1866.] MR. H.W. BATES ON FORMOSAN COLEOPTERA. 353 



black in both. The antennae in both sexes of P. swinhoei are longer 

 than the body ; the thorax is scarce perceptibly narrowed behind ; 

 and the elytra taper towards the apex extremely little in either sex ; 

 the spots on the disk of the thorax are large and nearly semicircular, 

 being separated by a narrow line ; the deflexed margins of the elytra 

 have a black streak between the second and third black spots. There 

 is a small black patch on the occiput ; otherwise the head is wholly 

 light green. 



Phytophaga. 

 Lema postrema. 



Oblonga, ferrugineo-flava ; antennis (articulo basali excepto), tibiis 

 apice et tar sis nigris, elytris cceruleis ; thorace medio valde an- 

 gustato, sulco dorsali obsoleto, foveoJa prope marginetn posticum 

 impresso, supra sparse distincte punctata ; elytris oblongis, pone 

 scutellum transverse depressis, lateribus subplicatis, punctis validis 

 in seriebus decern ordinatis, interstitiis Icevibus ; corpore subtus 

 nudo. 



Long. 3 i lin. 



Lamprosoma alienum. 



Parvum, breviter ovatutn, modice convexum, nigrum, nitidum, gla- 

 brum, supra regulariter haud profunde punctatum ; occipite paulo 

 convexo ; fronte subplana, Icevi, linea tongitudinali impressa ; an- 

 tennis prothorace brevioribus, nigris, articidis duobus basulibus 

 magnis, 3 t0 -6 tum tenuibus, cceteris gradatim incrassatis ; thorace 

 ante scutellum producto acuto, scutello latiusculo triangulari ; cor- 

 pore subtus pedibusque nigris nitidis, prosterno medio angustato. 

 Long. ]■!■ lin. 



This is one of the most interesting insects in the collection, being 

 the only Asiatic species at present known of a genus almost peculiar 

 to America. The only exception to the purely American range of 

 the genus hitherto made known was the European L. concolor. The 

 present species is more nearly allied to the typical forms of Lampro- 

 soma than that insect, having the median projection of the hind 

 margin of the thorax more pronounced and pointed. The scutellum, 

 however, is broader than in the Lamprosomce, forming nearly an 

 equilateral triangle, and plane on the surface. The antennse are 

 shorter than the prothorax, and gradually clavate from the sixth 

 joint. The prosternum is formed as in the Lamprosomata, but is 

 much narrower than is customary. 



Chlamys formosana. 



Pa)-va, breviter oblonga, castanea, corpore subtus nigro opaco ; capite 

 crebre grosse punctata, fulvo ; antennis basi fulvis ; thorace ele- 

 vato, elevatione simplici, rotundata,utrinque a limbo postico-laterali 

 distincte separata, crebre grosse punctata, disco antice lineis non- 

 nullis brevibus elevatis, colore nigro, fulvo et rufo-castaneo varie- 

 gato ; scutello nigro ; elytris grossissime punctato-rugulosis , costis 

 transversis flexuosis irregularibus utrinque circa 8, colore rufo- 



