Drusilla

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

Key to Nearctic species of Drusilla

1 Body size larger (greater then 4.6 mm); apex of eighth tergite with a broadly emarginate serrate margin.......................................................................................... 1. D. canaliculata ( Fabricius, 1787)

1’ Body size smaller (less then 3.6 mm); apex of eighth tergite without a broadly emarginate serrate margin, apical middle produced with either side sinuate ( Fig. 20 )................................................................... 2

2 Paramere with velum completely obscuring apical lobe in an outer lateral perspective ( Fig. 18 ); distal apodeme of median lobe short, less than four times as long as wide ( Fig. 16 ); known from Arkansas................. 2. D. nearctica , new species

2’ Paramere with velum not completely obscuring apical lobe in an outer lateral perspective ( Fig. 14 ); distal apodeme of median lobe long, more than four times as long as wide ( Fig. 12 ); known from North Carolina........... 3. D. ashei , new species

Figures

FIGURES 20 – 25. Details of Drusilla nearctica (20 – 23) and D. ashei (24 – 25). 20) tergite VIII; 21) sternite VIII; 22) female genital segments (tergites IX and X), showing genital plate and spermathecal duct, dorsal; 23) spermatheca; 24) male genital segments (sternite IX and tergites IX and X), dorsal; 25) detail of sternite IX, ventral. Scale bars (0.1 mm): I = 20 – 22, 24 – 25.

FIGURES 12 – 19. Male genitalia of Drusilla ashei (12 – 15) and D. nearctica (16 – 19). 12, 16) aedeagus, lateral; 13, 17) aedeagus, parameral; 14, 18) paramere, outer lateral; 15, 19) apex of apical lobe of paramere, inner lateral. Scale bars (0.1 mm): I = 12 – 14, 16 – 18; II = 15, 19.