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Show 392 MR. H. W. BATES ON NEW COLEOPTEROUS [June 18, metasternoque apice argenteo-maculatis. Antennce dimidio corporis fere cequales : thorax antice et postice constrictus, medio transversim quadratus et convexus : elytra basi thorace fere duplo latiora, postice gradatim leviter angustata, costis utrinque tenuissimis et parum elevatis duabus, fascia flava nuda sed opaca cage rugosa: tibice posticee subrectce, com- •pressee, gradatim leviter dilatatce. Long. 37 millim. 2 • A single example. GAURESTHES, nov. gen. Gen. Helymseo (Thorns.)affinis. Corpus elongatum, elytris supra sub planatis, post medium paullo dehiscentibus. Caput antice sat elongatum, mandibulee elongatee, rectee; maxillee exsertce. Antennce (c??) dimidio corporis paullo longiore, ante apicem gradatim incrassatce, articulis 8°-l 1"' iterum angustatis, scapo curvato articulo 3" valde elongato. Thorax breviter sub-cylindricus, lateribus utrinque tuberculo lato conico. Elytra thorace dimidio latiora elongata fereparallela, apice latissime rotundata,supra utrinque tenuiter bicostulata. Femora clavata, postica elongata (elytrorum apicem perparum longiora) ; tibice posticee post medium paullulum curvatee compressee, mediocriter dilatatce; tarsi articulo basali duobus sequentibus conjunctis subcequali. Scutellum apice acutum, prolongatum. Among the few genera of Callichromince with clavate and petiolated femora this new form approaches the African and Arabian Helymceus much nearer than the Malayan Lpothalia. It differs from Helymceus in the three apical joints of the antennse being gradually narrower with the terminal one obtuselv acuminated, in the long straight mandibles, and in the different form and punctuation of the thorax. GAURESTHES RUFIPES. Nigro-violaceus, subnitidus, cum plagis opacis, pedibus (tibiis posticis cyaneo-violaceis exceptis) rufis : thorace disco antico basique medio impunctato polito, ccetera superficie creberrime subtiliter scabrosa et nigro-opaca, lateribus argenteo-sericeis scutello subtiliter scabroso viridescente opaco, linea medio polita : elytris subtilissime punctulato-scabrosis, opacis, sicut velutinis, humeris fasciaque lata ante-mediana sparsius punc-tato- scabrosis, subnitidis : subtus chalybeus, argenteo-sericeus. Long. 28 millim. 31 One example only. EUSYNTHETA, nov. gen. Gen. Achthophorse eerie affinis,sed valdediffert antennisbrevibus, robustis, articulis 4°-l 1"' brevissimis. Breviter oblongo-ovata. Frons trapezoidalis, oculis nullo modo prominentibus. Tuberes antenniferi approximati, paullulum divergenles nee armati. Antennce ( $ ?) robusti, capite cum thorace paullo lonqiores, subtus sparsim breviter ciliata1; scapo elongato-conico, cicatrice |