New species of the genus Berosus (Coleoptera: Hydrophilidae) from Central Asia and Transcaucasia Author Prokin, A. A. text Far Eastern Entomologist 2018 2018-10-05 368 1 10 http://dx.doi.org/10.25221/fee.368.1 journal article 10.25221/fee.368.1 2713-2196 7164568 1BBD5EED-E573-46FB-8B68-33D5352509BC Key to species of Berosus spinosus species group 1. Labrum dark brown to black ................................................................................ 2 – Labrum pale .......................................................................................................... 3 2. Pronotum without spots or dark patterns; abdominal ventrite 5 without toothlets at the posterior margin …....................................................................... B. fulvus – Pronotum with geminate, mostly clearly distinct pattern; abdominal ventrite 5 with small toothlets at posterior margin ................................................ B. jaechi 3. Total body length usually more than 5.5 mm ; length of aedeagus more than 2.1 mm ..................................................................................................................... 4 – Total body length less than 5.5 mm ; length of aedeagus less than 2.1 mm ; abdominal ventrite 5 without toothlets at posterior margin ( Figs. 8–11 ) ...............… 5