Key to males of the genus Alyculus

1. Pronotum with strong longitudinal keel reaching five sixths of the pronotal midline length (Fig. 4), cranium with apparent celllike structure, male genitalia with slender phallus (Fig. 10)..................................... A. tujuhensis sp. nov.

- Pronotum without apparent longitudinal keel (Figs 3, 5), cranium shiny or with fine irregular punctures, without apparent celllike structure......................................................................................... 2

2. Antennae slender, antennomere 3 at least 1.5 times longer than its width at apical part (Figs 1, 8)...................... 3

- Antennae robust, antennomere 3 apparently compressed, widest apically, 1.1 times longer than width at apex, subsequent antennomeres gradually slenderer, parallel-sided, less compressed to filiform (Fig. 6), male genitalia with slender phallus, paramerae widest at basal third (Fig. 11).................................................... A. barclayi sp. nov.

3. Body very small, less than 1.1 mm, testaceous, antennomere 3 is 1.5 times longer than width at apex (Fig. 1), male genitalia with slender phallus widened basally (Fig. 12).............................................. A. wittmeri Bocakova

- Body large, about 2.5 mm long, dark brown to black, antennae slender, antennomere 3 is 1.8 times longer than width at apex (Fig. 8), male genitalia with short phallus (Fig. 9).......................................... A. kurbatovi Kazantsev