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Subfamily Scolytinae - Bark and Ambrosia Beetles

red-and-black bark beetle - Scolytus tiny beetle - Xyleborus conifer borer pupae bark beetle - Xylosandrus germanus Red Turpentine Beetle - Dendroctonus valens Scolytin beetle - Hylastes Pseudopityophthorus? Unknown Beetle 3 - Hylastes
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Longhorn, Leaf and Snout Beetles)
Superfamily Curculionoidea (Snout and Bark Beetles)
Family Curculionidae (Snout and Bark Beetles)
Subfamily Scolytinae (Bark and Ambrosia Beetles)
Other Common Names
Engraver Beetles
Remarks
Was traditionally considered a separate family.

Two tribes:
Hylesinini - anterior margins of elytra procurved, pronotum unarmed, head visible from above.(1)
Scolytini - anterior margins of elytra forming a straight line across body, pronotum in most, armed with granules or asperities on at least anterior third, head concealed from above.(1)
Works Cited
1.American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea
By Arnett, R.H., Jr., M. C. Thomas, P. E. Skelley and J. H. Frank. (eds.)