A review of the Oriental Copelatus latipes complex, with the description of two new species (Coleoptera: Dytiscidae: Copelatinae).

The Copelatus latipes species complex is introduced for Oriental species of Copelatus Erichson, 1832 belonging to the C. irinus group and characterised by the presence of processes on the ventral side of the median lobe of the aedeagus, forming a "beak-shaped" structure. The complex comprises six species, including two newly described taxa: Copelatus bezdeki Sheth, Ghate & Hájek, 2018 (India), C.

Copelatus Erichson, 1832 from Maharashtra, India, with description of three new species and notes on other taxa of the genus (Coleoptera: Dytiscidae: Copelatinae).

The Copelatus species occurring in Maharashtra State, India, are reviewed. Altogether, nine species are recorded, three of which are described as new: Copelatus deccanensis sp. nov.

Illustrated redescription of Haliplus (Liaphlus) arrowi Guignot, 1936 (Coleoptera: Haliplidae) from the Western Ghats, India, and notes on the closely related H. angustifrons Régimbart, 1892.

In an ongoing survey of aquatic beetles, the crawling water beetles Haliplus (Liaphlus) arrowi Guignot, 1936 and Haliplus (Liaphlus) angustifrons Régimbart, 1892 were found only from four (three localities for H. arrowi and one locality for H. angustifrons) out of 85 localities sampled in and around the Western Ghats of Maharashtra.