Adephagous water beetles (Coleoptera: Gyrinidae, Haliplidae, Noteridae, Dytiscidae) of Yemen and Dhofar region (Oman) with description of a new Hyphydrus from Socotra Island Author Hájek, Jiří Department of Entomology, National Museum, Cirkusová 1740, CZ- 193 00 Praha 9 - Horní Počernice, Czech Republic; e-mail: jiri _ hajek @ nm. cz Author Reiter, Antonín South Moravian Museum in Znojmo, Přemyslovců 8, CZ- 669 45 Znojmo, Czech Republic; e-mail: reiter @ znojmuz. cz text Acta Entomologica Musei Nationalis Pragae 2014 2014-12-30 54 63 99 journal article 10.5281/zenodo.5314766 0374-1036 5314766 2111ED80-A550-4F9A-ADBF-8D663E692ADC Dineutus ( Protodineutus ) arabicus Régimbart, 1907 ( Figs 27–28 ) Published records. GAHAN (1985: 286): Yemen (as? Dineutus aereus ); RÉGIMBART (1907: 142) : Yemen (original description); data repeated by BALFOUR- BROWNE (1951: 195). Type material. SYNTYPES : 1 J, ‘Type [round label with red margin, printed] // Hadramaut . [yellow underlined] / Arabia. / 94-235 [printed] // Dineutus / arabicus Rég. / n.sp. [Régimbart’s handwriting]’ ( BMNH ); 1 ♀ , ‘ ♀ [printed] // Hadramaut .[yellow underlined] / Arabia. / 94-235 [printed] // No [printed] 461 [handwritten] / examined by / Prof. Thaxter for / Laboulbeniaceae . [printed] // Dineutus / arabicus / co-type Rég. [handwriten]’ ( BMNH ). Notes. A species known only from the type series from Hadramaut .With apical margin of elytra not serrate, it is more similar to Oriental D. indicus Aubé, 1838 rather than D. aereus . However D. arabicus differs from both mentioned species in absence of postero-lateral elytral sinuation ( Fig. 27 ), deeply impressed elytral reticulation and different shape of male aedeagus ( Fig. 28 ).