Phtrs pnsylvnc, knwn by th cmmn nms Pnnsylvn frfly, lghtnng bg, dt-dsh frfly nd (n ts lrvl stt) glwwrm, s spcs f frfly frm th ntd Stts nd Cnd. t s ls wdly knwn ndr th Ltn nm Phtrs pnnsylvnc, lthgh th rgnl spllng, wth n "n", ws cmmn n Ltnzd nms f th tm nd rmns th vld nm.