7) as usual in subfamily, long and slender, apparent first segment (II) relatively short, stout, not reaching to level of antenniferous
tubercle, apparent second segment (III) very long and slender, narrowing posteriorly, apparent third segment (IV) shortest.
Head: wider than long, the anterior process short with small clypeus; gena reduced, not exceeding apex of clypeus; antenniferous
tubercles blunt; eyes large, semiglobose; postocular margins broadly rounded without tubercles or spine, not exceeding outer margins of eyes, converging on constricted neck; antenna long and stout, first and fourth segments subequal in length, second shortest, third longest, first incrassate, second, third and fourth clavate, fourth with pilose apex (Fig.
The subgenus Merocoris (Perty 1830) is characterized by having the antenniferous tubercles unarmed, the anterolateral borders of pronotum smooth or with single tubercle, and the scutellar disk conically raised.
Antenniferous tubercles unarmed; anterolateral borders of pronotum smooth or with only one tubercle; scutellar disk with high conical tubercle directed upward and eventually backward--Merocoris Perty 2
5/23); "genae" much shorter than clypeus and adherent at its apex; antenniferous
lobes short with apex acute; antennae 2.
Structure: body oblong, parallel-sided; head with vertex slightly convex; eyes simple, barely pedunculate; buccula low, short, scarcely extended backward as far as the antenniferous
tubercles, and apically rounded; rostrum reaching middle third of metasternum; pronotum with collar wide; frontal angles obtuse, rounded; anterolateral margins narrowly but distinctly carinate; humeral angles rounded, not exposed; fore femur with two subapical spines; middle and hind femora unarmed; macropterous, hemelytral membrane extending beyond the apex of last abdominal segment; costal margin slightly emarginate; apical margin straight; apical angle subacute; abdomen parallel, not dilated.
Both homonymical and synonymical usage abounds with anatomical terminology of insects, namely Heteroptera, such as "antennal tubercle, antennal sclerite, antennifer, antenniferous
tubercle, antennal socket, torus, torulus.
orinocoensis the pronotum, clavus, corium, prothorax, and metathorax are entirely yellow and the antenniferous
tubercle dark brown to black.
Both genera can be recognized by six characters: 1) hind femora unarmed; 2) antennal segments II and III cylindrical, not sulcate or dilated; 3) female genital plates short to medium-sized, never laminate; 4) mesopleura and metapleura without creamy-yellow hardened protuberance; 5) antenniferous
tubercle armed; 6) antennal segment IV pyriform.
It is recognized by having the hind femora unarmed; antennal segments II and III cylindrical and usually robust; antennal segment IV fusiform and slender; the antenniferous
tubercle armed; the mesopleura and metapleura without yellowish-white granules; the female genital plates short to medium sized, never laminate or elongate; and the distal lobe of each paramere short.
virgatus could be recognized by the following generic characters: juga surpassing tylus, but not contiguous anteriorly; lateral jugal margins distinctly sinuous, slightly reflexed; apex of head distinctly declivent when viewed laterally; antenniferous
tubercles clearly visible in dorsal view; antennal segment II and III cylindrical segments IV and V somewhat inflated; antennal segment II longer than any other segment; scutellum subtriangular, apex broadly rounded not reaching apices of coria; rostrum reaching metacoxae; each peritreme acuminate apically; basal abdominal spine small.
This is a key to facilitate the separation of Neotropical Harpactorini genera with delicate bodies, long legs, antenniferous
tubercle flat without spines, and mesepisternum without a tubercle.