Four new species of Saigusaia Vockeroth, 1980 (Diptera: Mycetophilidae) from China Author Niu, Xiaoling Author Wu, Hong Author Yu, Xiaoxia text Zootaxa 2008 1741 24 30 journal article 10.5281/zenodo.181508 eb75953f-2539-4919-bcde-1d32169d2ee2 1175-5326 181508 Key to the species of Saigusaia Vockeroth 1980 known from China 1. Tergite IX broadened apically ( Figs. 3, 5 , 7,9); hypopygium not elongate, gonostylus simple ( Figs. 7–8 ) or with posterior protuberance bearing at most 1 black spine.........................................................................2 -. Tergite IX weakly tapered apically ( Fig. 1 ); hypopygium elongate ( Fig. 2 ); gonostylus with strong thumblike lateral protuberance bearing two long black spines ............... Saigusaia aberrans Wu et Niu , sp. nov. 2. Shoulders, proepisternum, meskatepisternum yellow.................................................................................3 - Shoulders, proepisternum, meskatepisternum blackish brown....................................................................4 3. Gonostylus strongly swollen distally, lacking strong thumb-like lateral spine-bearing protuberance ( Figs. 3-4 ); ventral portion of tergite IX broadly emarginate (Fig. 12). Saigusaia praegnans Wu et Niu , sp. nov. - Gonostylus slightly swollen apically, with strong thumb-like lateral protuberance bearing one long black spine ( Figs. 5-6 ); ventral portion of tergite IX narrowly emarginate (Fig. 13) ............................................. ................................................................................................. Saigusais monacanthus Wu et Niu , sp. nov. 4. Gonostylus with small indentation on posterolateral margin at its mid-length and two rows of short spinelike setae apicomedially ( Fig. 7 ) ........................................... Saigusais spinibarbis Wu,Yu et Niu , sp. nov. - Gonostylus simple, normal ( Fig. 9 ) ........................................................... Saigusaia taiwan Saigusa, 1968