Irenimus

Brown, Samuel D. J., 2017, A revision of the New Zealand weevil genus Irenimus Pascoe, 1876 (Coleoptera: Curculionidae: Entiminae), Zootaxa 4263 (1), pp. 1-42 : 8-9

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.

Figures

FIGURE 38. Metaventrite of Irenimus crinitus, left lateral view, showing pappolepida (white dart). Scale bar = 0.2 mm.

FIGURES 29 – 34. Left metatibia, anterior view. 29, Irenimus minimus; 30, Irenimus parilis; 31, Irenimus parilis, apical view; 32, Irenimus duplex; 33, Irenimus duplex, apical view; 34, Chalepistes compressus. Abbreviations: cl – corbel; sc—setal comb; ve—ventral emargination. Drawings not to scale.

FIGURES 39 – 40. Pronotum, dorsal view with head to top of image. 39, Irenimus duplex; 40, Irenimus thoracicus.