Oeme

Subfamily

Cerambycinae

Diagnosis - adult

Body length: 6–22 mm.
Eyes: eye interommatidial setaeseta:
a sclerotized hair-like projection of the cuticle
present, eye deeply emarginateemarginate:
notched at the margin
> half width, eye ommatidial density coarse.
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 reaching/surpassing end of body, 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 segment 3 > scapescape:
the first proximal segment of the antenna
.
Pronotumpronotum:
the upper and dorsal part of the prothorax
: pronotumpronotum:
the upper and dorsal part of the prothorax
shape transversetransverse:
broader than long
or subquadratesubquadrate:
 not quite a square
, pronotumpronotum:
the upper and dorsal part of the prothorax
lateral armature absent.
Prosternum: prosternal process not 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
rounded or truncatetruncate:
cut off squarely at the tip
, elytral color black, brown, reddish, or orange, elytral color pattern absent.
Legs: visible tarsomerestarsomere:
subdivision or article of the tarsus, usually numbering from two to five
: 4, femora slender, protibial spurs: 2, tarsal clawstarsal claw:
usually paired claws of the pretarsus, at the distal end of the leg
simple.

Form elongateelongate:
much longer than wide
, slender, depressed; integument thin. Head short; palpi very unequal, with apical segment feebly dilated; 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
longer than body in male, segments 3 to 5 usually armed with acute tubercles beneath, approximately as long as body in female; eyes deeply emarginateemarginate:
notched at the margin
, embracing insertion of 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
. Pronotumpronotum:
the upper and dorsal part of the prothorax
 usually about as long as broad with a broad tubular constriction, sides rounded or subparallel, without spines or tubercles, surface shallowly, irregularly punctatepunctate:
set with fine, impressed points or punctures appearing as pin-pricks
; anterior coxae prominent, intercoxal process of prosternum extremely narrow, laminiform, prolonged behind coxae; metepisterna broad in front, narrowed to a point behind. 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
elongateelongate:
much longer than wide
, parallel-sided, feebly costate; apicesapex:
end of any structure distad to the base
rounded (Linsley 1962Linsley 1962:
Linsley EG. 1962. The Cerambycidae of North America. Part III. Taxonomy and Classification of the Subfamily Cerambycinae, Tribes Opsimini Through Megaderini. University of California Publications in Entomology, Vol. 20. 188 pp.).

The species of Oeme have a characteristic facies derived from their delicate form, thin integument, and the constricted, subtubular basebase:
the part of any appendage or structure that is nearest the body
of their pronotumpronotum:
the upper and dorsal part of the prothorax
 (Linsley 1962Linsley 1962:
Linsley EG. 1962. The Cerambycidae of North America. Part III. Taxonomy and Classification of the Subfamily Cerambycinae, Tribes Opsimini Through Megaderini. University of California Publications in Entomology, Vol. 20. 188 pp.).

Diagnosis - larval

Head subtriangular, widest behind; 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
short, conicalconical:
wider at base than apex
, retractile; one ocellus; genal bristles dense; submentum deeply and suddenly sunken below anterior margin of hypostomal plates and fused with fleshy gula; prothorax depressed, transversetransverse:
broader than long
; no median suturesuture:
groove marking the line of fusion of two formerly distinct plates; the line of junction of elytra
on pronotumpronotum:
the upper and dorsal part of the prothorax
; postnotal fold absent; ventro-lateral sutures oblique, widely diverging anteriorly; sternellar fold not distinct at extremities; pleural discs conspicuous; dorsal ampullae with two lateral and two transversetransverse:
broader than long
impressions, wider in middle; legs short; form slender (Craighead 1923Craighead 1923:
Craighead FC. 1923. North American Cerambycid Larvae. A classification and the biology of North American cerambycid larvae. Bulletin of the Canada Department of Agriculture (n.s.) 27: 1–239, figs 1–8, pls 1–44.).

Similar genera

Eucrossus

Differential diagnosis

Oeme species have a noticeably thin integument and constricted posterior pronotumpronotum:
the upper and dorsal part of the prothorax
. Can be distinguished from Eucrossus by the pronotumpronotum:
the upper and dorsal part of the prothorax
rounded at the sides and unarmed elytral apicesapex:
end of any structure distad to the base
.

Distribution

Nearctic: continental United States

Recorded host plants

Pinus ponderosa, P. edulis, P. contorta, Taxodium distichum, Cupressus arizonica, Juniperus spp.

Remarks

Two species known, each with two subspecies.

DNA data

DNA sequence data is available for COI, CAD, and arginine kinase.

Synonyms

Sclerocerus LeConte, 1850

Taxonomy

Oeme Newman, 1840