Agathidiini

Miller, Kelly B. & Wheeler, Quentin D., 2004, Two New Genera of Agathidiini from the Nearctic and Neotropical Regions (Coleoptera: Leiodidae), The Coleopterists Bulletin 58 (4), pp. 466-487 : 468-469

Key to the Genera of Agathidiini

1. Elytron with many (ca. 20) longitudinal impressed rows of punctures, integument between rows with transverse striations; mesosternum keel-like, interrupted by large excision visible in lateral view; apex of lateral lobe membranous, setose; eastern U.S. - - - - - - - - - - - - - - - - - - - - - - - - - - Cainosternum Notman

— Elytron with nine or fewer rows of punctures, frequently with only irregularly distributed punctures or none; mesosternum with or without carina, never in form of excised keel; apex of lateral lobe not membranous - - - - - - - - - - - - - - - - - - - - - 2

2(1). Antenna with 10 antennomeres ( Fig. 23 ) - - - - - - - - - - - - - - - - - - - - Decuria , new genus

— Antenna with 11 antennomeres - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3

3(2). Antennal club distinctly 5-segmented, antennomere VIII somewhat to considerably narrower than VII - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

— Antennal club 3- or 4-segmented, antennomeres VII and VIII similar in size or VIII distinctly larger than VII, (one northeastern Nearctic species, Ag. rusticum , with antennomere VII broader than VIII) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5

4(3). Anterior clypeal margin extending distinctly beyond anterolateral margins of frons (as in Fig. 1 ); supraocular carina absent (as in Figs. 24–32 ); punctation on elytra in linear, impressed series or not; metasternum without oblique femoral lines or carinae; Palaearctic, Oriental and Nearctic Anisotoma Panzer

— Anterior clypeal margin not extending to level of anterolateral margins of frons (as in Fig. 2 ); supraocular carina present (as in Figs. 1–2 ); elytral punctation never in linear series; metasternum with or without femoral lines; eastern Palaearctic and Oriental - - - - - - - - - - - - - - - - - - - - - - - Besuchetionella Angelini and Peck

5(3). Antennal club distinctly 4-segmented - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6

— Antennal club 3-segmented (one northeastern Nearctic species, Ag. rusticum , with antennomere VII broader than VIII) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7

6(5). Anterior clypeal margin distinctly extending beyond anterolateral margins of frons (as in Fig. 1 ); elytra with punctation arranged into longitudinal linear series or not; western Palaearctic - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Amphicyllis Erichson

— Anterior clypeal margin not extending to anterolateral margins of frons, distinctly excavate (as in Fig. 2 ); elytra with punctation not arranged into longitudinal linear series; Ethiopian and Oriental Afroagathidium Angelini and Peck

7(5). Supraocular carina absent (as in Figs. 24–32 ), or if present then clearly not extending posterad of the eye - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

— Supraocular carina distinctly present, extending posterad of eye (as in Figs. 1–2 ) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9

8(7). Female tarsi 4–4–4; Palaearctic and Oriental - - - - - - - - - - - - - - - - - - - Liodopria Reitter

— Female tarsi 5–4–4; Nearctic and Neotropical - - - - - - - - - - - - - - - - - Gelae , new genus

9(7). Elytra with prominent longitudinal striae with linear series of punctures (except S. agathidiiodes Angelini and Cooter ); clypeus extending beyond anterolateral margins of frons (as in Fig. 1 ); eastern Palaearctic, Oriental and Nearctic - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Stetholiodes Fall

— Elytra without prominent punctured longitudinal striae (except the Nearctic Ag. sexstriatum , Ag. bistriatum and Ag. estriatum ); clypeus extending beyond anterolateral margins of frons or not - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10

10(9). Anterior clypeal margin excavated, not extending beyond anterolateral margins of frons (as in Fig. 2 ) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11

— Anterior clypeal margin not excavated, extending to or beyond anterolateral margins of frons (as in Fig. 1 ) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

11(10). Aedeagus without lateral lobes; postocular tempora absent (as in Figs. 24–32 ); Oriental and Ethiopian - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Pseudoagathidium Angelini

— Aedeagus with lateral lobes; postocular tempora present or absent; Palaearctic, Oriental, Australian and Nearctic - - - - - - - - - - - - - - - - - - - - Agathidium Panzer (in part)

12(10). Palaearctic and/or Oriental - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13

— Nearctic. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Agathidium Panzer (in part)

13(12). Postocular tempora absent (as in Figs. 24–32 ) (except in C. tianmuensis Angelini and Cooter ); anterior clypeal margin extending well beyond anterolateral margins of frons (as in Fig. 1 ) - - - - - - - - - - - - - - - - - Cyrtoplastus Reitter

— Postocular tempora present (as in Figs. 1–2 ); clypeus extending slightly beyond anterolateral margins of frons - - - - - - - - - - - - - - - - - - - - Sphaeroliodes Portevin

Figures

Figs. 21–23. Decuria newtoni. 21–22) Median and lateral lobes of aedeagus; 21) ventral; 22) lateral; 23) right antenna, dorsal.

Figs. 1–2. Agathidium species, heads, dorsal. 1) A. athabascanum; 2) A. pulchrum. cl ¼ clypeus; pt ¼ postocular temporum; sc ¼ supraocular carina. Bars ¼ 0.5 mm.

Figs. 24–32. Gelae and Decuria species, heads, dorsal. 24) G. fish; 25) G. belae; 26) G. parile; 27) G. parvulum; 28) G. baen; 29) G. donut; 30) G. rol; 31) G. cognatum; 32) D. newtoni. Bars ¼ 0.25 mm.