Key to the males of the species of Andraegoidus Aurivillius (modified from Hüdepohl (1985))

1. Prothorax strongly swollen, mostly covered with sexual punctuation; antemedian tubercles slightly evident or absent...... 2

- Prothorax slightly swollen, sexual punctuation less extensive; antemedian tubercles generally evident. Brazil (widely distrib- uted), Bolivia, Paraguay, Argentina .................................................. A. rufipes (Fabricius, 1787)

2(1). Prothorax with postmedian elevations of the carina densely and coarsely punctuate................................. 3

- Prothorax with postmedian elevations of the carina not punctuate................................................ 7

3(2). Antennae exceeding elytral apices at segment X............................................................. 4

- Antennae exceeding elytral apices, maximum at segment VIII.................................................. 6

4(3). Pronotum and scutellum with evident and dense pilosity. Brazil (Minas Gerais).......... A. distinguendus Hüdepohl, 1985

- Pronotum with sparse hairs, scutellum glabrous.............................................................. 5

5(4). Elytra brownish yellow, semi-transparent, smooth. Bolivia (Figs 1–2).......................... A. translucidus sp. nov.

- Elytra black and with dense punctures. Paraguay, Argentina, Uruguay ..................... A. cruentatus (Dupont, 1838)

6(3). Prothorax without lateral tubercles evident; elytra black. Colombia ......................... A. laticollis Tippman, 1953

- Prothorax with postmedian tubercles evident; elytra black with red at the base to completely brown. Brazil (Paraíba, Bahía, Distrito Federal, Minas Gerais), Paraguay, Argentina, Uruguay (Figs 3–4)................. A. homoplatus (Dupont, 1838)

7(2). Pronotum with transverse carina flattened, prosternal process with a distinct tubercle directed anteriorly. Brazil (Mato Grosso, Mato Grosso do Sul Goiás, Ceará to Rio Grande do Sul), Bolivia, Paraguay, Argentina, Uruguay .. A. variegatus (Perty, 1832)

- Pronotum with transverse carina elevated; prosternal process without distinct tubercle. Venezuela, Brazil (Pará), Trinidad and Tobago (Figs 5–6).............................................................. A. lacordairei (Dupont, 1838)