antenna blue butterfly display flower forewing fringe hindwing insect Italy Lepidoptera little Lycaenidae nature small small butterfly summer tiny trefoil veins wing England orange rest rhopalocera skipper small skipper Surrey Thymelicus sylvestris brimstone diptera fly Gonepteryx rhamni greenbottle Leguminosae pink sweet pea visit animal Arthropoda british compound eye dainty delicate eye fragile Insecta leg Leptidea sinapis perch Pieridae rare scale scales scarce sit underside vein venation wood white ala América del Sur anaranjado black Danaus detail detalle dots erippus macro mariposa monarca Monarch outdoors plexippus polka dots south america spots Sudamérica Suramérica texture white