Table 1 in Revision of the Merodon serrulatus group (Diptera, Syrphidae)

Table 1. Inter- and intrapopulation variability of Merodon serrulatus.
CharacterVariability (intra- and/or interpopulation)IntraIntercolor of antennafrom black to brown+-length of basoflagellomere1.7-2.2 times as long as wide++ shorter in Balkans populations (1.7-1.9)position of antennal fossette in maledorsal to lateral or dorsal and medial (Fig. 3)++ Iberian populations with medial fossettelength of arista1.0-1.5 times as long as basoflagellomere-+ longer in Balkans populations (1.4)ocellar triangle in maleequilateral or isosceles+-microtrichose vittae on scutumfrom 2-4, posterior half dull without microtrichia+-black pile on scutumfew, or fascia of black pile between wing basis, or many black pile on scutum+-color of pile on metafemur in maleall yellowish to whitish or with many black in apical one third++ some Iberian populations with only pale pilelength of pile on metafemur in maleone third to one fifth of width of metafemur++ in eastern populations (southern Russia to Siberia) longer, from one third to one fourth of width of metafemurcolor of knees, apex of tibiae and tarsifrom black to brown+-lateral maculae on tergum 2distinct, indistinct, to almost absent+-pile on terga 3-4 in malefrom all pale yellow to many black++ Balkans populations with more black pilemicrotrichose vittae on frons in femalefrom narrow unconnected to broad and connected near ocellar triangle+-color of pile on frons in femalealmost all black to mostly whitish+-male genitaliathe shape of surstyle and size of area covered with dense short marginal setulae on anterior surstyle lobe (Figs 1, 6)++ in eastern populations (southern Russia to Siberia) basolateral protrusion less distinct (Fig. 6G)