| 1 | Antennomeres 9-11 elongated, 8 clearly shorter and narrower than 9 |
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| – | Antennomeres 9-11 not enlarged, 8 about as long and wide as 9 |
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| 2 | Antennomeres 9-11 serrate or pectinate in males, females larger than 15 mm |
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| – | Antennomeres 9-11 neither serrate nor pectinate, females smaller than 15 mm |
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| 3 | Hypomera with basally closed lateral antennal grooves forming deep basal pockets for reception of antennae (Fig. |
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| – | Hypomera either simple (Fig. |
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| 4 | Clypeus very wide and short, distance between the antennal insertion points 6-10 times the distance from the lower edge of the antennal insertion point to the edge |
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| – | Clypeus much narrower, the width at most 4.5 times the height |
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| 5 | Hypomera with pit-like hairy excretory organs (Fig. |
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| – | Hypomera without such structures |
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| 6 | Head simple, frons and clypeus without keels |
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| – | Frons and/or clypeus with sharp keels |
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| 7 | Lateral pronotal ridge minutely serrate (Fig. |
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| – | Lateral pronotal ridge smooth |
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| 8 | Elytral suture forming a beak before the apex in lateral view (Fig. |
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| – | Elytral apex evenly curved to end in lateral view |
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| 9 | Combined length of antennomeres 2 and 3 less than the length of 4 |
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| – | Combined length of antennomeres 2 and 3 always distinctly greater than the length of 4 |
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| 10 | Metacoxal plates approximately parallel-sided (Fig. |
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| – | Metacoxal plates distinctly wider close to the insertion point of the trochanter than on the sides (Fig. |
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| 11 | Antennal grooves parallel-sided, always well defined, body parallel-sided, antennae feebly serrate, often elongated |
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| – | Antennal grooves either entirely absent or widening caudad, poorly delimited |
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| 12 | Antennomeres dentate, body uniformly yellow |
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| – | Antennomeres 4-10 serrate or pectinate, dorsum dark or bicoloured |
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| 13 | Pronotum unusually large compared to the rest of the body, body front-heavy in appearance, pronotum black, elytra sometimes with pale spots |
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| – | Dorsum black, pronotum and elytral longitudinal stripes yellow |
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| 14 | Width of the frons between antennal sockets less than half the distance between the eyes, usually distinctly less, body usually black or dark brown, male protarsomere 1 with an apical sex comb |
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| – | Width of the frons between antennal sockets at least half the distance between the eyes, usually distinctly more, body evenly yellowish brown, male protarsomere 1 without any spine comb |
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| 15 | Hypomera without medially defined antennal grooves (Fig. |
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| – | Hypomera with medially sharply defined basally open lateral antennal grooves (Fig. |
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| 16 | Mandibles slender |
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| – | Mandibles stout with a secondary basal tooth |
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| 17 | Meso- and metatibiae without spine combs on lateral surfaces, male protarsomere 1 simple |
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| – | Meso- and metatibiae with spine combs, male protarsomere 1 with a basal sex comb (Fig. |
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| 18 | Antennomeres 3-10 deeply serrate or flabellate |
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| – | Antennomeres 3-10 tubular, neither serrate nor flabellate |
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| 19 | Frons usually conspicuously flattened, antennomeres 6-10 slightly enlarged and flattened, 6 always longer and usually wider than 5, 3-10 not serrate |
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| – | Frons convex, antennomere 5 usually similar in size to 6, antennomeres 3-10 dentate, serrate or tubular, protibiae with simple apexes |
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| 20 | Dorsum shiny or very shiny, at most densely punctate, brownish |
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| – | Dorsum extremely dull, very densely and strongly rugose, black |
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| 21 | Elytral epipleura grooved, smooth and shiny basally |
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| – | Elytral epipleura even, not grooved in front |
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| 22 | Abdominal tip excavated, bifid |
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| – | Abdominal tip pointed or rounded |
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| 23 | Antennal grooves large in volume, wider than rest of hypomera |
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| – | Antennal grooves much narrower than rest of hypomera (Fig. |
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| 24 | Elytra with sharply marked, punctate striae (Fig. |
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| – | Elytral striae faint, never punctate, elytra rarely parallel-sided in shape |
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| 25 | Claws with basal teeth |
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| – | Claws simple |
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The genera reported either earlier or in this study are shown in bold. The key also includes genera that are still undiscovered in Peru, but likely to be found there because they are known from the surrounding region (shown in italics only).
Hypomera with basally closed lateral antennal grooves forming deep basal pockets for reception of antennae.
Hypomeron without an antennal groove,
Hypomeron with a notosternal antennal groove,
Hypomeron with a lateral antennal groove,
Protarsus with a basal sex comb on tarsomere 1,
Hypomeron with a sensory pit,
Front edge of pronotum with a serrate ridge,
Protarsus with an apical sex comb on tarsomere 1,
Rounded tip of the elytra,
Uniformly wide metacoxal plate,
Laterally narrowing metacoxal plate,
Punctate elytral striae,