Endemic and sub-endemic water beetles of Mongolia and their distribution ranges Author Enkhnasan, Davaadorj Institute of Biology, Mongolian Academy of Sciences, Peace Avenue 54 b, Ulaanbaatar 13330, Mongolia enkhnasand@mas.ac.mn Author Boldgiv, Bazartseren Ecology Group, Department of Biology, National University of Mongolia, Ikh Surguuliin Gudamj 1, & Academy of Natural Sciences of Drexel University, Philadelphia, PA 19103, USA text Journal of Species Research 2019 8 4 395 406 journal article 10.12651/JSR.2019.8.4.395 2713-8615 13161488 Agabus kaszabi Guéorguiev, 1972 Diagnosis . Length 10.0 mm. Body largely oval, slightly dilated in the middle, strongly convex, black, and slightly brilliant with a little bronze. Head brown-black, area behind head reddish, as well as two spots on vertex; pronotum black-brown and sides of pronotum, antennae and palps brownish-red. Elytra black with rufescent margin; a simple cross-linking of small, rounded, and even mesh on their intersections, but not dots in their interiors; dorsum punctuated entirely with dots larger than the suture; pronoto-elytral angle very low; underside brown, with prothorax and its apophysis, epipleurs and paws reddishbrown; entirely with micro-reticula of small and very fine mesh; metasternal wings finished in a fairly wide trian- gle; metacoxal lines whole rather divergent in front; last abdominal sternite entirely with micro-reticulous mesh, strongly on the posterior part; metatibias equal in length, their outer surface on the lower side entire with row of spurs; first segment of the metatarsi almost equal to the long metatibial spur ( Guéorguiev, 1972 ). Remarks . Agabus kaszabi Guéorguiev, 1972:38 [ Holotype $(Hungarian Natural History Museum, Budapest): Mongolia , Khentii , 19.viii.1965 , leg. Z. Kaszab].