1880.] ^>'^ [Horn. 



38. A. laetus Dej. Oblong, modei-ately elongate, parallel, piceous'with 

 aeneous metallic surface lustre, narrow margin of thorax and elytra and legs 

 testaceous. Head smooth, clypeus with one setigerous puncture on each 

 side. Thorax broader than long, sides regularly arcuate, hind angles dis- 

 tinct, base a little wider than apex, margin narrowly depressed and pale, 

 disc slightly convex with few punctures near the base, basal impressions 

 distinct but feeble. Elytra rather broadly striate, intervals flat, smooth, 

 more shining in the male, apex feebly sinuate, side margin narrowly and 

 €pipleur8e pale. Body beneath smooth, shining, piceous, abdomen somewhat 

 paler. Length .32 — .34 inch ; 8 — 8.5 mm. 



The male has the anterior tarsi rather broadly dilated, the first four joints 

 pubescent beneath, the first at tip only, middle tarsi feebly dilated, the first 

 joint with a small pubescent space at tip, the next three fully pubescent. 



In the female the tarsi are all slender. 



Occurs in southern New Jersey, Georgia and Texas. 



29. A. coenus Say. Oval, form. oH rusticus, piceous, moderately shining, 

 surface with feeble metallic lustre. Head smooth. Thorax broad, nar- 

 rowed in front, sides moderately arcuate, hind angles rectangular, side 

 margin very narrowly depressed in front, more widely posteriorly, disc 

 moderately convex, basal impressions broad and shallow and sparsely punc- 

 tulate. Elytra striate, intervals flat, smootli, more shining in the male, 

 apex feebly sinuate, epipleurje usually paler. Body beneath smooth, 

 piceous. Femora piceous, tibiae and tarsi paler. Length .32 inch ; 8 mm. 



Sexual characters as in laetus, except that the first joint of middle tarsi of 

 male is entirely glabrous beneath. 

 Occurs in the Middle States region. 



30. A. amaroides Lee. Oblong oval, piceous, moderately shining, sur- 

 face with feeble metallic lustre, violaceous to greenish. Head smooth. 

 Thorax broader than long, narrower at apex, sides in front moderately 

 arcuate, posteriorly straight, parallel, hind angles sharply rectangular, 

 margin narrowly depressed, more widely posteriorly, disc moderately 

 coarsely sparsely punctulate in front, more densely at base, basal impres- 

 sions moderately deep. Elytra striate, intervals flat, smooth, more shining 

 in the male, apex distinctly sinuate. Body beneath piceous. Intercoxal 

 process and sides of metasternum punctate. Legs piceous. Length .86 — 

 .46 inch ; 9 — 11.5 mm. 



The sexual characters are as in laetus, the first joint of middle tarsi ^f 

 having a very small trace of pubescence at tip. 

 Occurs in California in the central vallej''. 



C — b, sericeus Group. 



Species oblong, black, opaque, densely punctulate, finely pubescent. 

 Terminal spur of anterior tibite slender, Posterior tarsi slender, nearly 

 as long as the tibite, the first joint as long as the next two. Elytra sinuate 

 at tip, striate but without distinct dorsal puncture. 



