S. Mahunka szerk.: Folia Entomologica Hungarica 58. (Budapest, 1997)

sus anteriorly without tooth (instead of toothed); in males, areae porosae developed on sternites II1-V (instead of III—VI, or III—VII). Of course, in the above case the question of the direction of the morphocline arises at once which leads often to controversial discussions. Two examples may explain this question. (1) Has the absence of campaniform sensilla on the metanotum to be interpreted as an economical progress because the sensilla on this sclerite might be not "needed" any more and their development can genetically be saved? Or does the absence of these sensilla means that the genetic condition of their being does not exist, has not been developed yet? And finally, the absence of the particular sensilla can also be interpreted in the way that their inherited genetic instruction "may simply fail to be expressed phenotypically" as Mound and Palmer (1981: 154) have stated in another context. (2) Regarding the areae porosae in males of minutissimus, is the presence of an area each on three sternites more progressive (advanced) than that on five sternites for the lower number might be more economically than the higher one? Or, contrary, is the outfit of only three sternites with an area an ancestral condition because a higher number of areae might help to improve the advantages in competitions with rivals? It is noteworthy that the females of all 14 European species with 8-segmented antennae have discal setae on sternites. Further on, seven of these species have in common the following four eidonomical characters (marked by an asterisk * in Table 3) which are regarded as ancestral too: (1) Sternites with discal setae, (2) pleurotergites with discal setae, (3) fore wings in distal half of anterior vein usually with more than five setae, and (4) tergite VIII on hind margin at least in females with a complete comb of microtrichia, except for in linariae Priesner (1928: 718). However, there is only one species with 7segmented antennae being equipped with the same four characters as just mentioned: minutissimus. Table 3. European Thrips species with 8-segmented antennae having some well marked characters in common. Characters present/complete (+), absent/incomplete (-); for asterisk (*) see the text Thrips species tu cd 8*o • o v EH CD gite; al se cd c/} ' c o E u 7±i t! CL eu c/i eU a> in -5 -1 «4-1 O § 1 ö o '3 G p T3 3 .c CH Xi 2 u B •z d D D T3 ctí 0-, ü o C z "O C 53 o U trie V 11 o C eu 1. atratus Haliday, 1836* + + + 6-9 6-10 + III-VII 2. fedorovi (Priesner, 1933)* + + + 9-1 1 9-15 + III -VII 3. floricola zur Strassen, 1995* + + + 9-11 1 1-20 III-VII 4. italiens (Bagnall, 1926)* + + + 3-6 4-10 + III-VII 5. linariae (Priesner, 1928)* + + + 5-7 6-10 III-VII 6. meridionalis (Priesner, 1926) + + + 3 3 + III-VI 7. oneillae (Titschack, 1968)* + + + 6-9 7-9 III-VI/VII 8.pm/(Uzel, 1895) + + 3 3 + III-IV/V 9. simplex (Morison, 1930) + + 5-8 5-10 + iri-VII 10. temperans zur Strassen, 1996 + 3 3 + III -VII 1 1. trybomi (Karny, 1908) + + + 3-4 3 + III-VII 12. verbascl (Priesner, 1920)* + + + 8-10 6 -9 + III-VII 13. vuilleti (Bagnall, 1933) + 3 3 III-VII 14. vulgatissimus Haliday, 1836 + + + 3-4 3 + III-VII