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)

although it is longer than in typical Rydrometra (see plate XI). The body is only a little more than half as broad relatively as in Bacillometra ventralis ESAKI. Bacillometra oentralis ESAKI was described from a winged male. J he femora are incrassate at base and the type measures 6.6 mm long by 1 mm in breadth. Hydrometra Mulfordi HUNGERFORD was described from six apterous females. They are 12.5 mm long and 1.1 mm in breadth across +he abdomen which ist the widest place in these females. The femora are not incrassate. Until both sexes are available either in one or the other of the above species it is impossible to say they are congeneric. Hydrometra Mulfordi HUNGERFORD is at least intermediate between Hydrometra and BaciUometra. There is H. madagascarensis sp. n. The nearest relative of this second species appears to be H. longicapitis BUENO from Sumatra. Another interesting illustration is that of the strangely formecl H. Sztolcmani JACZEWSKI described from Parana, Brazil, and possessing remarkable lateral outgrowths ol the first genital segment in the male. No other species known from the Western 1 lemisphere has even a suggestion of such modification of the first genital of the male. Over in South Africa there is H. Turneri sp. n. with much smaller process similarly placecl. This species, however, is not a close reiative being mnch near akin to H. stagnorum (LINN.). Divisions of the Family Hijdrometriclae. In 1927 Professor TEISO ESAKI (5) proposed the division of the family into two subfamilies which he characterized as follows: 1. Hydrometrinae. „Antennae four-jointed, third segment longest, first shortest. body slender, more than six times as long as broad; head setae in ihree pairs set in pits, two pairs on the anterior swollen part, one pair near the base; rostrum not passing the anterior margin of prothorax, omphalium absent, tarsal claws apical." In this subfamily he placed two genera, Hydrometra LAMARCK 1801 and Bacillometra FSAKI 1927. Hydrometra which is universally distributed now includes 67 species and 2 varieties and Bacillometra with a single known species from South America. (Unless H. Mulfordi HUNGERFORD should go here in which case the generic .diagnosis must be modified).