Meropathina, Perkins, 1997

Perkins, Philip D., 2018, A new genus and new species of Meropathina from Lord Howe Island (Coleoptera: Hydraenidae), Zootaxa 4444 (4), pp. 409-420 : 416

Key to the Genera of Meropathina

1. Prothorax with deep hypomeral antenna pocket that is bordered laterally by wide wet hypomeron that bears prominent, stiff hypomeral antennal pocket setae ( Figs. 1, 2, 4 , 10 )........................................................... 2

- Antennal club held in relatively shallow, at least partially pubescent hypomeron that does not bear hypomeral antennal pocket setae ( Figs. 12 , 15, 17 )................................................................................. 3

2. Metaventrite transversely convex and entirely hydrofuge pubescent; Lord Howe Island ( Fig. 1).................................................................................................... Prototympanogaster new genus

- Metaventrite with large glabrous tabella; Australia, primarily eastern relict rainforests ( Figs. 2, 4 , 6, 7 )..................................................................................................... Tympanogaster Perkins

3. Occipital area of head with three parallel longitudinal carinae ( Fig. 14 ); gula with three longitudinal carinae (fig. 17); mentum elongate, rectangular, and notched at anterior margin for reception of labial palpi, which have tips overlapping ( Figs. 18, 19 ); metaventrite long, with midlongitudinal groove and very sparse non-hydrofuge setae; southeastern Australia............................................................................................... Tympallopatrum Perkins

- Occipital area of head without carinae ( Figs. 3, 5 ); gula without carinae ( Fig. 3, 5 , 12 ); mentum quadrate, labial palpi well separated ( Fig. 22 ); metaventrite short, entirely hydrofuge pubescent ( Figs. 8, 9 ); subantarctic islands and islands near New Zealand............................................................................... Meropathus Enderlein

Figures

FIGURES 2–5. Habitus Views of representatiVe species of Meropathina in the genera Tympanogaster and Meropathus.

FIGURES 10–13. Comparison of the hypomeron, antennal pocket, and posterior border of eye: (10–11) Tympanogaster (s. str.) modulatrix (with anomalous second pair of hypomeral antennal pocket setae), (12–13) Meropathus campbellensis. Structures: (e) periocular exocrine pores, (g) hypomeral antennal pocket setae (h) hydrofuge hypomeron, (i) hypomeral antennal pocket, (k) cupule article of antenna, (n) prosternum, (t) postocular hydrofuge, (V) cerVical sclerite.

FIGURES 14–19. Tympallopatrum longitudum: (14) dorsal habitus, (15–16) antenna and prothoracic hypomeron, (17) Venter of head, (18–19) Venter of head, mentum and labrum.

FIGURES 6–9. Comparison of metaVentrite of Tympanogaster (Hygrotympanogaster) macrognatha (6–7) and Meropathus campbellensis (8–9).

FIGURES 21–22. Comparison of maxilla and mentum: (21) Prototympanogaster lordhowensis, (22) Meropathus chuni.