Key to species of Hemicolpus

1. Pronotal midline carina strongly humped or raised, almost as high as long; Brazil ............ Hemicolpus heteromorphus

- Pronotal midline carina not humped, or only slightly raised.................................................... 2

2. Mesoventrite strongly excavated (Figs. 5a, b, 34a, b); second abdominal ventrite bearing a pair of tubercles (Figs. 19, 20, 46, 47)................................................................................................ 3

- Mesoventrite flat (not-excavated); second abdominal ventrite without tubercles.................................... 4

3. Inner glabrous triangular patch extending at maximum over a third of the area of the mesanepisternum (Fig. 35); metafemur not carinate (Fig. 36a); inner flange of the tibial apex almost as wide as long; premucro oriented 45° (Fig. 36b); penis with preapical constriction (Fig. 50); gonocoxite without unsclerotized stripe (Fig. 53); Bolivia, Brazil, Paraguay ...................................................................................................... Hemicolpus abdominalis

- Inner glabrous triangular patch extending over almost half of the area of the mesanepisternum (Fig. 6); metafemur with carina at inner face (Fig.7a); inner flange of the tibial apex longer than wide; premucro oriented 90° (Fig. 7b); penis without preapical constriction (Fig. 23); gonocoxite with unsclerotized transverse stripe (Fig. 26); Brazil ......... Hemicolpus maragatensis

4. Body glabrous; elytral interstriae not raised; Brazil ........................................... Hemicolpus cubicus

- Body covered with scales; elytral interstriae raised.......................................................... 5

5. Body scales longer and narrower; anterior margin of metaventrite carinate and strongly excavated beneath.............................................................................................. Hemicolpus costaricensis

- Body scales shorter and broader; anterior margin of metaventrite not excavated.................................... 6

6. Anterior margin of metaventrite strongly declivous with weak depression; pronotum with distinct callosities; elytral interstriae 3 and 9 raised for most of their length; interstriae 5 raised at base; El Salvador and Mexico ........... Hemicolpus prenai

- Anterior margin of metaventrite strongly declivous without depression; pronotum with faint callosities; elytral interstriae 3 and 9 raised at the erect white setae and slightly beyond; interstriae 5 raised for most of its length; El Salvador and Mexico ........................................................................................ Hemicolpus randiae