1806.] MR. H.W. BATES ON FORMOSAN COLEOPTERA. 349 



quam 4 tus multo minoribus : thorace elongato-quadrato, medio 

 vix ddatato, angulis anticis et posticis late truncatis, supra 

 convexo, profunde punctato, nigro, fulvogriseo squamoso, ma- 

 culis duabus rotundatis et vitta abbreviata longiludinali uudis ; 

 elytris a medio subabrupte angustatis, striato-punctatis, inter- 

 stitiis punctulatis, rufo-castaneis, fulvo-griseo nebulose squa- 

 matis ; corpore subtus fuliginoso, rugoso, griseo squamato ; pe- 

 dibus piceis. 

 Long. 9 lin. 

 This species is remarkable in the genus to which it belongs for the 



setose clothing of the upper surface of the body. It is one of the 



most peculiar insects in the collection. 



Melanotus umber. 



Modice elongatus, convexior, fuliginosus, subnitens, pube *uureo- 

 fulva subdecumbente minus dense vestitus ; capite parvo, supra 

 convexo, crebre punctato, nitido, carina frontali fortiter cur- 

 vat a ; antennis piceo-rufis ; pedibus pallide rufis ; thorace valde 

 convexo, dense nee grosse punctato, lateribus antice modice ro- 

 tundatis ; ehjtris minus nitidis, aspere punctulatis, fortiter 

 punctato-striatis ; corpore subtus concolori. 



Long. 7 lin. 



Melanotus tamsuyensis. 



Elongatus, depressus, piceo-fuliginosus, subnitens, pube grisea 

 suberecta minus dense vestitus; capite supra grosse crebre 

 punctato, carina frontali late rotundata, epistomate cum labro 

 fuliginosis, palpis piceo-rufis; antennis omnino fusco-piceis ; 

 pedibus piceo-rufis ; thorace lateribus subrectis, antice paulo 

 angustato, supra vix convexo crebre punctato ; elytris striato- 

 punctatis, interstitiis punctulatis ; corpore subtus piceo-fuligi- 

 noso. 



Long. 7| lin. 



SlLESIS MUTABILIS. 



S. absimili vicina, colore variabilis, testacea cum thoracis disco 

 nigricante, vel brunneo-testacea, vel obscure fusca thoracis an- 

 gulis posticis solum obscure teslaceis, vfl denique tota nigro- 

 fusca ; pube grisea decumbente vestita, nihilominus nitida : 

 capite thoraceque dense p>unctatis ; elytris punctato-striatis, 

 interstitiis punctulatis ; pedibus rufo-testaceis ; antennis piceis, 

 articulis basalibus rufis. 

 Long. 2|-3 lin. 



Much resembles S. absimilis (Cand. Mon. Elater.), a Hong Kong 

 species ; differs in being more slender and very variable in colour. 

 There are a dozen specimens in the collection, no two of which are 

 alike in respect of colour. The pubescence is not very dense ; and 

 the surface is shining, especially the disk of the thorax, which is very 

 glossy. 



