Description of sexuales of <i>Sipha (Sipha) littoralis</i> (Walker, 1848) (Aphididae: Chaitophorinae) with remarks on its distribution and host plants

Walker (1848) described Aphis littoralis from dry preserved viviparous apterous females, oviparous apterous females and apterous males and he wrote: “I have not observed yet any outwards difference between viviparous and oviparous form” and with reference to male: “it appears with the oviparous female at the end of October, but is comparatively scarce : the body is brown, and slightly increases in breadth from the head till near the tip of the abdomen : the feelers are about half the length of the body.” The specimens of A. littoralis from the Dry Collection of Francis Walker have been mounted and the viviparous females redescripted by Laing (1921), who placed the species into the genus Sipha. The Dry Collection contained four apterous viviparous females and two larvae labelled littoralis Walker, an adult from the labelled series has been marked as a type; however, no specimens of males or oviparae have come to light (Doncaster 1961).Viviparous apterous females have been also redescripted by Theobald (1929), Stroyan (1977) and Heie (1982), but sexuales have never been described. 2. Material and methods