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

B Fig. 4. Rhyacophila janosi sp. n. A: male genitalia, lateral; B: dorsal; C: male wings pendage of R. janosi is much shorter and the terminal segment less excised. Very important difference is the visible suture between the fused dorsoapical lobe and the preanal appendages. I dedicate this interesting species of this unique group to celebrate my son's ninth birthday. Type material: Holotype a*. Tamdao, Vietnam, ?0.

01.1986, singled, leg. OLÁH along the main stream. Deposited in the Zoological Department, Hungarian Natural History Museum, Budapest. Right pair of wings mounted as dry microscopic preparation. Caustic potash-treated abdomen and the remaining nart of the body are stored in a single airtight self-standing glass vial filled with 70% ethanol- 3 óparatypes, Tamdao, Vietnam, 1300 m, 11.10.1986, singled, leg. OLÁH along the main stream. 1 o" paratype, Tamdao, Vietnam, 16.10.1986, singled, leg. OLÁH at the water-fall of the main stream. 6 o

51 paratypes Tamdao, Vietnam, 13.10.1986, singled, leg. OLÁH along the spring brook of the main stream. Rhyacophila ranga sp. n. (Fig. 5) Male (in alcohol). General colour dark brown. Pleuron on thorax, legs, abdominal sternites pale brown. Antennae without visible annulation. Usual hyaline area on cross-veins r-m, m-cu and on the costal ending of cu

2 present and bright. Costal and subcostal area on fore wing light. Pterostigma a pronounced dark patch on both wings. Length and largest width of fore wing 6.9-2.4, those of hind wing 6.0-2.2 mm. Male genitalia. Abdomen with a short pointed process on seventh sternite. Ninth segment forms an almost equal long ring. Its dorsoapical lobe clavate in lateral aspect and bilobed with quadrate excision bearing an additional triangular minute sinus. Inner surface of the excised lobes granulöse and highly sclerotized. Preanal appendages egg-shaped, fused to the dorsoapical lobe by visible suture. Anal sclerites widely separated forming a slender Anger-like process with a heavily sclerotized apical portion and less sclerotized basal part joining to the preanal appendages with an internal root. Apical band absent, tergal band membraneous, hardly visible. Phallic apparatus complex. Phallotheca well developed,* the dorsum produced into a bifid hood over the aedeagus, apices being completely upcurved and pointed. Endotheca seems large but difficult to delimit.