he astern ▁snow fly , ▁is ▁a ▁species ▁of ▁small ▁winter ▁stone fly ▁in ▁the ▁family ▁Cap ni idae . ▁It ▁is ▁found ▁in ▁North ▁America . ▁Descri bed ▁by ▁Edward ▁New man ▁in ▁ 1 8 3 9 , ▁it ▁was ▁the ▁first ▁known ▁insect ▁in ▁the ▁genus ▁Par ac ap nia . ▁It ▁is ▁syn onymous ▁with ▁Par ac ap nia ▁curv ata ▁( H anson , ▁ 1 9 4 6 ). ▁ ▁References ▁▁ ▁De W alt ▁R , ▁C ao ▁Y , ▁Tw ed dale ▁T , ▁Gr ub bs ▁S , ▁Hin z ▁L , ▁P ess ino ▁M , ▁Robinson ▁J ▁( 2 0 1 2 ). ▁" Oh io ▁USA ▁stone f lies ▁( In sect a , ▁Ple cop tera ): ▁species ▁rich ness ▁estimation , ▁distribution ▁of ▁functional ▁n iche ▁tra its , ▁d rain age ▁affili ations , ▁and ▁relationships ▁to ▁other ▁states ". ▁Z oo Keys ▁ 1 7 8 : ▁ 1 - 2 6 . ▁ ▁Further ▁reading ▁▁▁▁ ▁Category : P le cop tera <0x0A> </s> ▁Pop ulus ▁× ▁can esc ens , ▁the ▁grey ▁pop lar , ▁is ▁a ▁hy brid ▁between ▁Pop ulus ▁al ba ▁( white ▁pop lar ) ▁and ▁Pop ulus ▁trem ula ▁( common ▁as pen ). ▁It ▁is ▁intermediate ▁between ▁its ▁parents , ▁with ▁a ▁thin ▁grey ▁down y ▁ ▁co ating ▁on ▁the ▁leaves , ▁which ▁are ▁also ▁much ▁less ▁deeply ▁lo bed ▁than ▁the ▁leaves ▁of ▁P .   al