Hemiosus Sharp

Short, Andrew Edward Z. & Torres, Phillip J., 2006, Review of the Hemiosus Sharp and Derallus Sharp of North America, Central America, and the Caribbean (Coleoptera: Hydrophilidae: Berosini), Zootaxa 1369, pp. 1-17 : 4

Key to the Hemiosus Sharp exclusive of South America

1. Pronotum entirely iridescent black ( Figs. 1–2 ). Elytra with distinctive black maculae of varying sizes ( Figs. 1–2 ) ............................................................. H. maculatus Sharp

- Pronotum with at least lateral margins testaceous ( Figs. 3–4 ). Elytra lacking large iridescent maculae............................................................................................................. 2

2 Pronotum with central iridescent black region reaching anterior margin medially ( Fig. 3 ). Aedeagus with median lobe very acutely pointed apically ( Fig. 5 ).......................... ....................................................................................................... H. selva Short, sp. n.

- Pronotum with central iridescent black region not reaching anterior margin ( Fig. 4 ). Aedeagus with median lobe bluntly rounded apically ..................... H. exilis (LeConte)

Figures

FIGURES 1 – 2. Dorsal and lateral habitus of Hemiosus maculatus Sharp (specimen from Costa Rica). Scale bar 2.1 mm.

FIGURES 3 – 5. Details of Hemiosus selva Short, sp. n. (3, 5) and H. exilis (LeConte) (4). 3 – 4: pronotal coloration, scale bar 0.18 mm; 5: aedeagus, scale bar 0.2 mm.