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Tribe Prionini

Palo Verde Root Borer - Derobrachus hovorei Brown Prionid - Orthosoma brunneum - female Cucujus clavipes ? - Orthosoma brunneum What is this large bug?? - Prionus californicus Prionid/ Derobrachus (long horned beetle) - Derobrachus Prionus heroicus Tile-horned Prionus - Prionus imbricornis Palo Verde Root Borer - Derobrachus hovorei
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Longhorn, Leaf and Snout Beetles)
Superfamily Chrysomeloidea (Long-horned and Leaf Beetles)
Family Cerambycidae (Longhorned Beetles)
Subfamily Prioninae
Tribe Prionini
Identification
Partial key to genera (1), (other print references):
1-Robust, segments of antennae often overlapping, tips of apical segments produced into lobes ......... Prionus
2-Elongated, sides almost parallel; apex (tip) of each antennal segment simple:
2a-Antennomere 3 distinctly longer than 1 and 2 combined, about as long as 4 and 5 together (left) ......... Derobrachus
2b-Antennomere 3 equal in length to 1 and 2, shorter than 4 and 5 (right) ............................. Orthosoma
  Note: Antennomere (Antenna segment) 2 is greatly reduced in both.
  
Print References
Dillon and Dillon, p. 576 (1)
1996. Chemsak, A.J. Illustrated Revision of the Cerambycidae of North America. Vol. I, Subfamilies Parandrinae, Spondylidinae, Aseminae, Prioninae. Wolfsgarden Press, Burbank, ix+150pp., 10 pls.
1962. Linsley E.G. The Cerambycidae of North America. Part II. Taxonomy and classification of the Parandrinae, Prioninae, Spondylinae and Aseminae. Univ. Calif. Publ. Entomol., 19:1-102, 1 pl., 34 figs.
Works Cited
1.A Manual of Common Beetles of Eastern North America
By Dillon, Elizabeth S., and Dillon, Lawrence