Fornax convexicollis, 2020

Otto, Robert L., 2020, A review of the Nearctic species of Fornax Laporte (Coleoptera: Eucnemidae: Macraulacinae: Macraulacini) with descriptions of six new species, Insecta Mundi 2020 (818), pp. 1-26 : 3-4

Key to the species of Fornax in the Nearctic region

1. Pronotum wider than long (Fig. 1); tarsal claws basally toothed................................ 2

— Pronotum as long as wide (Fig. 2); tarsal claws basally swollen, simple.............. F. knulli Muona

2(1). Base of frontoclypeal region with narrowly incomplete, delicate, horizontal interantennal carina.... 3

— Base of frontoclypeal region without indications of horizontal interantennal carina............... 4

3(2). Pronotal disc with delicate, short, shallow median groove............ F. convexicollis Otto , sp. nov.

— Pronotal disc without delicate, short, shallow median groove......... F. parallelicollis Otto , sp. nov.

4(2). Pronotum dull........................................................................... 5

— Pronotum shiny.................................................. F. lucidicollis Otto , sp. nov.

5(4). Dorsum dark reddish brown.............................................................. 6

— Dorsum brownish black.................................................................. 8

6(5). Pronotum parallel-sided to weakly arcuate in basal half in males; parallel-sided in basal 2/3 to 3/ 4 in females............................................................................. 7

— Pronotum strongly arcuate in males; cranially narrowed in females..... F. melsheimeri Otto , sp. nov.

7(6). Pronotum parallel-sided in basal half in males; antennae elongate, reaching half of body length in females.................................................... F. appalachiensis Otto , sp. nov.

— Pronotum laterally weakly arcuate in males; antennae slightly stouter, reaching nearly half of body length in females..................................................... F. floridana Otto , sp. nov.

Figures 1–4. Fornax species. 1 ) Fornax appalachiensis Otto , sp. nov., male, pronotum. 2) Fornax knulli Muona , male, pronotum. 3) Fornax dixiensis Otto , female, last visible ventrite. 4) Fornax bicolor (Melsheimer) , female, last visible ventrite. (Scale: 1–4 = 1.0 mm.)

8(5). Last abdominal ventrite produced (Fig. 3) in both sexes.......................... F. dixiensis Otto

— Last abdominal ventrite either obtuse or very weakly produced (Fig. 4) in both sexes................................................................................ F. bicolor (Melsheimer)