Insects of Britain and Ireland: the families of Hemiptera

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L. Watson and M. J. Dallwitz



Salient features of adults. Terrestrial (in coastal and other sandy places).

Phytophagous (on legumes). Large; about 11 mm long; fliers; emitting repugnatorial liquid as a defence reaction; with narrow-elongate bodies; conspicuously stilt-legged to not stilt-legged. Head non-linear. Rostrum clearly separated ventrally from the prosternum by a sclerotized gula; 4 segmented. Antennae from the upper part of the head (dorsal of a line from centre of eye to apex of head); longer than the head, readily visible from above; 4 segmented (the terminal segment characteristically slightly curved); non-aristate. Ocelli present; 2. Scutellum relatively small. Metathorax with a scent-gland opening, comprising a funnel surrounded by a dull patch of elaborately sculptured cuticle, visible laterally on either side (? - cf. Coreidae). Fore-wings well developed to vestigial or absent (?); when macropterous, differentiated into a basally thickened and a distally membranous region; of macropters, with a clavus. Membrane of the hemelytron with numerous veins reaching or almost reaching the margin. Tarsi 3 segmented. Pulvilli present. The abdomen without ventral silvery pubescence. The second dorsal abdominal scent gland aperture not displaced into the fifth tergite, and distant from the first gland.

Grey-brown to almost black, with the upper surface of the abdomen orange-red; hind femora clubbed. The nymphs ant-like.

Taxonomy. Suborder Heteroptera; Coreoidea.

British representation. 1 species in Britain (A. calcaratus); genera 1. Alydus. E.g., Alydus calcaratus (Black-and-red Bellied Alydus).

Illustrations. • Alydus calcaratus (Black-and-red Bellied Alydus: B. Ent. 369). • Alydus calcaratus (detail: B. Ent. 369). • Alydus calcaratus (dissections: B. Ent. 369). • Alydus calcaratus (legend+text: B. Ent. 369). • Alydus calcaratus (text: B. Ent. 369, cont.). • Alydus calcaratus (Southwood & Leston). • Alydus calcaratus, with unrelated taxa: Saunders, 1892..

To view the illustrations with detailed captions, go to the interactive key. This also offers full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, and distributions of character states within any set of taxa.

Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2003 onwards. Insects of Britain and Ireland: the families of Hemiptera. Version: 16th May 2016.’.