Moesz Gusztáv - Soós Lajos (szerk.): A Magyar Természettudományi Múzeum évkönyve 28. (Budapest 1934)

Hungerford, H. B. ; Evans, N. E.: The Hydrometridae of the Hungarian National Museum and other studies in the family. (Hemiptera)

16. Clypeus truneate to slightly rounded on anterior margin (17). Clypeus eonate (18). 17. Color dark. Two protuberanees on the sixth ventral and also on the first genital of male H. stagnorum (LINN). Color light (flavo-ferrugineus) H. eremobia" KIRITSH. 18. Eyes and head normal in diameter (19). Eyes small and head very slender and much longer than the thorax. The postocular length plaintly greater than the distance between the anterior and middle acetabula measured on their lower margin from cleft to cleft (36). 19. First genital segment of male with lateral protuberances slightly overlapping the rear margin of the sixth segment H. Turneri sp. n. First genital not as above (20). 20. Two spine-like processes on venter of sixth abdominal segment of male (21). No spine-Iikc processes on venter of sixth abdominal segment of male (24). 21. Two spine-Iike processes near anterior margin of sixth ventral of male (22). Two spine-Iike processes slightly anterior to the middle of sixth ventral of male or absent (23). 22. ILind femora not attaining tip of abdomen. Head not conspicuously longer than thorax. Male processes small H. gracilenta HORVATH. Hind femora surpassing tip of abdomen and head conspicuously longer than thorax. Male processes stout and curved aculeata MONTR. 2". Two spine-like processes present //. procera HORVATH No spine-like processes on venter of sixth abdominal segment of male (24). 24. Two brush tipped elevations near the middle of the sixth ventral of male H. annamana sp. n. No stout mammilose elevations on sixth ventral of male (25). 25. Venter of sixth abdominal segment of male swollen H. Butleri sp. n. Venter of sixth abdominal segment of male not swollen (26). * We have not seen niales of this species bnt thc females look like a pale variety of H. stagnorum (LINN.).