OF PUILADELPIHA. 119 



I change the name, as that of Knoch has been previously em- 

 ployed for a different species. 

 [Also a Tchphonis. — Lec. ] 



MALACHIUS Latr. 



1. M. TRICOLOR [Ante, 1, 107.] [183] 



2. M. MORiCEPS.— [Ante, 1, 108.] [184] 



3. M. NiORiPENNis. — [V. M. otiosus, ante, 1, 109.] 



4. IM. viTTATUs.— [Ante, 1, 108.] [185] 



5. M. CIRCUMSCRIPTUS. — Black ; thorax rufous each side ; 

 elytra margined with yellow. 



Inhabits Missouri. 



Body black; region of the mouth and ba.'^al joints of the an- 

 tennae beneath pale; thorax rosaceous, with a dilated spot attain- 

 ing both extremities : elytra margined all around, excepting at 

 base, with yellow : thighs pale at base : venter, segments edged 

 with whitish. 



Length less than three-twentieths of an inch. 



[Belongs to Anthocomus. — Lec] 



6. M. BiPUNCTATUS. — [Ante 1, 107.] [186] 



PTILINUS Fabr. Latr. 



1. P. RUFICORNIS. — Black ; antennae, tibia, and tarsi, rufous; 

 antenna? with much elongated processes. 



Inhabits Kentucky. 



Body black, immaculate, rugose with minute, slightly elevated, 

 acute tubercles ; head with a very slightly elevated longitudinal 

 line on the vertex : eyes black-brown : antennae, the processes 

 very much elongated and the joints short ; rufous : tibia and tarsi 

 rufous : elytra with numerous impressed punctures, which are 

 irregular near the base, and hardly arranged into striae near the 

 tip : thorax convex, elevated. 



Length three-twentieths of an inch. 



2. P. SERRicoLLis. — Blackish ; elytra chestnut, sericeous ; 

 feet pale. 



Inhabits Missouri. 



Blackish-brown, sericeous, punctured : head with minute, tu- 

 bercles : eyes deep black : antennae pale rufous ; seven secund an- 

 1823.] 



