46 GEO. H. HORN, M. I). 



This species is the representative in our fauna of kolveiuis Sahib. 

 The hitter does not have the thorax constricted at base, but the me- 

 dian line is broad and the middle of the disc depressed below the 

 level of the sides as in stridus. 



Occurs from Canada to Pennsylvania. 



P. aiiiericauii!^ Kby., Faun. Bor. Am. iv, p. 165; deplanatus Mann., Bull. 

 Mosc. 1853, iii, p. 268. 



Beneath, legs and antenntie rufous, head and thorax piceous, elytra 

 somewhat paler, surface with a bluish or violet lustre. 



Varies with the elytra, or even the entire surface pale. 



This species represents, in our fauna, depressiis Linn., of Europe, 

 and may even be identical with it. 



The form described by Mannerheim is merely a i)oorly developed, 

 immature specimen ; similar have been seen. 



Occurs from Canada to North Carolina. 



P. iiiger Kby., Faun. Bor. Am. iv, p. 164. 



Black, shining, without metallic lustre ; legs black or brown. 

 In this species the underside may be paler, but nevei- as pale as in 

 americanm. 



Occurs from Canada to New England States. 



In the males of Pytho the antennie are longer than in the female, 

 joints 1-6 being very obviously longer than wide, 7-10 as wide as 

 long, 11 longer. In the female joints 1-5 are longer, 6-10 wider 

 than long, 11a little longer. In nearly all females the base of the 

 elytra is smooth, while in many males it is distinctly punctured. 



PYROCHROID^. 



DEIVDROIDES Latr. 

 The species are separable in the following manner : 



Thorax rather coarsely punctate. 

 Elytra piceous. 



%. Eamus of third antennal joint arising very near the distal end; last 



joint scarcely as long as the three preceding bi<*olor %. 



9 . Free angle of third joint distinctly prolonged ; last joint equal to two 



preceding bicolor 9 • 



Thorax smooth and shining. 

 Elytra piceous. 



% . Eamus of third joint arising near the distal end ; last joint as long as 



the five preceding pieipes % . 



Elytra testaceous. 



