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)

meter of an eye, fine, and shallow; the ventral interocular groove is equal in length to the diameter of an eye, broader and much deeper than the dorsal groove; clypeus about half again as broad as long. slightly concave on the anterior margin; the rostrum surpasses the eyes by about one-half the postocular distance; only the first two antennal segments are present on the specimcn and they are in the ratio of 18 : 40. Pronotum: Length, 63 units; an encircling row of pits* parallel to the anterior margin and about three units from it; the posterior two-thirds of the pronotum with a shallow, median, longitunidal groove, faintly pitted except near the posterior end where the pits are more distinct; an irregular row of about twenty pits parallel to the median row on each side of it; an irregular row of about twenty pits near each lateral margin; five or six pits in an irregular row near each of the margins of the propleura, Metanotum : The hemelytra are large and long, extending nearly to the posterior margin of the fifth abdominal segment. C o x a e : The distance between the first and second coxae is to that between the second and third coxae as 37 : 68; all the acetabula are pitted; on the left side of the body the anterior acetabulum has one pit anterior to the cleft and two pits posterior to it; the middle acetabulum has two pits on each side of the cleft; the posterior acetabulum has two small pits; the pits on the right side of the body are similarly arranged except that the anterior acetabulum has two pits anterior to the cleft instead of one. F e m o r a : The anterior femora extend to the base of the antennae; the posterior femora slightly surpass the tip of the abdomen. A b d o m e n : Two large elevations on the ventral side of the posterior half of the sixth abdominal segment; each elevation is about midway between the median, longitudinal line and the lateral margin; these elevations are about one-half as long as the segment and are capped with a longitudinal brush of long stiff hairs, inclined outward and backward; the seventh segment is slightly compressed ventro-laterally to form a ventral keel, on each side of which is a large shallow depression; in dorsal view the sides of the seventh segment are nearly parallel; the tergites of the posterior two-thirds of the sixth segment and of the entire seventh segment present a fine. transversely-wrinkled appearance; the other tergites are polished: the tergite of the seventh segment is frosted; the terminal dorsal process of the male is prominent, about one-fourth as long as the segment, and curved slightly downwards.