COLEOPTERA 199 



posteriorem impresso ; elytris in disco seriebus foveolarum mediocriter profundarum 

 munitis. Long. S, lat. 2f mm. 



This resembles Derob7'oscus solitaruts almost exactly ; the thorax is however 

 slightly shorter and scarcely so narrow behind, and the foveolae of the elytra are 

 not quite so well developed. 



Hae. Oahu : Halemano, under bark of Koa tree, January i S93, two male specimens 

 (Perkins). 



Prof. Thaxter found Laboulheniaceae on one of these and labelled it No. 12 15. 



Anchonymu.s, gen. nov. 



Facies generis Aiichonicui. Alae minutae. Thora.x marginatus absque seta erecta. 

 Elytris simpliciter striatis, margine basali arguta. Abdominis suturis haud profundis. 



The Insect for which this genus is proposed resembles the Anchomenoid forms of 

 Discnoclms, so that it may readily be mistaken for D. fractns ; it is distinguished there- 

 from by the absence of a thoracic seta. From Aiichotefflns it differs in the delicate 

 simple sculpture ot the elytra. It is of metallic colour, and makes a first approach to 

 the specialisation that has become so marked in Brosconyimis. Discnochus fnxctus and 

 Anchonynms agimoidcs make a distinct lead from an ordinary Agonuvi to the two 

 remarkable Hawaiian genera Dcrobt'oscus and Brosconymus, and warrant us in supposing, 

 without too great a stretch of the imagination, that these two aberrant genera may have 

 arisen within the islands from ordinary forms of Anchomenides, such as are to be found 

 in many parts of the world. It is, too, worthy of note that the two "leads" have some 

 approximation in habits to the two forms that are highly specialised both in habits and 

 sculpture. 



(i) Anchonyimis agonoidcs, sp. nov. 



Niger, nitidus, gracilis, subdepressus, elytris laete viridibus, antennis palpis pedi- 

 busque ruhs his interdum picescentibus ; elytris regulariter striatis, interstitiis latis, 

 planis. Long. 10 mm. 



Plate VI. fig. S. 



This is readily distinguished from D. fractits. and most of the other Hawaiian 

 allies, by the simple and regular striation of the elytra ; the outer striae consist of series 

 of fine, elongate punctures. The thorax is narrow, with the hind angles very obtuse ; 

 there is very little punctuation on the basal part. About fifty examples. There is not 

 much variation in this series of specimens, but it is in the direction of D. fractus, so 

 that the two forms approach rather closely, though the extremes are very distinct. 



Hab. jNIaui: Haleakala, about 5000 ft., April 1894, under bark of Acacia (No. 250), 

 nearly 50 specimens. One specimen in Oct. 1896 (No. 680). 



This species is very much attacked by Laboulheniaceae ; Prof. Thaxter took speci- 

 mens under the number 1229. 



F. H. III. 26 



