Judolia Mulsant, 1863

The genus Judolia Mulsant, 1863 consists of 17 species worldwide, which are holarctic in distribution (see Ödikmen, 2011). According to Linsley and Chemsak (1976, p. 47) the genus can be distinguished from other North American lepturines "by the convex disk and acute hind angles of the pronotum, and usually short, stout body form, and by the proportions of the basal antennal segments" (Linsley and Chemsak, 1976, p. 47). In Judolia, the scape (1st antennal segment) is "usually longer than, or subequal to the third segment, fourth shorter than the third, and the outer segments subopaque."

Five species, and two additional subspecies are represented in the Pacific Northwest as follows (valid names are in bold, followed by synonyms):  

gaurotoides gaurotoides (Casey, 1893:592)
       vivarium Casey, 1924:282
       knulli Swaine & Hopping, 1928:46
gaurotoides auripilis Linsley & Chemsak, 1976:50
impura (LeConte, 1857:64)
instabilis (Haldeman, 1847:64)
       convexa LeConte, 1850:332
       quadrata; Horn, 1886:xiii (not LeConte, 1873)
       flaviventris Schaeffer, 1908:342
       pacifica Casey, 1913:249
       trajecta Casey, 1913:250
montivigans montivigans (Couper, 1864:87)
       sexmaculata; Kirby in Richardson,1837:182 (not Linnaeus, 1758)
       seminigra Casey, 1924:283    
montivigans barberi (Fall, 1907:250)
scapularis (Van Dyke, 1920:43)
       isabellae Hopping, 1922:162

[general statement on PNW Judolia] 

Key to Species in the PNW

Species potentially confused with Judolia:

Several other PNW lepturine genera contain species which closely resemble Judolia in their overall form and coloration. Stenostrophia tribalteata, Strophiona laeta, Xestoleptura tibialis, Dorcasina matthewsii. 

The typically dark form of Judolia montivigans barberi is externally similar in appearance to the PNW lepturines Brachysomida atra, Cortodera nitidipennis, Lepturopsis dolorosa, and Brachyleptura vexatrix. 

Notes

1. The northern range limit for J. scapularis Van Dyke was previously north-central California (see Linsley and Chemsak, 1976).  Westcott et al. (2006), reported a specimen taken in Jackson Co., Oregon on the highway I-5 near the California state line. 
2. Wikipedia page on the European species J. cerambyciformis (Schrank, 1781) provides basic life history information, citing Horion (1974) and Klausnitzer and Sander (1981).
3. The chromosome number of Judolia erraticus was determined to be 2n = 18. (Okutaner et al., 2012) 
4. The fossil species Leptura antecurrens Wickham, 1913: 295, described from the Miocene shales of Florissant, Colorado, is thought to belong to the genus Judolia (see Ödikmen, 2011). An image of the holotype is available at the Smithsonian website: http://www.elaphidion.com/default.asp?Action=Show_Types&Single_Type=True...

References

1. Casey, T. L. 1893. Coleopterological notices V. Ann. New York Acad. Sci., 7:281-606, 1 pl. 
2. Casey, T. L. 1913. Further studies amongst the American Longicornia. Memoirs on the Coleoptera, 4:193-388.
3. Casey, T. L. 1924. Additions to the known Coleoptera of North America. Memoirs on the Coleoptera, 11:1-347.
4. Couper, W. 1864. List of Coleoptera and Diptera taken at Quebec, and other parts of lower Canada. Trans. Lit. Hist. Soc. Quebec, (n.s.) 3:27-36.
5. Fall, H. C. 1907. Descriptions of new species. Transactions of the American Entomological Society, 33: 218-272. Link Biodiversity Heritage Library.
6. Haldeman, S. S. 1847. Material towards a history of the Coleoptera Longicornia of the United States. Trans. Amer. Philos. Soc., 10:27-66.
7. Horion, Adolf. 1974. Faunistik der mitteleuropäischen Käfer, Band XII: Cerambycidae – Bockkäfer. Überlingen.
8. Horn, G. H. 1886. Notes from the Museum at Cambridge. Trans. Amer. Entomol. Soc., 13: xi-xvi, 12 figs.
9. Kirby, W. 1837. The Insects. Coleoptera. In J. Richardson, W. Swainson, and W. Kirby, Fauna Boreali Americana; or the Zoology of the Northern Parts of British America: containing descriptions of the objects of natural history collected on the Late Northern Land Expedition, under the command of Captain Sir John Franklis, R. N. Norwich, Josiah Fletcher. 249 pp.
10. Klausnitzer, B. and F. Sander. 1981. Die Bockkäfer Mitteleuropas. Die Neue Brehm-Bücherei 499. A. Ziemsen Verlag, DDR Wittenberg Lutherstadt.
11. LeConte, J. L. 1857. In, Report of Explorations and Surveys to ascertain the most practicable and economical route for a railroad from the Mississippi river to the Pacific Ocean. Made under the Direction of the Secretary of War, in 1853-5, according to Acts of Congress of March 3, 1853, May 31, 1854 and August 5, 1854, 12:1-72, 2 pls.
12. Linsley, E.G. and J.A. Chemsak. 1976. Cerambycidae of North America. Part VI, No.2. Taxonomy and Classification of the Subfamily Lepturinae. University of California Publications in Entomology 80, 186 pp.
13. Mulsant, E. 1863. Histoire naturelle des Coléoptères de France. Longicornes. 2e. ed. Ann. Soc. Imp. Agric Hist. Nat. Industrie, Lyon, p. 1-590.
14. Okutaner, A. Y., Özdikmen, H., Yüksel, E., Koçak, Y., 2012. “Cytogenetic observations of Pachytodes erraticus (Coleoptera: Cerambycidae: Lepturinae: Lepturini). Florida Entomologist, 95 (3): 731-736 (2012) (SCI). http://dx.doi.org/10.1653/024.095.0323
15. Ödikmen, H. 2011. A propose for acception of a single genus as Judolia Mulsant, 1863 instead of the genera Judolia Mulsant, 1863 and Pachytodes Pic, 1891 (Coleoptera: Cerambycidae: Lepturinae: Lepturini) Munis Entomol. Zool. 6(2): 900-904.
16. Schaeffer, C. F. A. 1908. List of the longicorn Coleoptera collected on the Museum expedition to Brownsville, Texas and the Huachuca Mts., Arizona, with descriptions of new genera and species and notes on known species. Sci. Bull. Mus. Brooklyn Inst. Arts Sciences, 1(12):325-352.
17. Swaine, J. M. & R. Hopping. 1928. The Lepturini of America North of Mexico. Part I. Bull. Nat. Mus. Canada, (Biol. Serv.) (14)52:1-97, 13 pls.
18. Van Dyke, E. C. 1920. Description of new species of Cerambycidae from the Pacific coast of North America, with notes concerning others. Bull. Brooklyn Entomol. Soc., 15(2-3):33-48.
19. Westcott, R. L., J. R. LaBonte, G. L. Parsons & P. J. Johnson. 2006. New records and other notes for Oregon Coleoptera. Zootaxa 1142:1-33
20. Wickham, H.F. 1913. Fossil Coleoptera from Florissant in the United States National Museum. Proceedings of the United States National Museum, 45(1982): 283-303. http://www.elaphidion.com/PDF/Wickham_1913.pdf