192 FAUNA HAWAIIENSIS 



Deropristus, gen. nov. 



Thorax marginatus, ad angulum posteriorem seta erecta munitus. Alis perminutis. 

 Elytra grosse sculpturata, ad basin in medio haud marginata. Abdomen suturis 

 perprofundis. 



The species of this genus differ markedly from Blackkirnia by the shape of the 

 base of the elytra. The legs and antennae are moderately elongate. The males have 

 the sexual clothing of the front feet similar to that of most of the other Hawaiian 

 allied genera. 



Although very different in appearance from Atrachycncvtis, Deropristus appears to 

 be really allied thereto. The different shape and sculpture and the longer legs, palpi 

 and antennae, and the extraordinarily deep ventral sutures are the only characters I find 

 to distinguish it. The vestigial wings are in these forms reduced to their extreme, 

 being scarcely '5 mm. long. 



(i) Deropristus hlaptoides, Blackb. 



Blackburnia blaptoides Blackburn, Ent. Mo. Mag. .xv. p. 157. 



This is a very distinct species of large size, massive build, with the foveae of the 

 elytra very large and crowded. It is known only by a single specimen. 

 Hab. Oahu : Konahuanui, 1500 feet ; under a stone (Blackburn). 



(2) Deropristus pi0icticeps, sp. nov. 



Piceus, nitidus, capite thoraceque profunde punctatis, hoc basin versus evidenter 

 angustato, margine laterali prope angulos posteriores fortiter elevata; elytris nitidis, 

 sulcatis, sulcis numerose punctatis, interstitiis subconvexis. Long. 1 1 mm. 



Plate VI. fig. I, specimen with right elytron and vestigial wing extended. 



Readily distinguished from the following species {D. deroderus) by the broader 

 thorax, the sides of which stand up more behind, as well as by several characters of 

 structure. The coarse sculpture of the thorax is deep but not dense, and is irregular, 

 the interstices between the punctures varying much in their extent ; the seta is placed 

 on the lateral margin, some considerable distance (^ mm.) in front of the angle. The 

 deep foveae in the grooves of the elytra are very numerous, there being 37 on the 

 sutural groove. A small series. 



Hab. Molokai. In the mountains below the densest forest, 4000 ft. May and 

 June, 1894 (Perkins, Nos. 189, 589, 592, 594). 



(3) Deropristus deroderus, sp. nov. 



Piceus, sat nitidus ; capite thoraceque grosse, profunde punctatis, hoc basin versus 

 minus angustato, margine laterali parum elevata ; elytris sulcatis, sulcis numerose foveo- 

 latis, interstitiis angustis, vix elevatis. Long. 9^10 mm. 



