Key to the genera of Anisoscelini for Argentina

1a. Body with markings dorsally and ventrally, head usually with two or three thin longitudinal lines (Fig. 1); antennae generally cylindrical with flattened and foliaceous expansions (Figs. 2–3); distal pronotal segments usually expanded (Fig. 4); posterior legs with foliaceous expansions outer face of cylindrical tibia only, sometimes can cover entire tibia (Figs. 5–6); femora not armed with spines................................................................................... 2a

1b. Body without markings dorsally and ventrally, head without longitudinal lines (Fig. 4); antennae generally cylindrical without foliaceous expansions (Fig. 8); pronotal angles of pronotum not expanded (Fig. 9); femora armed with spines (Fig. 7)..... 4a

2a. Body color variable, hind tibia dilated on outer side only, posterior margin and lateral margin of pygophore not flared..... 3a

2b. Body color brown varying from pale to dark, hind tibia dilated on both sides, posterior margin and lateral margin of pygophore flared........................................................... Leptoglossus Guérin-Méneville (Figs. 16–22)

3a. Tibial external dilation approximately two times wider than the inner expansion extending over most of the tibia and gradually decreasing towards the apex, in some cases very thin, in this case the internal expansion of the pronotum is absent, without pronotal expansions on posterior margin, all antennal segments cylindrical................... Anisoscelis Latreille (Fig. 11)

3b. Tibial external dilatation narrow, usually extending almost the entire length of the tibia or limited to 2/3 basal segment of the tibia; posterior margin of pronotum with conspicuous expansions, antennal segments II and III expanded.................................................................................. Holhymenia Le Peletier & Serville (Fig. 12)

4a. Head declivent from the antenniferous tubercules, obliquely truncated apex...................... Ugnius Stål (Fig. 13)

4b. Head prominent and not declivent from the anteniferous tubercules............................................. 5a

5a. Femora ventral surface never dilated or with foliate tibiae............................ Dalmatomammurius Brailovsky

5b. Femora ventrally dilated or with foliate tibias............................................................. 6a

6a. Pronotum with necklace, posterior angle of the scutellum spined, femora armed with spines arranged in two rows........................................................................................ Coribergia Casini (Fig. 10)

6b. Pronotum lacking a neck, wider than long; scutellum not spined, femora unarmed................................ 7a

7a. Anterolateral margins smooth; femora ventrally armed with denticles, dorsally smooth; hind femora gradually incrassate; metathoracic peritreme not bilobate; clavus and corium rather dull or scattered with metallic iridescence absent; posterior lobe of pronotal disk with low longitudinal carinae; abdominal sterna III–VI lateral to midline with rectangular yellowish to reddish orange maculae....................................................................... Phthia Stål (Fig. 14)

7b. Anterolateral borders dentate, teeth relatively stout and acute; femora ventrally armored with two subapical spines and one row of obtuse spines, dorsally almost smooth; hind femora gradually incrassate; metathoracic peritreme bilobate; clavus and corium rather dull or scattered with metallic iridescence; posterior lobe of pronotal disk not low longitudinal carinae.............................................................................. Phthiacnemia Brailovsky (Fig. 15)