492 FAUNA HAWAIIENSIS 



almost truncate, supplementary segment scarcely emarginate. In the two specimens, 

 the posterior, almost vertical, face of the prosternal process is hollowed so that it bears a 

 very shallow depression. This condition has not been observed in any other species. 

 We have two specimens, both males. 



Hab. Molokai, 4500 ft. (nos. 157, 181, Perkins). H. S. 



Nesopetinus, gen. nov. 



Prosternum post coxas leniter curvatum. Elytra margine externo baud explanato. 



The characters by which this genus is distinguished from Nesopeplus have been 

 given under that genus. 



Nesopetimis includes a variety of forms. The type is a remarkably flat insect. 

 N. blackburni, filipes, and concoloT- are very distinct forms, and N. tinchis connects the 

 genus with Gotiioryctus. 



The species do not lend themselves to any form of tabulation. All that can be 

 done is to indicate several rather vague groups; and even then a number of species 

 remain, which cannot be placed in these, and are also too distinct from one another to 

 form a natural group by themselves. 



Group 1. Flattened forms. Thorax distinctly transverse, not strongly convex, 

 closely punctured, lateral margins not (or at most, in no. 2, N. gonioryctoides, extremely 

 slightly) sinuate before the hind angles. Male pygidium at most slightly sinuate apically, 

 with very blunt rounded angles. Species i — ^10. 



Group 2. Smaller forms, usually very distinct from one another. Lateral margins 

 of thorax not sinuate before the hind angles. Apex of male pygidium ranging from 

 shallowly sinuate with very blunt angles, to conspicuously notched with sharp projecting 

 angles. Species 11 — 21. 



Group 3. Colour dark. Thorax longer, narrower, less closely punctured, with 

 hind angles definite and sides slightly sinuate before them. Apex of male pygidium 

 sinuate or shallowly emarginate, the angles not forming sharp teeth. This group may 

 be further divided : — 



A. Duller, pubescence distinct. Species 22, 23. 



B. Strongly shining, black, devoid of pubescence. Species 24. 



Group 4. Female pygidium very narrow, long, tapering, and somewhat convex 

 transversely. Male pygidium notched, the angles forming definite teeth. Species over 

 4 mm. long. .Species 25. 



