Description of sexuales of Brachycolus cucubali (Passerini, 1863) (Hemiptera aphididae)

The hitherto unknown oviparous females and apterous males of Brachycolus cucubali (Passerini, 1863), living in pseudogalls on Silene vulgaris (Moench) Garcke, (1869) (Caryophyllaceae), are described based on material from the North-West of Iberian Peninsula (Province of León). Sampling and morphometric data are given for every morph. Also, field data of monitored Brachycolus cucubali colonies are reported and information of polyphenism in males is discussed.Peer reviewe