Key to species of Irenimus

1 Scape clothed with setae only............................................................................2

- Scape clothed with appressed scales as well as setae..........................................................4

2 (1) Ventral margin of metatibial apex with a strong, conspicuous emargination. Elytra with elongate scales mostly decumbent. Abdominal ventrite 1 with few pappolepida, clothed primarily with appressed scales................... .. I. stichus n. sp.

- Ventral margin of metatibial apex entire or with an inconspicuous emargination. Elytra with elongate scales semi-erect to erect. Vestiture of abdominal ventrite 1 dominated by numerous pappolepida.......................................... 3

3 (2) Elongate scales of pronotum of equal length. Dorsal appressed scales with coarse ridges, resulting in a dull appearance.

Metaventrite with appressed scales laterally..................................................... I. aniptus n. sp. - Elongate scales of pronotum longer towards anterior margin. Dorsal appressed scales with fine ridges, resulting in a glossy appearance. Metaventrite with pappolepida laterally (Figure 38)..................................... I. crinitus n. sp. 4 (1) Larger species, body length longer than 4 mm .............................................................. 5

- Smaller species, body length shorter than 4 mm ................................................. I. minimus n. sp.

5 (4) Metatibiae with broad corbel (Figure 31). Ventral margin of metatibial apex emarginate (Figure 31). Pronotum with appressed scales flat, resulting in a smooth appearance................................................... I. parilis Pascoe

- Metatibiae with narrow corbel (Figure 33). Ventral margin of metatibial apex entire (Figure 33). Pronotum with appressed scales domed, resulting in a bumpy appearance............................................................ 6

6 (5) Lateral margins of pronotum evenly curved along length (Figure 39)............................... I. duplex (Broun)

- Lateral margins of pronotum strongly curved in anterior 2/3; subparallel in posterior 1/3 (Figure 40).... I. thoracicus n. sp.