Scaphinotus mannii

LaBonte, James R. & Kavanaugh, David H., 2022, Distinguishing Scaphinotus mannii Wickham (Coleoptera: Carabidae: Cychrini), a Species of Conservation Concern, from Similar Congeneric Species, Proceedings of the California Academy of Sciences 67 (12), pp. 301-314 : 303

Modified couplet 3 from Kavanaugh and Angel (2015) for distinguishing S. mannii from S. regularis and S. relictus

3a. Head longer and more slender, with eyes much less convex in dorsal view ( Fig. 4A ), labrum ( Fig. 5A ) with lateral lobes long and narrow, approximately twice as long as wide at the base; pronotum ( Fig. 6A ) narrow, widest at or near middle, with anterior angles little projected anteriorly beyond the median anterior margin and narrowly rounded; elytral striae ( Fig. 7A ) shallowly impressed and regular, with punctures in striae small and with most of them separated from each other by at least several times their own diameter.................................................................... Scaphinotus mannii Wickham

3b. Head shorter and broader, with eyes much more convex in dorsal view ( Figs. 4 B-C), labrum ( Figs. 5 B-C) with lateral lobes shorter and broader, no more than about 1.5 times as long as wide at the base; pronotum ( Figs. 6 B-C) broad, widest distinctly anterior to middle, with anterior angles slightly to distinctly projected anteriorly beyond the median anterior margin and broadly rounded; elytral striae ( Figs. 7 B-C) deeply or very deeply impressed and regular or irregular, with punctures in striae larger and closer together, more-or-less coalescent in some striae.................................................................... 4

Figures

FIGURE 4. Head, dorsal view. A. Scaphinotus mannii Wickham (Steptoe Canyon, Whitman Co., Washington); B. S. regularis (LeConte) (9 km SSE of Lowell, Idaho County, Idaho); C. S. relictus (Horn) (Cold Creek Canyon, Columbia County, Washington).

FIGURE 5. Labrum, dorsal view. A. Scaphinotus mannii Wickham (Steptoe Canyon, Whitman County, Washington); B. S. regularis (LeConte) (9 km SSE of Lowell, Idaho County, Idaho); C. S. relictus (Horn) (8 km SE of Craigmont, Lewis County, Idaho).

FIGURE 6. Pronotum, dorsal view. A. Scaphinotus mannii Wickham (Steptoe Canyon, Whitman County, Washington); B. S. regularis (LeConte) (9 km SSE of Lowell, Idaho County, Idaho); C. S. relictus (Horn) (8 km NNE of Moscow, Latah County, Idaho).

FIGURE 7. Left elytron, dorsal view. A. Scaphinotus mannii Wickham (Steptoe Canyon, Whitman County, Washington); B. S. regularis (LeConte) (9 km SSE of Lowell, Idaho County, Idaho); C. S. relictus (Horn) (8 km NNE of Moscow, Latah County, Idaho).