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)

margin of tlie thorax to the posterior margin of the sixth abdominal segment; the abdominal tergites are dark brown, polished except last one, but the connexiva and the ventral parts of the abdomen are light brown in color; the ventral parts of the postocular region of the head, the thorax, and the abdomen are Hghtly frosted. Structural Characteristics. Head : Length, 130 units; the ratio of the anteocular part of the head to the postocular part is given in the formula AO:PO: :85:35; the dorsal interocular groove is short, about equal in length to the cliameter of an eye, shallow, and narrow; the ventral interocular groove is about the same length as the dorsal groove but is much broader; the clypeus is truncate, about twice as broad as long; the rostrum surpasses the eyes by about one-third the postocular distance; the antennae are missing from the specimen. Pronotum : Length, 75 units; an encircling row of pits parallef to the anterior margin and about three units from it; a median longitudinal groove extends nearly the full length of the pronotum; scattered pits on the posterior lobe, the pits more numerous and deeper near the lateral margins; the prothorax and mesothorax have a swollen appearance in comparison with the other parts of the body. Metanotum: The hemelytra are long, extending to the posterior margin of the fourth 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 35:65; the anterior and middle acetabula are pitted; on the right side of the body the anterior acetabulum has three pits, one anterior to the cleft and two posterior to it; the middle acetabulum has two pits anterior to the cleft and three pits posterior to it; on the left side of the body the anterior acetabulum has one pit on each side of the cleft; the middle acetabulum has two pits on each side of the cleft; the posterior acetabulum on each side of the body is unpitted. F e m o r a : The anterior femora surpass the apex of the head by about one-eighth of their own length and the posterior femora extend beyond the tip of the abdomen by about the same distance. A b d o m e n : The two male processes are located on the ventral side of the seventh segment slightly anterior to the middle and somewhat nearer to the median longitudinal line than to the lateral margin; each process appears to be a small sharp spine;

:;: the sixth * Each spine is probably a tuft of very stiff hairs but the high power of the binocular microscope does not reveal the exact nature of the processes.