S. Mahunka szerk.: Folia Entomologica Hungarica 48. (Budapest, 1987)

Phallotheca very long. Endotheca well-developed. Aedeagus bilobed with a broader dorsal lobe. Parameres long. Their apices with short preapical spines and with one long apical spine. Inferior appendages short. Terminal segment forms a ventral lobe. Remarks: Similar to R. hangnia

, still I face difficulties to relate this species to-any group. The arrangement of the phallic apparatus has resemblance to R. hangnia

, but much longer. The connection of the tenth segment to the phallic apparatus is also similar, but the ventral arm of the seg ment is more developed opposite to the strongly developed dorsal lobed of R. hangnia

. The species was singled along a deep spring brook, therefore, I named accordingly (spring = banra in Vietnamese Fig. 6. Rhyacophila banra sp.n. A: male genitalia lateral; B: dorsal Type material: Holotype o

71 Tamdao, Vietnam, along spring brook about 1400 m a.s.l. 13.10. 1986, singled, leg. OLÁH. Deposited in the Zoological Department, Hungarian Natural History Museum, Budapest. Right pair of wing mounted as dry microscopic preparation. Caustic potash-treated abdomen and the remaining part of the body are stored in a single airtight self-standing glass vial filled with 70% ethanol. 4 a* paratypes. Tamdao, Vietnam, along a spring brook about 1400 m a.s.l. 13.10.1986, singled, leg. OLÁH. Male (in alcohol). General colour brown. Pleur on on thorax, legs, abdominal sternites pale. Antenna! annulation pronounced. Wing membrane brown with darker pubescens. Costal and subcostal area on fore wing enlarged, light and more densely covered with blackish hairs. Hyaline area on cross vein r-m and on the costal ending of cu

2 very small, on cross-vein m-cu large. Length and largest width of fore wing 4.6-1.8, those of hind wing 4.0-1.6 mm. Male genitalia. Abdomen with a slender and longer process on sixth sternite and stouter shorter process on seventh sternite. Ninth segment ring-like with a well-developed lateroventral narrowing, and without any dorsal lobe. Tenth segment very curiously developed. Structural units difficult to homologize . Horisontally produced two large lobes dominate with fused basal part. Both lobes form a dorsal and a lateral plate fused rectangularly without any visible suture. Inside, along the upper margin of the lateral plate runs a row of short stout spines. The fused basal part forms ventrally a pair of sclerotized bands collecting the long segment to the dorsal process of the phallic apparatus. Attached to the lower part of this band there is a tongue-like plate with a sclerotized and A Rhyacophila hangnia sp. n. (Fig. 7)