COLEOPTERA 257 



The robust after-body and general appearance led me to suppose that the species is 

 winged ; but examination shows the contrary, the wings being as completely vestigial as 

 they are in all the other species of this group of genera. 



Hab. Molokai. On the boggy plateau below the densest forest, about 4000 ft. 

 (Perkins). 



Thriscothokax, gen. nov. 



Prothorax utrinque seta unica, paulo ante medium lateris sita. Alae vestigiales. 

 Type T. unctiis. 



Like Mecyclothorax this is a most difficult complex to tabulate ; but the following 

 key may help any one wishing to determine species of it. 



1. ThoraK cordate (i.e. with a distinct constricted basal part and sharp hind angles, 



Plate VII. fig. 3), the base usualh- narrow species i — 13. 



2. Thorax not cordate, shorter and usually broader ; the true base of the elytra 



(i.e. the part between the incurv'ed lateral margins of the two sides) and base 

 of the thorax narrower than in group 4 ; hind angles sometimes (not always) 

 obtuse species 14 — 21. 



3. Species difficult to place ; base of thorax moderately broad, without neck, hind 



angles obtuse or very nearly so species 22 — 24. 



4. Base of thorax comparatively broad ; robust and comparatively large insects ; 



width of elytra across shoulders considerable species 25 — 29. 



(i) Thriscoflwrax 7tiicf?is, Blackburn. 



Cyclothorax 7inctiis Blkn., Ent. Mo. Mag. xvii. 18S1, p. 227. 



This species has in most individuals a slight brassy tinge on the upper surface, the 

 elytral margins are strongly elevated and always yellow, the thoracic elevated margins 

 are generally yellowish. There is but little variation in the shape and form of the 

 thorax, which is transverse, abruptly narrowed and constricted behind, with very definite, 

 rectangular hind angles. The striation is rather variable ; the sutural stria is present, 

 and behind is moderately deep, in front it is often distinctly punctate, the more external 

 striae are always indistinct, and they also may, one or two of them, be punctate; very 

 rarely can more than four striae be seen, on each wing-case. The length is 4^; to almost 

 5 mm. About 100 specimens. 



Hab. Maui. Haleakala (Blackburn). Haleakala, 4500 — 6000 ft., on several 

 occasions (Perkins). 



(2) Thriscothorax Jilipcs, sp. nov. 



Niger, parum convexus, elytris subviridescentibus, antennis, palpis pedibusque 

 flavis ; prothorace minus fortiter transverso, lateribus rotundatis, ad basin constricto ; 

 elytris levissime striatis. Long. 5 — 5:|; mm. 



Similar to T. uiicfus, but quite distinct by its longer thorax, which is much less 

 narrowed behind the middle. The basal constricted part of the thorax is rather long, 



33—2 



