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)

24 species of the genus Hydrometra for the Western Hemisphere and 12 for the Eastern Hemisphere. Tn this paper we record 30 species for the Western Hemisphere and 37 species and two varieties for the Eastern Hemisphere. There are some parallels of development in the two hemispheres, in both we find groups with a broad quadrate more of ]ess truncate clypens and groups with slender and conate clypeus. In the Western Hemisphere the first group ranges from Southern North America to the Amazon in South America, in the Eastern Hemisphere it is found in Africa south of the Sahara, in Madagascar, Australia and New Guinea. H. stagnorum (LINN.) and //. eremobia (KIRITSHENKO), somewhat reiated perhaps, being the only ones in the palaearctic region. In the Western Hemisphere the second group is found from Canada in North America to the Argentine in South America and the Eastern Hemisphere also has representatives from Sweden to Madagascar eastward including Australia and New Caledonia, and northward to China and Japan. The H. Greeni KIRK. group of closely related species are scattered as follows: H. Greeni KiRKALDY in Ceylon and South India. H. Maindroni sp. n. Mascate in the southeast of the Arabian peninsula. H. aegyptia sp. n. in Egypt and its variety Chabanaudi var. new in French Guinea (West Africa), and H. Isaka sp. n. in Madagascar, The H. lineata ESCHSCH. series has representatives in China, Japan, Philippines, Java, Sumatra and Australia. On the other hand there are certain well defined groups with characteristic facies that appear to have developed in restricted geographical ranges. There is, for example H. ambulator STAL and its three close relatives H. albolineolata REUTER, H. transvaalensis sp. n. and H. africana sp. n. which are found in Africa south of the Sahara and are unlike any other known species. Another group of characteristic species comprises H. Horvathi sp. n., H. Halei sp. n. and H. Illingmorthi. These species live in New Queensland of Northeastern Australia and in New Guinea which is quite near. In contrast to the above we have, here and there, species that are unique and are not represented in our collections by any close relatives. For example, there is H. Mulfordi HUNGERFORD from Bolivia, South America. It possesses a number of the characters set forth by Professor ESAKI for his Bacillometra. It has large eyes, a short thorax, the scutellar portion is visible and the sulcations of the sternum suggest Bacillometra. On the other hand the head is considerably more than twice as long as the prothorax (less than twice as long in Bacillometra). The second tarsal segment is not the shortest