Synolabus Jekel, 1860

Young, Julia Janicki Daniel K., 2021, Survey of the Attelabidae of Wisconsin (Coleoptera: Curculionoidea), Insecta Mundi 2021 (891), pp. 1-61 : 4

Genus Synolabus Jekel

Type species. Curculio nitens Scopoli, 1763, subsequent designation by Voss (1925).

Generic diagnosis. Synolabus can be recognized by the glabrous dorsal surface. They can be further distinguished from Homeolabus analis , which also has a glabrous dorsal surface, by the prothoracic femora that are armed with 1–2 blunt spine-like projections in males and unarmed or armed with a peg-like projection in females (not armed in H. analis ), by the submentum in males that is lacking a pair of projecting acuminate spines (present in H. analis ), and by the ventral rostral apex with a median conical prominence in lateral view (absent in H. analis ). Finally, the two North American species tend to be smaller in size than H. analis .

Key to Wisconsin species of adult Synolabus

1. Dorsal surface of elytra black with reddish markings extending from humeri to middle........................................................................... S. bipustulatus (Fabricius)

— Dorsal surface of elytra red............................................... S. nigripes (LeConte)