0 0 ▁of ▁Britain ' s ▁ 1 0   km ▁squares ). ▁In ▁Britain , ▁the ▁moth ▁has ▁a ▁single ▁generation ▁per ▁year ▁– ▁adult s ▁are ▁on ▁the ▁wing ▁from ▁late ▁May ▁through ▁to ▁early ▁July . ▁ ▁Et ym ology ▁The ▁species ▁is ▁named ▁after ▁Charles ▁Bl omer , ▁who ▁was ▁born ▁in ▁ 1 7 7 8 ▁or ▁ 1 7 7 9 ▁and ▁died ▁in ▁ 1 8 3 5 , ▁and ▁studied ▁insect s ▁( pr inci p ally ▁in ▁South west ▁England ▁and ▁South ▁Wales ) ▁during ▁the ▁ 1 8 2 0 s ▁and ▁ 1 8 3 0 s . ▁He ▁discovered ▁the ▁species ▁in ▁Britain ▁( at ▁Castle ▁E den ▁D ene ▁in ▁County ▁Dur ham ) ▁during ▁this ▁time ▁and ▁it ▁was ▁named ▁after ▁him ▁in ▁ 1 8 3 2 . ▁ ▁Sub species ▁Ven us ia ▁bl omer i ▁bl omer i ▁( most ▁of ▁Europe , ▁across ▁Est onia , ▁Lat via , ▁Lith u ania ▁and ▁Russia ▁to ▁Japan , ▁northern ▁and ▁eastern ▁China , ▁North ▁America ) ▁Ven us ia ▁bl omer i ▁e uch lo e ▁Bry k , ▁ 1 9 4 9 ▁( K ore a ) ▁Ven us ia ▁bl omer i ▁s zech uan ensis ▁We hr li , ▁ 1 9 3 1 ▁( s outh - western ▁China ) ▁ ▁References ▁ ▁External ▁links ▁ ▁Bl omer ' s ▁Riv u let ▁at ▁UK M oth s ▁Le p if