Monochamus alternatus Hope, 1842
Length: 15–30mm.
Elytral length:width ratio: length > 2x width.
Face: shape wide rectangle; genagena:
the part of the cranium on each side below the eye
length shorter than lower eye lobelobe:
a rounded projection or protuberence
or subequal to lower eye lobelobe:
a rounded projection or protuberence
.
Pronotum: dense setaeseta:
a sclerotized hair-like projection of the cuticle
on dorsum of lateral spines present; maculaemacula:
a spot or mark
on pronotal disk: 2 connected, longitudinal or 2–4 dots present; posteromedial tubercletubercle:
a small knoblike or rounded protuberance
present; lateral erect setae:seta:
a sclerotized hair-like projection of the cuticle
:: only present posterior to spinespine:
a protuberance with an acute (sharp) distal end
.
Scutellum: dense and complete pubesence.
Elytra: Elytra:Elytron:
the leathery forewing of beetles, serving as a covering for the hind wings, commonly meeting opposite elytron in a straight line down the middle of the dorsum in repose
:l integument color orange to red or black; Elytra:Elytron:
the leathery forewing of beetles, serving as a covering for the hind wings, commonly meeting opposite elytron in a straight line down the middle of the dorsum in repose
:l maculae:macula:
a spot or mark
:: dense velvety pubescentpubescent:
downy; clothed with soft, short, fine, loosely set hair
patches present or pubescence forming narrow longitudinal lines; Elytra:Elytron:
the leathery forewing of beetles, serving as a covering for the hind wings, commonly meeting opposite elytron in a straight line down the middle of the dorsum in repose
:l sutural apexapex:
end of any structure distad to the base
rounded or dentate; elevation in basal third followed by impression absent; basal granulation dense and coarse; middle to apical punctationpunctation:
pits or depression of variable size in cuticle
fine.
Antennal length (female): >3.5 segments beyond Elytra:Elytron:
the leathery forewing of beetles, serving as a covering for the hind wings, commonly meeting opposite elytron in a straight line down the middle of the dorsum in repose
:l apexapex:
end of any structure distad to the base
.
Aedeagus: paramereparamere:
A pair of finger-like structures that are located where the male genitalia exits the abdomen.
mediobasal tooth present; apical tip (ventral view) slightly rounded; terminal segment absent; scleritesclerite:
any hardened plate of the body wall bounded by membrane or sutures; sometimes found floating in the internal sac of male genitalia
in internal sac: scleritesclerite:
any hardened plate of the body wall bounded by membrane or sutures; sometimes found floating in the internal sac of male genitalia
absent.
M. nigromaculatus, M. titillator, M. carolinensis
Can be distinguished from M. nigromaculatus by the brown-orange pubescentpubescent:
downy; clothed with soft, short, fine, loosely set hair
patches and reddish integument. The slightly divergentdivergent:
spreading out from a common base
, unarmed to weakly-dentate elytral suturesuture:
groove marking the line of fusion of two formerly distinct plates; the line of junction of elytra
, completely pubescentpubescent:
downy; clothed with soft, short, fine, loosely set hair
scutellum, and contiguouscontiguous:
so near together as to touch
longitudinal orange stripes will help distinguish from any similar Nearctic species.
southern mainland Asia: China, Laos, Vietnam, Korea; Taiwan, Japan
Abies, Larix, Picea, Pinus, questionable Cupressaceae and hardwood records (Titan DB 2022)
Two subspecies are present for M. alternatus: M. a. alternatus in southern mainland Asia and M. a. endai in Japan and southern South Korea including Jeju Island. Limited molecular evidence shows a specimen from China separates from Japan/South Korea with moderate support.
Monohammus tesserula White, 1858: 408
Monochamus alternatus endai Makihara, 2004: 17
