorax opfatiis, sp. nov. 



Convexus, piceus, supra aeneus, nitidus, antennis rufis, palpis pedibusque flavis ; 

 thorace transverso, angulis posterioribus rectis : elytris sat profunde striatis, striis 

 impunctatis. Long. 5 mm. 



Extremely similar to iMecyclothorax cognatits, but with the sides of the thorax less 

 sinuate behind. Both thorax and elytra have the raised lateral margin red. The thorax 

 is strongly transverse, the anterior impression and median channel distinct. The elytra 

 have the full complement of striae which run from base to apex. 



The unique exponent was found on Haleakala last year by a friend of Mr Perkins. 

 I regret that I do not know his name. 



H.\ii. Maui. Haleakala. 



Metrothokax, ofen. nov. 



Prothorax setis erectis carens. Alae vestigiales. 



In this genus I have placed the more elongate and larger forms first. 



( I ) Mctrothorax inolops, sp. nov. 



Elongatus, robustus, nitidus, niger, antennis pedibusque fiavis ; prothorace convexo, 

 vix transverso, lateribus valde rotundatis, postice brevissime coarctato, angulis posteri- 



