Coleopterous Fauna of Japan. 421 



Mandibulas robusta^, acuta?, apice incurvre. 



Maxillffi mala superiore dense barbata, interiore mem- 

 branacea, apice barbata. Palpi maxiUares filiformes, sat 

 elongati, articulo 2° primo paulo breviore, 3° primo paulo 

 longiore. 



CoxfB anticfB elongata?, transverste, sed vix promi- 

 nentes. 



Stigmata protlioracica occulta, prothoracis parte cornea 

 posteriore ab auteriore bene separata; acetabulis inter- 

 mediis profundis. 



Elytra elongata, metanoto multo longiora. 



Abdomen conicum, segmentis tribus dorsalibus per- 

 spicuis. 



Tibia3 longitudinaliter carinatte, breviter spiuulosa?. 



Tarsi quinque-articulati. 



This very remarkable insect should be placed in the 

 Piestini near Trigonurus. The anterior coxa3 are about 

 as prominent as in T. Mellyi, but the posterior side piece 

 of the thorax is well separated from the anterior portion, 

 leaving the coxce visible in the intervening space; the 

 structure of the tibio3 distinguishes it unmistakeablj from 

 Trigonurus. 



The mentum appears to have the anterior portion 

 membranaceous and retractile ; when it is extended the 

 anterior margin then appears prominent in the middle, 

 much as in Trigonurus. The insertion of the antenna3 is 

 just as in Trigonurus. 



Reiche in the " Annales de la Soc. Ent. France, 1865," 

 p. 642, has established a distinct group for the genus 

 Trigonurus, affirming that it is distinguished fi-om the 

 Piestides by its labrum not being furnished with lateral 

 appendages; but I find, on mounting the labrum of 

 T. Mellyi in Canada balsam, that these appendages are 

 very distinctly present, though unusually delicately 

 formed: and I see no sufficient reason why Trigonurus, 

 as well as Trggeeus, should not form part of the group 

 Piestides as at present understood; though it must be 

 admitted that the elongate elytra and pointed hind body 

 are exceptional characters for the group. 



Trygmis princeps, n. spec. Convexus, nitidus, nigri- 

 cans, antennarum basi tarsisque obscure rufescentibus ; 

 prothorace grosse punctato ; elytris profuude striato-puuc- 

 tatis. Long. 7 mm.; lat. 31 mm. 



