. British journal of entomology and natural history. Natural history; Entomology. BR. J. ENT. NAT. HIST., 9: 1996 143 8. Donacia marginata Hoppe, 1795 ( = limbata Panzer, 1796; lemnae Fabricius, 1801). (Latin: marginata, provided with a border, probably referring to the elytra which usually have a reddish-purple lateral border). L = mm; Plate I, Figure 8. This handsome beetle is of a golden-bronze colour with reddish-purple disc- patches and lateral borders to the elytra. It is often found in large numbers, resting on and eating the upper epidermis from the leaves of the branched bur-
. British journal of entomology and natural history. Natural history; Entomology. BR. J. ENT. NAT. HIST., 9: 1996 143 8. Donacia marginata Hoppe, 1795 ( = limbata Panzer, 1796; lemnae Fabricius, 1801). (Latin: marginata, provided with a border, probably referring to the elytra which usually have a reddish-purple lateral border). L = mm; Plate I, Figure 8. This handsome beetle is of a golden-bronze colour with reddish-purple disc- patches and lateral borders to the elytra. It is often found in large numbers, resting on and eating the upper epidermis from the leaves of the branched bur-reed {Sparganium erection L.) growing at the margins of lakes, ponds, canals and dykes, generally with a preference for still water. The adults of this species enjoy a long season, first appearing about the middle of May but recorded most frequently in June, July and August. Although of very similar size and shape to D. bicolora and D. obscura, D. marginata can in most cases be differentiated on the basis of coloration. D. bicolora is usually of a uniform brilliant golden-green colour; like D. marginata it is associated with Sparganium erection, but prefers plants growing along the margin of running water (rivers). D. obscura is of a uniform dull bronze colour, and is associated with Carex rather than Sparganium. The coloured dorsal elytral markings of D. marginata may occasionally be entirely missing, in which case the strong dorso-lateral and lateral pronotal rugosities can be used to separate it from other species such as D. bicolora and D. obscura. A widespread, locally common species with post-1970 records for Scotland, Dyfed-Powys and S. Wales, E. Midlands and all regions of Southern England. 8 Donacia marginata Hoppe. 4^ 1970 ONWARDS VICE-COUNTY DISTRIBUTION. PRE 1970 (=26): 1;4;9; 10; H; 12; 13; 14; 15; 16; 17; 18; 19; 21; 22; 23; 26; 27; 29; 33; 38; 41; 52; 58; 61; 64. 1970 ONWARDS (= 16): 1; 3; 5; 6; 11; 12; 13; 14; 15; 17; 22; 27; 41; 44; 53; 72. 9. Donacia bico
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