436 FAUNA HAWAIIENSIS 



The following table may assist in determining the genera ; 



Elytra leaving only tip of abdomen exposed Haptoncus. 



Elytra leaving more than one segment exposed : — 



Form very flat; tarsi small, without lobes Cillaeopeplus. 



Form elongate moderately depressed ; tarsal lobes very small ; sides of thorax 



densely ciliate Notoptplus. 



Form not very elongate or depressed 



Sides of thorax depressed, not directed outwards Carpophilus. 



Sides of prothorax directed outwards : — 



Size comparatively large, usually 6 — 9 mm. of length (in Gotiiorydus 

 pusillus, only 4§). Gonioihorax, Gonioryctus, Nesaptei'us, Eu/iitidula, 

 Orthostolus, Cyrtostohis, Apetasimiis. 

 Size small, 4 mm. or less of length. Apetinus, Eupetinus, Nesopeplus, 

 Nesopetinus. 



GoNiOTHORAX, gen. nov. 



Femora sat elongata, anteriora ultra thoracem bene projecta. Prothorax minus — 

 vel haud — transverse. 



I separate frorn Gouioryctus a number of species that are aberrant in forrn, 

 compared with other Nitidulidae of the group, inasmuch as they have more elongate legs 

 and a less abbreviate prothorax, which part is usually of remarkable form. In these 

 representatives the genus looks very distinct, but it is connected to Goniorychis to a 

 considerable extent by G. fugitivus and G.foveatus. G. conicicollis may be taken as the 

 type of the genus. In it the prosternal process is prolonged and prominent behind the 

 coxae, and the angle formed by the direction of its hinder face is nearly rectangular. 

 This is almost enough to constitute another genus as compared with G. inaequalis, but 

 I believe that intermediate forms as regards this character will be found in some of the 

 other species of the genus. 



(i) Goniothorax conicicollis, sp. nov. 



Nigricans, antennis pedibusque testaceis, fuscescentibus, abdomine fusco-rufo, 

 thoracis elytrorumque marginibus plus minusve rufescentibus : thorace subquadrato sed 

 anterius angustato, lateribus subrectis, angulis omnibus fere rectis. % Long. corp. 6|- mm. 

 lat. 2|-, long, prothoracis \\, lat. prothor. fere i|-, long, elytr. 2f mm. 



Plate XIII. fig. 18, %. 



In the female the pygidium is much narrowed towards the tip, where it is not 

 truncate but slightly notched in the middle, there is no tubercle on it, there is a 

 projecting tuft on each side of the notch, on the most prominent part. The last ventral 

 is not elongate, so that the tip of the pygidium (Plate XIII. fig. x'^b) can be very distinctly 

 seen on the lower surface ; the hind margin is slightly rounded, and there is a tuft of 

 hairs on each side of its middle, just corresponding with the tufts at the apex of the 

 pygidium. 



