Drusilla Leach, 1819

Eldredge, Taro, 2012, Review of the Nearctic species of Drusilla Leach (Coleoptera: Staphylinidae: Aleocharinae), Zootaxa 3300, pp. 45-54 : 46

Drusilla Leach, 1819

See Maruyama (2000) for a list of synonyms.

Diagnosis. Drusilla can be distinguished from all other Nearctic genera belonging to the tribe Lomechusini by the following combination of characters: 1) head with distinct neck ( Figs. 1–3 ); 2) head with occipital suture extremely short, terminating proximal to gena ( Fig. 3 ); 3) in lateral view, vertex sloping rapidly posteriorly to form a vertical, sometimes almost deflexed profile ( Fig. 3 ); 4) maxillary components, especially galea, elongate, forming a protruding complex visible past labrum in dorsal view ( Figs. 1 , 5 ); 5) labial palpomeres subequal in length ( Fig. 4 ); ultimate labial palpomere slightly curved inwards ( Fig. 4 ); 6) glossa relatively long, bifid with prominent separation ( Fig. 4 ); 7) dorsal abdominal surface sub-glabrous, with a few scattered setae (including macrosetae, Figs. 1–2 ).

Figures

FIGURES 1 – 3. Holotypes of Drusilla. Dorsal habitus: 1) D. nearctica; 2) D. ashei. 3) D. nearctica lateral view of head and thorax.

FIGURES 4 – 5. Mouthparts of Drusilla nearctica. 4) prementum, ventral; 5) right maxilla, ventral. Scale bars (0.1 mm): I = 5; II = 4.