-6t>RSiowM;& Leaeh. 



Caput thorace obtectum. Antennae 9-articulatae, articulis duobus primis 

 elongatis crassis, 3'o et 4^0 minutis, 5* elongate, conico, 6^0 minuto, tribus 

 ultimis magnis, crassitie vix brevioribus ; tarsi liliformes, articulo 3io non 

 recepto, unguiculari longo, unguibus simplicibus. Corpus rotundatum convexum 

 glabrum. 



1. C. inarginicollis, rotundatus, niger nitidus, thorace basi obtuse 

 producto, lateribus et apice testaceo-marginato, elytris punctulatis, pedibus 

 flavis. Long. '03. 



Middle and Southern States, on leaves. Body rounded, convex, shining black. 

 Thorax semicircular, margin testaceous, base obtusely angulated in the middle, 

 posterior angles obtuse. Elytra strongly punctulate, a little rounded at the 

 apex. Legs yellow testaceous. 



2. C. truncatus, rotundatus, piceus, thorace testaceo basi truncate, 

 elytris subrugosis vix punctulatis, pedibus flavis. Long. -03. 



New York, under stones. Form and size of the preceding. Thorax testaceous, 

 sometimes darker on the disk ; posterior margin almost straight, posterior 

 angles acute a little produced. Elytra scarcely punctured, finely wrinkled. 

 Feet testaceous. 



Sericoderus Steph. 

 Gryphinus Redt. 



Caput thorace obtectum minutum. Antennae lO-articulatae, articulis 1 et 2 

 crassis, clava 3-articulata. Tarsi filiformes, articulo 3io minuto, non recepto, 

 unguiculari longo. Corpus ovatum convexum, pubescens, thoracis angulis 

 posticis productis, elytris postice angustatis apice truncatis. 



The English genus Sericoderus is described as having the antennal club three 

 jointed, but Corylophus too has the same structure, according to British autho- 

 rity. (Vide Westwood's Modern Classif. Insects.) Comparing other characters, 

 such as the form of the thorax and elytra, and above all the figure in Shuckard's 

 Illustrations of British Coleoptera, I find no reason why Redtenbacher's genus 

 should be retained ; however, we owe to him the first good description of the 

 genus. (Fauna Austr. 573.) 



1. S. flavidus, flavo-testaceus, flavo-pubescens, thorace macula antica 

 obscura notato, basi late sinuato, elytris subtilissime punctulatis. Long. -OS. 



New York and Lake Superior. Ovate, one-half longer than wide, uniformly 

 yellowish testaceous, densely pubescent. Thorax semi-circular, margined, 

 with a fuscous spot at the apex ; base broadly rounded in the middle, sinuate 

 each side, posterior angles moderately produced. Elytra very finely and 

 densely punctulate, very slightly narrowed to the apex, which is broadly trun- 

 cate. Pectus dusky. 



2. S. obscurus, rufo-piceus, flavo-pubescens, thorace lateribus rufis, 

 basi utrinque subangulato, elytris subtiliter punctulatis, apice pedibusque flavis. 

 Long. -025. 



One specimen, New York. Smaller than the preceding and a little narrower. 

 The thorax is more broadly rounded in the middle, and the posterior angles are 

 more produced, forming with the middle of the base a distinct angle. The 

 elytra are a little more narrowed behind, and seem more distinctly punctured, 

 the truncated margin is yellowish. Beneath dusky, feet and tip of the abdomen 

 yellowish. 



3. S. sub til is, flavo-testaceus, flavo-pubescens, thorace macula antica 

 obscura notato, angulis posticis valde productis, elytris punctulatis. Long. '02. 



Illinois, Mr. Willcox. Smaller and more convex than S. flavidus, with the 

 thorax not so transverse, and the posterior angles much more produced. The 

 elytra are more narrowed posteriorly and more distinctly punctured. The pectus 

 is scarcely darker than the abdomen. 



