Perissus

Subfamily

Cerambycinae

Diagnosis - adult

Body length: 5.5–11.5mm. 
Eyes: eye interommatidial setaeseta:
a sclerotized hair-like projection of the cuticle
absent, eye entire/shallowly emarginateemarginate:
notched at the margin
, eye ommatidial density fine. 
AntennaeAntenna:
in larval and adult insects, paired segmented appendages, borne one on each side of the head, functioning as sense organs and bearing a large number of sensilla
: antennal length barely surpassing pronotumpronotum:
the upper and dorsal part of the prothorax
or reaches between basebase:
the part of any appendage or structure that is nearest the body
and end of elytraelytron:
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
, antennal flagellar segments elongateelongate:
much longer than wide
, scapescape:
the first proximal segment of the antenna
smooth/punctate at apexapex:
end of any structure distad to the base
, antennal scapescape:
the first proximal segment of the antenna
≥ segment 3. 
Pronotumpronotum:
the upper and dorsal part of the prothorax
: pronotumpronotum:
the upper and dorsal part of the prothorax
shape subquadratesubquadrate:
not quite a square
or longer than wide, pronotumpronotum:
the upper and dorsal part of the prothorax
lateral armature absent. 
Prosternum: prosternal process dilated at apexapex:
end of any structure distad to the base
, procoxal cavities open posteriorly. 
ElytraElytron:
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
: elytral length reaching or close to end of abdomen, elytral apicesapex:
end of any structure distad to the base
emarginate or with tooth or spinespine:
a protuberance with an acute (sharp) distal end
, elytral color pattern present. 
Legs: visible tarsomeres: 4, femora clavateclavate:
thickening gradually toward the tip
, rarely slender, protibial spurs: 2, tarsal claws simple. 

Antennae more or less distantly inserted, intervening space fairly even; metepisternummetepisternum:
the episternal portion of the pleuron on the posterior thoracic segment
broad, 2–3 times as long as broad. Front of head lacking distinct carinaecarina:
an elevated ridge or keel, not necessarily high or acute
. AntennaeAntenna:
in larval and adult insects, paired segmented appendages, borne one on each side of the head, functioning as sense organs and bearing a large number of sensilla
more or less slender, with segments generally not toothed; prothorax generally longer than broad. First posterior tarsal segment generally at least twice as long as following two segments combined; posterior femora usually extending beyond elytral apicesapex:
end of any structure distad to the base
(Gressitt 1951Gressitt 1951:
Gressitt, J.L. 1951. Longicorn beetles of China. Longicornia, Paris 2: 1-667, 22 pls.
).

Similar genera

Pseudosphegesthes, Neoclytus

Differential diagnosis

In this genus there are no distinct carinaecarina:
an elevated ridge or keel, not necessarily high or acute
on the fronsfrons:
the upper anterior portion of the head capsule, usually a distinct sclerite between the epicranium and clypeus
or transversetransverse:
broader than long
carinaecarina:
an elevated ridge or keel, not necessarily high or acute
on the pronotumpronotum:
the upper and dorsal part of the prothorax

Distribution

eastern Palearctic, Indomalaya, Afrotropic: Congo, Australasia

Recorded host plants

broadleaf; Cupressus; Pinus

Remarks

87 spp. + 5 more subspecies. Conifers: P. parvulus Gahan (Makihara et al 2008).

Synonyms

Amauraesthes Chevrolat, 1863, Mémoires de la Société Royale des Sciences de Liège 18 (4): 327

Taxonomy

Perissus Chevrolat, 1863, Mémoires de la Société Royale des Sciences de Liège 18 (4): 262

  Perissus fairmairei  dorsal

Perissus fairmairei dorsal

  Perissus fairmairei  ventral

Perissus fairmairei ventral

  Perissus fairmairei  frontal

Perissus fairmairei frontal

  Perissus fairmairei  lateral

Perissus fairmairei lateral