Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 93. (Budapest 2001)

Csősz, S.: Taxonomical and distributional notes on two new and a rare Leptothorax Mayr, 1855 species for the Hungarian ant fauna (Hymenoptera, Formicidae)

Metrical data of a unique queen. HL: 730, HW: 700, Fr: 230, SI: 495, ML-spin: 1200, ML-lobus: 1250, MH: 670, CI: 1,04, HW/Fr: 3.04, MI: 1.79 Description - Antennae with 12 segments, antenna! club always distinctly darker than rest of funiculus. Dorsum of alitrunk without a visible mesopropodeal impression. Propodeum with blunt, short pointed teeth gently curved downwards. Frontal and dorsal profile of petiole always rounded, never meeting in angle. Colour of head dark brown or black with lower parts brownish yellow, or brown. Alitrunk brown, or dark red, at least central part of femora brown. Gastral tergites brown except first tergite which is yellow at the base. Head strongly sculptured, frons striated longitudinally, without smooth and shining median parts. Dorsum of mesosoma strongly rugose. Note - The workers and queens of L. nigriceps MAYR are easy to confuse with its sibling species, L. tuberum (FABRICIUS, 1775). L. tuberum is uncommon, but widely distributed in Hungary. Some distinctive characters have been presented hereunder for recognition of L. tuberum and L. nigriceps. Colour: L. nigriceps usually darker than its sibling species. Head of L. tuberum light to dark brown, alitrunk brownish yellow. At least the middle part of the femora of L. nigriceps always brown, in contrast with the femora of L. tuberum, which are yellow or dark yellow, without darker band in the middle. Gastral tergites of L. nigriceps are dark, with the exception of the base of the first tergite, wich is yellow at base only (Fig. 1 ). The anterior half of first gastral tergite of L. tuberum is yellow (Fig. 2). Figs 1-2. Gastral tergites of Leptothorax species. 1 = L. nigriceps MAYR, 1855. First tergite is yellow at base only; 2 = L. tuberum (FABRICIUS, 1775). The anterior half of first tergite is yellow