48 AMERICAN COLEOPTERA. 



impressions usually more or less bistriate, unistriate iu hoivditchi, 

 and the base truncate, obliquely so each side. Elytra with the 

 humeri subangulate, with a more or less well-defined carina extend- 

 ing to the fifth stria ; strife entire, the eighth distant from the mar- 

 gin ; third interval not wider than the others, with two small dorsal 

 punctures placed near the third stria ; the quadrate fove^e observed 

 in the last group are here absent. 



The two groups are closely allied, Duval (Ann. Soc. Ent. France, 

 1851, ser. 2, ix, p. 452j, in fact, regarding them as one, the present 

 being the equivalent of the second section of his group ii. 



Our species, six in nuniber, are closely related. It is hoped the 

 following table will assist in their separation : 



Thorax wider at base thau apex. 



Elytra very deeply striate, the striae ahuost crenulately puuctate. 



Broad, slightly convex; bronzed, shining; head finely alutaceous; thorax 

 one-half wider than long, sides not sinuate behind, hind angles sub- 

 obtuse ; elytra slightly wider than the thorax, widest about one-fourth 

 fi'om base; legs seueo-ferruginous, the femora darker. Length .24-. 26 



inch rarinatuiu Lee. 



More elongate, convex; bronzed or black, less shining; head and thorax 

 alutaceous. the latter less thau one-half wider thau long, sides sinuate in 

 front of the hind angles, which are subitcute ; elytra about one-third 

 wider than the thorax ; legs seneo-piceous, the tibia; slightly paler. 

 Length .24-.27 inch »iculptiii*atuui Mots. 



Elytra moderately deeply striate, the stria rather finely puuctate. 



Robust; bronzed, shining: thorax nearly twice as wide as long, sides arcuate 

 in front, sinuate behind, hind angles acute; elytra about one-half wider 

 than the thorax; legs rufo-piceous, slightly jeneous, the femora rufous 

 at base. Length .23-.25 inch robusticolle n. sp. 



Elytra finely striate, the striae finely puuctate. 



Slightly depressed ; dull black or feebly bronzed, the surface alutaceous, not 

 shining; thorax scarcely one-half wider thau long, sides sinuate behind, 

 basal impressions unistriate, hind angles acute, divergent, prominent: 

 elytra about oue-tialf wider than the thorax ; .egs black, slightly a-ueous. 



Length .22-.24 inch bowdilvhi Lee. 



Thorax not wider at base than apex. 



Feebly convex; bronzed varyiug to bluish black, shining; thorax about one- 

 half wider than long, sides moderately arcuate in front, siuuate behind, 

 hind angles slightly prominent, subacute ; elytra deeply striate, the striae 

 deeply punctate ; legs aeneo-piceous, the femora at base and the tibiae 

 rufous. Length .22-.26 iuch coxeiidix Say. 



More convex; bronzed, usually coppery, elytra with the discs obscurely testa- 

 ceous; thorax scarcely one-half wider than long, sides arcuate nearly to 

 base, feebly sinuate in front of the hind angles, which are sub-rectangular ; 

 elytra moderately deeply striate, the striae distinctly punctate, the punc- 

 tures usually greenish ; legs testaceous. Length .18-. 27 inch. 



coiif'usiiin Nobis. 



