S. Mahunka szerk.: Folia Entomologica Hungarica 64. (Budapest, 2003)

Metasoma equal or slightly shorter than head+mesosoma; all tergites with dense lateral band of white setae; tergite two occupies 0.5-0.75 of metasoma in dorsal view; subsequent tergites densely punctate. Ventral spine of hypopygium slender, prominent part 3.5-5.5 times as long as broad, with very few short sparse setae. Variability - Andricus kollari is a highly variable species, both morphologically and cecidologically. Three main aspects are strongly varied in the wasp's morphology and general appearance: the body colour (from yellow to dark brown), the number of antennái flagellomeres (from 10 to 12) and general pubescence of mesosoma, particularly density of setae prolong the median scutal line, the bottom of scutellar foveae. The variability of the gall is commented below. Gall. Spherical, lignified gall, without pubescence, greatly variable in size from 8 to 30 mm, with wide range of protuberances' development, from their absence (typical form) or only very slight to distinctly developed ones. Folliot (1964) explained it by the presence of a recessive gene in A. kollari populations or as a result of hybridization with other closely related species. Often, but not always, small-sized galls are due to an early attack by a parasitoid/inquiline or both, but not always (Niblett 1941). In a cross-section the gall has a radial parenchymatic structure surrounding the central larval chamber. Galls were described in details by many authors (Hartig 1843, Mayr 1870, Kieffer 1897-1901, Trotter & Cecconi 1900, Houard 1908, Dalla Torre & Kieffer 1910, Riedel 1910, Tavares 1930, Ambrus 1974, Quinlan 1974, Csóka 1997, among many others). Diagnosis - This species belongs to the complex of 5 closely related species: A. kollari/A. hispanicus, A. infectorius, A. sternlichti and A. caliciformis. All 5 species are characterised by strongly outwards bent lateral propodeal carina, with the central propodeal area pubescent prolong lateral carinae in the upper corners, scutellar fovea are not limited posteriorly and separated by a narrow carina (Figs 5-7). Galls of all 5 species are globular. It is difficult to separate these species, especially because of the high variability range of some morphological characters. Andricus kollari and A. hispanicus are sibling species and the asexual females and galls could not be separated morphologically, however, their biology is different (Pujade-Villar, Folliot & Bellido 2003). Unlike A. infectorius and A. sternlichti the gena is less broadened behind the compound eye (Fig. 19) and notauli are complete, uniformly deep prolong entire length. See also the key to species. The structure of the gall is very important diagnostic character for this species is. The surface of the gall is normally smooth, a cross section shows the radiating soft parenchymatic tissue surrounding the central larval chamber.