Cantharis lateralis Linnaeus, 1758

Female
Widely distributed throughout southern England and the midlands to south Yorkshire with a few scattered records from the west country, west Wales, East Anglia and the north (Alexander) Adults first appear during May and are associated with damp grassland and marshland, by July or early August they seem to become adventitious and may be found in most situations. Often seen on umbels in suitable habitats, usually alone or in small numbers, and will occur regularly in the sweepnet. May be expected anywhere near the canal or the various river systems around Watford, sweeping the marginal vegetation around the watercress beds in Cassiobury park nature reserve during May and June will almost certainly produce them. In our experience of Watford not found later than early August.

The distinctive elytral colouring will identify this species in the field. 5-7mm. Antennae pubescent, dark with 3-5 basal segments variously lighter. Palps yellow, terminal segment triangular. Head dark from base to middle of eyes, finely punctate and pubescent, clypeus convex between eyes. Eyes smaller and more protruding in female, temples at least as long as eyes and tapering towards pronotum, more strongly so in the female. Pronotum yellow, occassionally with dark marks on disc, transverse, more so in male. Front margin rounded (cf. Podabrus), sinuate laterally in front of obtuse hind angles which are usually distinct. Lateral margin explanate anteriorly, hind margin strongly bordered. Finely punctate and pubescent throughout. Elytra black with reflexed margins narrowly yellow, generally visible from above along middle third, weakly cross strigose and with short, dense recumbent pubescence as well as much longer semi-erect pubescence over entire surface giving a silvery metallic effect in strong light. In female weakly dilated behind middle. Legs yellow, hind tibiae in male distinctly darkened around middle, indistinctly so, if at all, in female. Third segment of meso and meta tarsi strongly bilobed. Anterior claw of each pair toothed at base.

Description from 4 Watford specimens at X20


Female

Male

Female

Male

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