Semanotus 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 : 122-124

Semanotus amplus ( Casey, 1912) , new status

Anocomis ampla Casey, 1912: 273

Holotype. Male ( USNM), examined; labelled “Cal.// CASEY /bequest/1925// TYPE USNM /35913 (Red label)// ampla /Casey [Hand written]”.

Diagnosis. This species can be separated from other species of Semanotus by the following combination of characters: antennae relatively long (3: usually reaching to at least ¾ elytra, often attaining or surpassing apex; Ƥ: usually reaching to at least mid-elytra), elytra ranging from completely black, completely orange, to various combinations of maculation, as either a median spot and dark apex or with base light and apical ½ dark; pubescence of elytra dark brown to black, decumbent; femoral club strongly globose clavate (3) to moderately clavate (Ƥ).

Hosts. Thuja plicata (western red cedar), Libocedrus decurrens (incense-cedar), Juniperus sp., Sequoia sempervirens (D. Don) Endl. (redwood).

Flower and Associated Vegetation Records. Pinus sp., Pseudotsuga sp., Chaemycparis nootkatensis (yellow cedar), Abies sp.

Distribution. West of the continental divide, from northern British Columbia to southern California.

Remarks. Phenotypically this species is highly variable across its range, and depends partly on host. Specimens reared from Libocedrus sp. tend to have a dark orange ground colour. Specimens reared from Cupressus sp. or Sequoia sp. tend to have a red ground colour. A series reared from Juniperus occidentalis near Redmond Oregon are small (<9mm), have yellow elytral ground colour and brown legs and antennae, but retain the dark pubescence typical for S. amplus .