Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 63. (Budapest 1971)

Papp, L. J.: The systematic position of Trachylopella kerteszi Duda and some remarks on the Hungarian species of Trachyopella Duda and Elachisoma Rond. (Diptera: Sphaeroceridae)

genus Trachyopella. I propose therefore to add some remarks on these species, and submit a key to the identification of the species hitherto found, or to be expected to occur, in Hungary. Trachyopella atoma RONDANI. — In his key, DTJDA (1938) wrote that the second costal section (mg

2

) is only about half as long as the third section (mg

3

). I have measured the ratios of the two sections in question in some animals, and found the following values: 0.583, 0.615, 0.647, 0.666, 0.666. I should remark that the specimens caught in Hungary are bigger and their wings decidedly darker than those captured at Wt. Wendel and received for study from the Rerlin Museum. Trachyopella melania HAL., and T. coprina DTJDA. — COLLIN clarified (1956) the taxonomical position, synonymies and characteristics of these two species. One of the results is the statement that after 1921, DTJDA considered his coprina (DTJDA, 1918) to be the species melania HAL., and introduced the name villeneuvei DTJDA (cf. DUDA, 1938) for the specimens actually relegable to melania HAL. I also observed the differences listed by COLLIN, and, based on these and the specimens lent by the Rerlin Museum, I have reidentified our material with the result that we possess no true coprina DUDA exemplars, though their occurrence is to be expected. Identification key to the Hungarian species of Trachyopella DUDA, 1918 1 (4) Vein c strongly thickened in second costal section. 2 (3) Third longitudinal vein bending in a well discernible arc to costal vein. Mesonotum shiny, wings milky white, veins paler. Second costal section about one and a quarter times as long as third section. Posterior femur with a short, upcurving apical anteroventral bristle. Dorsal praeapical bristle of posterior tibia shorter and never longer than width of tibia in the same place leucoptera HAL. 3 (2) Third longitudinal vein less adcurving to vein c. Mesonotum dull blackish, wings not whitish, veins more definite, darker. Second costal section at most as long as third section. Posterior femur without apical anteroventral bristle. Dorsal praeapical bristle of posterior tibia longer than width of tibia in the same place (minuscula COLLIN) 4 (1) Vein c not thickened in second costal section, hardly thicker than second longitudinal vein. 5 (8) Costal index invariably less than 0.7. 6 (7) Fifth longitudinal vein, though thin and colorless, almost reaching posterior margin of wing. Posterior tibia without long dorsal praeapical hair atoma ROND. 7 (6) Fifth longitudinal vein disappearing halfway between discoidal cell and alar margin. Posterior tibia dorsally with a long praeapical hair (kuntzei DUDA) 8 (5) Second costal section hardly shorter than, or equalling, third section. 9 (10) Fifth longitudinal vein almost reaching porterior margin of wing. Eyes visibly more pilose than in following species. Male hypopygium smaller, female cerci less extruding and more finely and shortly ciliate than in next species. Anterodorsal bristle of the three exterior bristles on lower half of median tibia almost as far above long dorsal bristle as the latter one from end of tibia melania HAL. 10 (9) Fifth longitudinal vein disappearing in front of hind margin of wing. Male hypopygium larger, female cerci more extruding and more strongly and elongately hairy than in preceding species. Eyes sparsely hairy. Anterodorsal bristle in lower half of median tibia arising perceptibly nearer to '20 TT. Múzeum Évkönyve 1971