AMERICAN PHILOSOPHICAL SOCIETY. 597 



oblique and dilated ; more or less tinged with cupreous ; an arcu- 

 ated, elevated line at the posterior angles ; posterior angles acute : 

 elytra with the basal indentation, subsutural spot behind the 

 middle, composed of minute prostrate hairs, producing a differ- 

 ent reflection from that of the general surface ; tip denticulate : 

 beneath blackish-brassy. 



Var. a. Dull cupreous ; thorax brighter. 



Length more than one-fifth of an inch. 



Distinguished by the elytral spots offering a different reflec- 

 tion from the remainder of the surface. In some positions they 

 are hardly obvious ; but seen from before or behind they are dis- 

 tinct, particularly the posterior one. 



10. A. PUTILLUS. — Thorax transversely indented before and 

 behind the middle ; elevated line of the posterior angle none. 



Inhabits Indiana. 



Body blackish-brassy : head greenish ; longitudinal impressed 

 line very distinct : thorax with a transverse indentation before, 

 a much larger transverse indentation behind the middle, and a 

 more profound lateral one parallel with the lateral margin ; pos- 

 terior angles destitute of an elevated line, retangular or rather 

 more obtuse ; elytra, basal indentation ovate-oblong, oblique ; tip 

 denticulated, from the suture to the middle concave; suture 

 rather prominent. 



Length over one-tenth of an inch. 



Only three of the before mentioned species are destitute of an 

 elevated line at the posterior thoracic angles, viz. the ruficollh, 

 hilineata and lateralis, to these we may add the cogitans Weber. 

 From all these the present is separable by its inferior size, ex- 

 cepting the lateralis, which has no denticulations at the tip of the 

 elytra. One of my specimens has the head green before. 



11. A. OTiosus.— Line of the thoracic angles short and ob- 

 tuse; front but slightly punctured. 



Inhabits Indiana. 



Body greenish, or brassy-blackish, rather slender : head with 

 the punctures obsolete, excepting on the vertex, where they are 

 not profound [164] or well defined; beneath the middle of the 

 front with short whitish hairs : thorax with two slight indenta- 

 1836.] 



