Descriptions of four hitherto unknown or little-known morphs of Siphini (Hemiptera, Aphidoidea: Chaitophorinae) Author Wieczorek, Karina text Zootaxa 2011 2756 53 60 journal article 10.5281/zenodo.207994 498b1da5-6ca0-4f46-ba86-adc5d9a081bb 1175-5326 207994 Key to known alate viviparous females of the subgenus Sipha 1. Body not covered with rows of spinules.................................................................... 2 -. Body densely covered with rows of short, robust spinules...................................................... 3 2. Antennae 0.70 mm long, 0.48 times body length.................................... S. (S.) agropyronensis (Gillette) -. Antennae 1.02–1.18 mm long, 0.60–0.62 times body length.................................... S. (S.) flava (Forbes) 3. Apical segment of rostrum 0.25–0.27 times antennal segment III and 0.50 times HT II........ S. (S.) glyceriae (Kaltenbach) -. Apical segment of rostrum 0.45–0.52 times antennal segment III and 0.64–1.00 times HT II........ S. (S.) littoralis (Walker)