Dufour 1990. Tipula (Acutipula) nevada sp. n. and Tipula (Savtshenkia) invenusta microinvenusta ssp. n. from the heights of Sierra Nevada in Spain (Diptera: Tipulidae). Mitteilungen der Schweizerischen Entomologischen Gesellschaft, 63(1-2) 1990: 227-232