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)

Hydrometra bifurcata sp. n. (Platc 1). Size and Color: Length, 11.8 mm (male holotype), 13.9 mm (female allotype): the general color of the body is a very dark brown; the pronotum of the male holotype with a narrrow, median, longitudinal, lightcolored stripe, which is more distinctly defined on the posterior lobc; the median stripe is bordered successively on each side by a purplishbrown band, a broader band of brownish yellow, and on the extreme lateral margins by a band of purplish brown; a frosted stripe extends along the lateral margins of the thorax; the frosted stripe along the lateral margins of the abdomen is very faintly defined except near the margin of each segment where there is a large patch of frosting; ventral parts of the entire body with frosted appearance: ihe female allotype is similarly colored with the exception that the median stripes on the pronotum are narrow and much lighter in color and that the stripe along the lateral margin of the abdomen is clearly defined. Structural Characteristics. Head: Length, 112 units (holotype), 126 units (allotype); the ratio of the anteocular part of the head to the postocular part is given by the formula AO:PO: :72:30 (holotype), 82:33 (allotype); on both the male and female the dorsal interocular groove is short about as long as the diameter of an eye, shallow and narrow; the ventral interocular groove on both the male and female is the samc lenght as the dorsal groove but is somewhat deeper and broader: the clypeus is deeply and broadly incised, thus appearing bifurcated: the rostrum of the male and female surpasses the eyes by about one-half the postocular distance; beginning with the basal one the lengths of the segments of the antennae are in the following ratio: 20:44: : 129:62 (male), 23:49: : 133:57 (female). Pronotum: Length, 52 units (holotype), 67 units (allotype); an encircling row of pits parallel to the anterior margin and about three units from it; the posterior lobe has a median longitudinal row of pits and other pits arrangend in rows; a row of three or four faint pits near the margin of each of the propleura of the male; on the female the pits on the propleura are more numerous. Metanotum:* Length, 45 units (holotype); the hemelytra of Metanotum used throughout descriptions — of course the hemelytra arise from preceding segment.