Semanotus amplus amplus ( 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 : 124-126

Semanotus amplus amplus ( Casey, 1912) , new status

( Figs 5 G, 6D,E,F, 13A, 14, 16E; Map 7)

Anocomis ampla angusta Casey, 1912: 273

Anocomis ampla obliviosa Casey, 1924: 237 Anocomis ampla terracensis Casey, 1924: 237

Material examined. 294 males, 253 females, 88 sex undetermined.

Diagnosis. This subspecies can be separated from other subspecies of S. amplus by the following combination of characters: head, pronotum, and abdomen dark brown to black; antennal scape light to dark brown, usually contrasting with remaining antennomeres which are light brown to orange; femur dark brown and contrasting with tibia and tarsomeres which are light brown to orange; elytra light to dark orange, rarely red, with small to medium round to ovoid median black spot, 1/3 of apex black; elytral disk pubescence unicolour black, somewhat decumbent; ventral body and leg pubescence white to grey, moderately dense and long, usually not dense enough to obscure surface; elytral base and humeral angle orange, humeral angle short, usually less than ¼ of elytra making the elytra appear flat and wide.

Hosts. Libocedrus decurrens (incense-cedar), Thuja plicata (western redcedar), Juniperus occidentalis (western juniper), J. scopulorum (Rocky Mountain juniper), Sequoia sp.

Flower and Associated Vegetation Records. Pinus sp., Chaemycparis nootkatensis (yellow cedar), Abies sp. Distribution. Southern California north to central British Columbia, Pacific Coast east to continental divide. Remarks. There seems to be a color cline in this subspecies, with southern populations tending to be lighter orange and northern populations becoming dark orange to almost red. Also, specimens from Libocedrus and Thuja tend to be dark orange with dark grey highlights, whereas, specimens from Juniper tend to be a lighter orange. In California this species may be bivoltine, as there appears to be two distinct adult activity periods, one from March to early May, and another from late August through to mid-September.

Figures

FIGURE 5. A. Pronotum of male S. australis, B. Mandibles of male S. australis, C. Pronotum of male S. a. sequoiae, D. Profemur of male S. japonicus, E. Profemur of S. a. sequoiae, F. Elytral pubescence of female S. ligneus, G. Elytral pubescence of female S. a. amplus.