COLEOPTERA 197 



profunda, ante hanc seta erecta munito ; elytris regulariter, profunde striatis, striis 

 punctatis. Long. 9 — 10 mm. 



Plate VI. fig. 5. 



Head narrowed immediately behind the eyes ; bearing no punctures except those 

 furnished with the erect setae. Thora.x without any raised margins except just at the 

 hirid angles, the front angles not in the least prominent, much narrower than the elytra, 

 much rounded at the sides, and a good deal narrowed behind ; the hind angles very 

 obtuse ; just within each of them a rather deep depression, and just in front of this 

 a large puncture bearing a seta ; the disc sometimes transversely wrinkled. Elytra 

 narrow at the shoulders which are entirely indistinct ; the rather deep striae are con- 

 tinued quite to the base, where traces of a basal margin exist ; the sculpture is very 

 regular on them, it consists of rather deep striae which are crenate rather than punctured. 

 The under-surface without punctures. 



Hab. Maui: Haleakala 10,000 ft., April 1894. Very rare (Perkins). 



Derobroscus, gen. nov. 



Corpus angustum, elytrorum humeris nullis ; prothorax angustus, immarginatus, 

 absque setis erectis ; elytra margine basali subobsoleta. 



The species for which this genus is established, have a brilliant metallic colour on 

 the upper surface. The narrow form is very remarkable,- and in addition to the absence 

 of a prothoracic seta, renders the members of the genus unmistakable. 



(i) Derobroscus micaiis, sp. nov. 



Angustus, supra viridescens, nitidus, antennis palpisque rufis, pedibus piceis ; pro- 

 thorace impunctato, utrinque ad angulum posteriorem fere in-impresso ; elytris obsolete 

 striatis, in disco seriebus foveolarum parvarum ornatis. Long. 8, lat. 2^ mm. 



Plate VH. fig. I. 



Thorax narrow, rounded at the sides and greatly narrowed behind, the angles 

 depressed and in no way prominent, the margins absent, except that the basal one exists 

 for a short distance on each side ; the surface is slightly wrinkled transversely and at 

 the hind angles there is a very obscure depression bearing two or three punctures which 

 however are more or less indistinct, so that, without careful looking, neither impres- 

 sions nor punctures catch the eye. The elytra are very narrow, the shoulders altogether 

 indistinct ; the elytra are not really striate, but bear series of moderately large foveoles, 

 which in some lights appear to be connected so as to give rise to an appearance of 

 striation. The sculpture is much more obsolete at the apex and sides. The under- 

 surface is black shining and polished, the first ventral suture extremely indistinct. The 

 difference between $ and % is extremely slight, except as to the setae of the last ventral 

 plate. 



