Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 79. (Budapest 1987)

Więźlak, W. W.: Potamodytes lokis sp. n. from Tanzania (Coleoptera, Limniidae)

ANNALES HISÍORÍCO-NATURALES MUSEI NATIONALES HUNG AR ICI Tomus 79. Budapest, 1987 p. 119-120. Potamodytes ïokis sp. n. from Tanzania (Coleoptera, Limniidae) by W. W. WIEZLAK, Warszawa W. W. WIEZLAK: Potamodytes lckis sp. n. from Tanzania (Coleoptera, Limniidae). — Annls hist, nat. Mus. natn. hung. 1987 79: 119-120. Abstract — A new species of the genus Potamodytes GROTJVELLE, P. lokis, is described from Tanzania. With 6 figures. So far 36 species have been described in the genus Potamodytes (WIEZLAK 1987), however, only one, P. africanus (BOHEMAN), is known from Tanzania. Below I give the description of the new species found in the Usambara Mountains, Tanzania. I would like to express my sincere thanks to DR. O. MERKL (Hungarian Natural History Museum, Budapest) for a loan of specimens. Potamodytes lokis sp. n. rf 9 (Figs 1- 6) Holotype cf. — Body length 9.80 mm, greatest width at humeri 2.65 mm. Body black, nearly uniformly densely tomentose, tarsal claws reddish brown. — Head with two shallow impressions near inner eye margin; clypeus and front nearly glabrous; very sparsely micropunctured, distances between punctures are 2-5 times of their diameters, other parts of head densely tomentose; produced portion of genae not very prominent, its length equals two-thirds of an eye diameter, its width onefourth. — Pronotum trapezoid (Fig. 1), both at base and apex broader than long (2.57: 1.61: 1.41 mm.); anterior margin weakly arcuate, sides with conspicuous but very narrow lateral ridge; apical transverse groove complete and distinct, longitudinal furrow in midline complete, reachingapical transverse groove, bifurcated basally enclosing a triangular impression ; basal sulci very short; basal angles produced, reflected upwards to form an angle of 30° with the pronolal surface. — Elytra nearly three times longer than wide (7.80: 2.65 mm); humeri gibbous, separated by depressed 7th and 6th intervals from more elevated 2nd-5th; this gibbosity is present only on the length of accessory striae; rows of punctures well marked; apices as in Fig. 2. —• Prosternai process as in Fig. 4. — Aedeagus as in Fig. 6. Allotype 9 - — Externally similar to the holotype, but shows the following differences: body length 10.40 mm, width at humeri 2.80 mm, prcnotal impressions more distinct than in male, elytral gibbosity more elevated on 3rd-5th intervals, elytral apex as in Fig. 3, prosternai process as in Fig. 5. Variations — Body length 9.70-11.10 mm. Apical portion of median lobe of paratypes possess two small sclerotized teeth, instead of one, as in holotype (shown by arrow in Fig. 6). Holotype (rf) and allotype ($): Tanzania, W. Usambara Mts., Mazumbai University Field Station, 1520 m alt., at light, 2.02.1985, leg. Peregovits (in the Hungarian Natural History Museum, Budapest). — Paratypes 2 rf and 2 9 • same data as for holotype (in coll. HNHM, and in the collection of author). I do not give the assignment of the new species to any of the species groups as I have done recently (WIEZLAK 1987), because the genus has never been divided to these groups formally. The brief descriptions of species do not allow, in some cases, any rational grouping of the species. If we take, after DELÈVE (1973), the criterion of the shape of the parameres and the elytral apices, Potamodytes lokis sp. n. could be compared with P. sericeus DELÈVE or P. bisul-