Apalochrini, Mulsant & Rey, 1867

Tshernyshev, Sergei E., 2021, Dilatapalochrus gen. nov. - a new species and a new genus of soft-winged flower beetle of the tribe Apalochrini (Coleoptera: Malachiidae) from East Africa, Zootaxa 4966 (3), pp. 376-384 : 381-382

Key to genera of the tribe Apalochrini occuring in Africa (males only)

1. Antennae with 1st, 3rd or/and 4th antennomeres enlarged and modified.......................................... 2

- Antennae with simple, not enlarged and modified 1st, 3rd or/and 4th antennomeres, distal antennomeres forming flabellum thin or strongly dilated.................................................................................... 4

2. Special male characters are located in modified 1st, 3rd and 4th antennomeres, anterior legs simple.................... 3

- Special male characters in modified 1st and 3rd antennomeres and in stout or excavated anterior femora and tibiae.............................................................. Laius Guérin-Méneville, 1831 (= Nossibeus Evers, 1994 )

3. 2nd tarsomere in anterior legs simple, lacking a comb above............................. Heterolaius Champion, 1920

- 2nd tarsomere in anterior legs bears a comb above...................................... Syndesmolaius Evers, 1986

4. Male special structures are indistinct, antennae flabellate..................................................... 5

- Male special structures distinct and located on antennae, metathorax or legs, antennae flabellate or filiform............. 8

5. Antennae flabellate in male and serrate in female, pronotum simple or bisulcate in middle........................... 6

- Antennae filiform, 3–6 intermediate antennomeres widened, dorsal side of 5–10 antennomeres sulcate in middle, anterior tibiae simple.................................................................. Acroapalochrus Tshernyshev, 2020

6. Pronotum simple, lacking longitudinal grooves, anterior tibiae not emarginate distally in inner side.................... 7

- Pronotum bisulcate in middle, anterior tibiae slightly but distinctly emarginate distally in inner side................................................................................................... Airomalachius Pic, 1950

7. Anterior tibiae compressed and widened in apical half, intermediate tibiae impressed and flattened in outer side with weakly widened and curved apices, pronotum convex and narrowly depressed at base, elytra and pronotum uniformly dark with green or blue metallic luster and covered with long erect grey hairs...................... Mesapalochrus Tshernyshev, 2020

- Anterior tibiae slightly widened anteriorly and weakly impressed beneath, intermediate tibiae simple, not widened and not flattened, pronotum convex, not depressed at base, orange with longitudinal green-bronze stripe in a middle, elytra orangeyellow, each with two bronze metallic oval-triangular spots, surface covered with short erect fine white pubescence....................................................................................... Nudopectinus Evers, 1987

8. Anterior tibiae simple, not swollen or emarginate, anterior tarsi with a comb above 2nd tarsomere, intermediate tibiae slightly widened in apical half and sulcate in the middle of inner side........................ Protopectinus Tshernyshev, 2020

- Anterior tibiae widened, emarginate at apical part, anterior tarsi with a comb above 2nd tarsomere or lacking it.......... 9

9. 2nd tarsomere in anterior legs with a comb above.......................................................... 10

- 2nd tarsomere in anterior legs lacking a comb above, antennae serrate, anterior tibiae evenly emarginate, intermediate tibiae widened and narrowly emarginate, with pheromone glands.......... Mesopezus Jacobson, 1911 (= Epitinus Evers, 1987 )

10. Metathorax strongly swollen and possessing gladiate or rudimentary appendage with hairs in the middle, anterior tibiae slightly emarginate, intermediate tibiae swollen with apical margin simple and lacking setae........................................................................................ Dromanthomorphus Pic, 1921 (= Pectinus Evers, 1987 )

- Metathorax slightly swollen, lacking appendage or hairs..................................................... 11

11. Anterior tibiae strongly modified, deeply emarginate with lamellate processes, antennae flabellate or filiform........... 12

- Anterior tibiae simple, slightly emarginate at apical half beneath and apically thickened, antennae filiform............. 14

12. Antennae flabellate, distal antennomeres thin or strongly dilated.............................................. 13

- Antennae filiform, inner spurs of the anterior legs not lamellate or modified, slightly elongate and curved, 1st tarsomere in anterior legs subquadrate, simple, 2nd tarsomere similar length as the 1st tarsomere, with small and short transverse comb above, anterior tibiae dilated, strongly emarginate above and possessing wide rounded lamellate process, intermediate tibiae strongly widened and convex, emarginate within at apical half and possessing narrow parallel process at apical part of outer side........................................................................................................................................................................... Tibipectinus Tshernyshev, 2020

13. Distal antennomeres thin, inner spurs of the anterior legs lamellate, modified and curved, 1st tarsomere in anterior legs enlarged and compressed, leaf-shaped, dorsally with a row of golden hairs forming a tuft, 2nd tarsomere very short, almost completely covered by the vane-shape longitudinal comb, intermediate tibiae strongly widened and modified, emarginate within and possessing a row of long hairs inside the emargination.............................. Hapalochrops Bourgeois, 1908

- Distal antennomeres flat and strongly dilated, inner spurs of the anterior legs not lamellate or modified, small and simple, 1st tarsomere in anterior legs subtriangular, simple, 2nd tarsomere shorter than 1st tarsomere, subtriangular, with small and short transverse comb above, anterior tibiae dilated, strongly emarginate above and possessing small rounded lamellate process, intermediate tibiae strongly widened and convex, roundly emarginate within at apical half lacking process or appendage....................................................................... Dilatapolochrus Tshernyshev , gen. nov.

14. Intermediate tibiae strongly dilated and convex, with triangular perpendicular process in a middle of inner side and strongly emarginate beneath it............................................................ Hadrocnemus Kraatz, 1895

- Intermediate tibiae not widened and with a row of long erect thin hairs on inner side........... Setapalochrus Evers, 1988