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Species Grammoptera haematites

Grammoptera haematites  (Newman) - Grammoptera haematites flower longhorn? - Grammoptera haematites Flower Longhorn - Grammoptera haematites Lepturinae - Grammoptera haematites Unknown beetle - Grammoptera haematites beetle - Grammoptera haematites Grammoptera haematites flower longhorn beetle - Grammoptera haematites
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles)
No Taxon (Series Cucujiformia)
Superfamily Chrysomeloidea (Long-horned and Leaf Beetles)
Family Cerambycidae (Long-horned Beetles)
Subfamily Lepturinae (Flower Longhorns)
Tribe Lepturini
Genus Grammoptera
Species haematites (Grammoptera haematites)
Explanation of Names
Grammoptera haematites (Newman 1841)
haemato - Greek 'blood'(1)
Size
4-7 mm(2)
Identification
Typical form has dark elytra, orange pronotum and front femora. Yanega (2) notes "head is black except for the clypeus, and the basal antennal segments and legs are mostly reddish (scape reddish beneath)". That source also notes the pale hairs on elytra and pronotum.
 

The dark form (below) is often confused with G. subargentata (see comment here). The dark form appears to be more common in northern populations (2).
 
Range
transcontinental in the north, west to TX in the south
Season
Apr-Jul(2)
Food
Larvae feed on various shrubs(2)
Remarks
Perhaps a Batesian mimic of Oedemeridae (False Blister Beetles), such as Asclera:
- - >

Oedemeridae are known to have strong chemical defenses, including cantharidin (3).
Works Cited
1.Dictionary of Word Roots and Combining Forms
Donald J. Borror. 1960. Mayfield Publishing Company.
2.Field Guide to Northeastern Longhorned Beetles (Coleoptera: Cerambycidae)
Douglas Yanega. 1996. Illinois Natural History Survey.
3.American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea
Arnett, R.H., Jr., M. C. Thomas, P. E. Skelley and J. H. Frank. (eds.). 2002. CRC Press LLC, Boca Raton, FL.