Cossoninae, Schoenherr, 1825

Friedman, Ariel-Leib-Leonid, 2023, A review of the saproxylic weevil subfamily Cossoninae (Coleoptera: Curculionidae) in Israel, Israel Journal of Entomology (Oxford, England) 52 (6), pp. 75-96 : 79-81

Key to genera and species of Cossoninae in Israel

1 Humeral calli absent, elytral base rounded; flightless) Figs 3, 6 (.....................2

– Humeral calli present, elytral base angular; able to fly) Figs 1, 2, 4, 8, 12 (.....3

2 Antennal funicle 5-segmented; rostrum bent at antennal insertion in lateral view; eye small, with <5 ommatidia; body slender, elytra glabrous, appearing completely bare, rarely at apical third with small erect setae, much shorter than width of elytral interstriae; body length 1.9–2.7 mm ( Figs 3, 14)................................ ................................................................................. Amaurorhinus bewickianus

– Antennal funicle 7-segmented; rostrum nearly straight; eye large, flat, with>20 ommatidia; body more rounded, elytra coarsely sculptured, covered entirely by straight subrecumbent setae, distinctly longer than width of elytral interstriae; body length 2.7–3.8 mm ( Figs 6, 7, 16, 17)............................. Pselactus spadix

3 Antennal funicle 5-segmented; body and elytra coarsely sculptured, pronotal punctures of irregular form, more or less contiguous, interstriae narrow, sharp, smaller than diameter of a puncture, medially sharply upraised to form sharp rides; body length 2.3–3.2 mm ( Figs 1, 2, 13).............. Choerorhinus squalidus

– Antennal funicle 7-segmented; body and elytra finely sculptured, glabrous or slightly shagreened, other characters variable ..................................................4

4 Rostrum at least twice as long as head; body slightly flattened dorso-ventrally; protibia medially with blunt projection ............................................................5

– Rostrum at most 1.1× as long as head or shorter; body cylindrical; protibia medially without projection ..............................................................................7

5 Antenna inserted at middle or slightly before middle of rostrum in both sexes; body length 1.9–3.2 mm ( Figs 4, 5, 15, 30)......................... Caulophilus oryzae

– Antenna inserted behind middle of rostrum)male rostrum wide, coarsely punctate(or at base or close to base (female rostrum slender, glabrous); body length 3.5–7.5 mm)Figs 21-29(...................................................................................6

Figs 13–20. Cossoninae of Israel, lateral view:(13) Choerorhinus squalidus , habitus; (14) Amaurorhinus bewickianus , habitus; (15) Caulophilus oryzae , habitus; (16) Pselactus spadix , female, habitus; (17) Pselactus spadix , male, head and pronotum; (18) Brachytemnus porcatus , habitus; (19) Melicius gracilis , habitus; (20) Rhyncolus sculpturatus , habitus.

6 Body unicolorous, dark brown to reddish brown; pronotal disc distinctly microreticulate between punctures; interpunctural spaces on elytral declivity with well separated round punctures; body length 4.0–7.5 mm (Figs 21–23, 26, 27)........ .................................................................................................... Mesites cunipes

– Body usually bicolorous: pronotum darker, nearly black, elytra and appendages brown to testaceous; pronotal disc between punctures smooth; interpunctural spaces on elytral declivity coarsely punctated by contiguous irregular, often transverse punctures; body length 3.5–7.0 mm (Figs 24, 25, 28, 29)................. ........................................................................................... Mesites pallidipennis

7 Rostrum slightly longer than head; eye flat; pronotum with contiguous punctures; male profemur incrassate; body length 2.2–3.5 mm ( Figs 10, 19) ..................... .................................................................................................. Melicius gracilis

– Rostrum as long as, or shorter than head; eye flat or strongly protruding; pronotum with distinct round or oblong punctures............................................................8

8 Eye flat; rostrum longer than wide in dorsal view, not tapering apically; pronotal punctures round; interstriae slightly convex; body length 2.9–3.8 mm ( Figs 8, 9, 18) ............................................................................. Brachytemnus porcatus

– Eye strongly protruding; rostrum as long as wide, slightly tapering apically; pronotal punctures oblong; interstriae medialy upraised into longitudinal ridges; body length 3.5–4.5 mm ( Figs 11, 12, 20)..................... Rhyncolus sculpturatus