Semanotus terminatus ( Casey, 1912 ) Casey, 1912

James Hammond, H. E. & Williams, Daryl J., 2013, Casey’s conundrum, a review of the genus Semanotus Mulsant (Coleoptera: Cerambycidae: Cerambycinae: Callidiini) in North America, Zootaxa 3670 (2), pp. 101-136 : 119

Semanotus terminatus ( Casey, 1912) , new status

( Figs 4 H, 11, 16I,J; Map 4)

Anocomis terminata Casey, 1912: 274 Anocomis canadensis Casey, 1924: 238

Material examined. 356 males, 320 females, 22 sex undetermined.

Holotype. Female ( USNM), examined; labelled “Me.// CASEY /bequest/1925// terminata Csy [hand written]// TYPE USNM /35921 [Red label]”.

Diagnosis. This species can be separated from other species of Semanotus by the following combination of characters: head, prothorax and abdomen dark brown; antennae light to dark brown, often with antennomere 1 darker; legs ranging in color from reddish-brown to dark brown, sometimes with femora contrastingly darker; elytra light to dark brown, sometimes with faint pale maculation; mandible with acute median tooth; elytra with one or multiple rows of dense medium to long, semi-erect to erect, golden setae, extending along suture from base to very near apex; labrum rectangular, short and wide; protibia narrow, not distinctly enlarged at apex; tibial apices with short sparse setae which do not obscure tibial spurs; elytra long and narrow; antennae short, usually distinctly shorter than elytral length in female; apical antennomeres 8–11 shorter and wider in males; male genitalia with tegmen apophyses cylindrical but slightly inflated apically, bulbous; tegmen basal ring is narrowly joined.

Hosts. Picea mariana (Mill.) B.S.P. (black spruce), Picea glauca (Moench) Voss (white spruce), Pseudotsuga menziesii (Douglas-fir), Larix sp. (tamarack).

Flower and Associated Vegetation Records. Abies concolor (white fir), Pinus contorta Dougl. (lodgepole pine), P. ponderosae Laws. (ponderosa pine), Larix sp., Salix sp.

Distribution. Transcontinental and higher elevation sites, from Alaska to Nova Scotia, south to Colorado.

Remarks. The mandible in the type specimen A. canadensis has only a remnant of the median mandibular tooth, with wear marks visible on the molar surface of the mandible.

This species is very similar to S. litigiosus , however, the overall habitus is longer and narrower, is often lighter colored and usually smaller in size. The elytral sutural flying hairs in this species tend to be longer, giving the elytra a somewhat pubescent keeled appearance. Eastern forms are relatively easy to separate as they tend to be smaller and more dull brown in color. In the west, this species is often larger than eastern forms, and is confused with teneral or lighter colored specimens of S. a. basalis due to the elytra sometimes having lighter banded or spotted areas of color, however the characters in the key should separate the two species.

There is a distinct population of this species in higher elevations of Wyoming and Colorado. The antennae tend to be longer in this population, but the elytra still tends to be longer and narrower and the coloration is more similar to eastern forms. Some specimens also have unusual bi-colored femora.

Figures

FIGURE 4. A. Pronotum of female S. amethystinus, B. Pronotum of female S. ligneus, C. Mandibles and labrum of female S. litigiosus, D. Mandibles and labrum of female S. ligneus, E. Elytral pubescence of female S. litigiosus, F. Elytral pubescence of female S. a. amplus, G. Pro- and mesotibia of female S. litigiosus, H. Pro- and mesotibia of female S. terminatus.