Dr. Murai Éva szerk.: Parasitologia Hungarica 16. (Budapest, 1983)

lected by the 1st Hungarian Parasitological Expedition), and from Luscinia megarhynchos (Turdidae) host fr om the environs of Budapest (Budajenő, 10 May, 1965, collected by Horvátovich). Unfortunately the latter specimens are very young (only the scolex could be studied), and probably represent B. triangula (Krabbe, 1869). RESULTS Biuterina cordifera sp. n. Hosts and locality: Lusciniola melanopogon Kiskunság National Park ( henceforth K. N

. P. ) Fülöpháza, Szivós-szék, 18 July, 1978, leg. MÉSZÁROS; Acrocephalus schoenobaenus and Acrocephalus scirpaceus, K.N.P. Fülöpháza, Szivós-szék, 26-28 July, 1977, leg. MÉSZÁROS. Localization: small intestine. Extensity: in Lusciniola melanopogon 2/1, in Acrocephalus schoenobaenus 13/2, in A. scirpaceus 7/1; on average 18% of examined warblers were infested by the new species. Intensity: 1-3 specimens. Description of holotype: Medium-sized paruterinid. Length of strobila 65 mm, maximum width (in post-mature proglottides) 0.88 mm. Proglottides craspedote and trapezoidal. Immature and mature proglottides wider than long (0.26 x 0. 17, 0. 36 x 0.30, 0.40x 0. 31, 0. 80 x 0.40, 0.88x 0. 50 mm). Shape of gravid segments narrower, becoming quadrate, later campanulate (0.82x 1.20 mm in fully gravid proglottides)

. Strobila made up of 2 50 proglottides (70 juvenile, 20 young-hermaphrodite, 60 pre-mature, 55 mature, 35 post-mature and 10 fully gravid proglottides which are separated from the strobila). Scolex globular, clearly separated from the strobila, 0. 385 mm in diameter and 0. 3 mm in length. Diameter of the large and well-developed suckers 0.15 mm. The 30 rostellar hooks arranged in two rows, diameter of hook crown 0. 13 mm, rostellum with strong musculature, 0.17 mm in diameter, 0.14 mm thick (Fig. 4). Shape of hooks characteristic, length of those in 1st row 56-61 }im, basis 31-35 urn, handle 26jum long, width measured at the guard 23~jim; length of hooks in 2nd row 33-40jum, basis 23-2 5 jam, handle 20 jam and guard 13_um (Figs 5, 14). Ending of handle and guard markedly thickened. Genital pores irregularly alternating between medial position on right side and on left side, 2t>-28^um deep. Ventral longitudinal excretory canals large (40iim in diameter), with transverse anastomosis. Cirrus sac elongate, 95-107 x 25-35jum. Extravascular. Cirrus 40jim long.Vesiculae seminalis externa and interna absent. Vas deferens describing a few bands in cirrus. sac, than passing the line of ventral longitudinal excretory canals, a larger number of coils. Vagina thin-walled, opening into genital atrium behind cirrus sac. Spreading towards medial line of proglottides and forming a small vertically placed seminal receptacle between the lobes of uterus in last third of proglottides. Ovary bilobed, situated centrally in second third of proglottides. Vitelline gland behind ovary, aporally situated above anastomosis of excretory canal (Fig. 1). Testes lateral and postovarian, 6 in number (perhaps more, could not be determined exactly). Paruterine organ in first quarter of proglottides, filling the region between ventral excretory canals, with cork-shaped cellular structure. Uterus first a diagonally situated sac behind paruterine organ (in pre-mature proglottides). Mature proglottides curved in a horse-shoe shape, surrounded by paruterine tissue laterally and dorsally. The intensively stained paruterine cells, in a 30-40 jum thick layer, also appeared on the inner sides of the two branches of the uterus (Figs 2, 7-11). Lumen of uterus covered by thick layer of (glandular?) cells of intensive staining. The bilobed uterus heart-shaped (hence the specific name) and surrounded by paruterine tissue in mature and post-mature proglottides. Round formations, equal in number to the subsequent egg capsules, may be seen in lumen of uterus of pre-mature proglottides. Wall of uterus abruptly becoming thin in post-mature proglottides, eggs (already mature here)