Geodephagous Coleoptera of Japan. 243 



variety in which the interstices are nearly equally con- 

 vex throughout the elytra, near the suture as well as on 

 the sides, as they are in .1/. Japonicus. 



Trigonognatha cuprescens, Motschulsky. 



Motschulsky, Etud. Ent., 1857, p. 26. 



Nikko, Kashiwagi, and Sado. Motschulsky's speci- 

 men was from Simoda. 



Chaudoir erroneously referred this genus to Triplo- 

 genius. It is widely distinct from the subgroup to which 

 Triplogenius belongs, and in fact is much nearer Myas, 

 the North-American species of which it much resembles.* 

 The mentum is deeply emarginated, with a broad trun- 

 cated tooth ; the labial palpi have the penultimate joint 

 bisetose. Mr. Lewis' specimen does not very well agree 

 with Motschulsky's description, though I agree with him 

 in thinking it very likely belongs to the same species. 

 It is scarcely depressed, and the elytral striae are dis- 

 tinctly punctulated, not " impunctatis." 



Trigonognatha aurescens. 



Minor, nigra, collo, thorace elytrisque splendide seneis, 

 subauratis, marginibus iridescentibus, palpis apice runs ; 

 thorace quadrato, antice leviter rotundato, postice gra- 

 datim, modice, sinuato-angustato, angulis posticis rectis, 

 margine incrassato, laterali postice crenato, basi de- 

 presso foveaque utrinque magna profunda extus (ante 

 angulum) carina margini parallela delimitata ; elytris 

 convexis profunde striatis, striis punctulatis. Long. 

 15 mm., $ , ? . 



Niohozan, under stones, October; and one example 

 from Chiuzenji. 



* The North-American species, Myas coracinus, Say, and 

 foveatus, Lee, are much nearer, in the form of the thorax, tooth 

 of the mentum, and in their submoniliform antennae, to Trigon- 

 ognatha than to Myas. The following is a magnificent species of 

 the same genus from China, not yet described : — Trigonognatha 

 princeps. Maxima, oblonga, lata, nigra, thorace margine purpureo, 

 elytris igneo-cupreis, marginibus viridi-auratis ; thorace transverso, 

 subcordato-quaclrato, postice modice sinuato-angustato; angulis 

 rectis, fovea basali utrinque angusta, profunda, extus carina obtusa 

 marginata ; elytris subtilissirne rugulosis nee politis, striis fundo 

 punctulatis, interstitiis valde convexis ; ante apicem abrupte et valde 

 emarginatis (mas) ; corpore subtus impunctato. Long. 33 mm. 

 Prov. Quang-tung, China. 



