▁Vari ation ▁in ▁the ▁mark ings ▁is ▁extensive . ▁The ▁bands ▁on ▁the ▁fore ▁wings ▁become ▁less ▁and ▁less ▁complete , ▁until ▁they ▁are ▁reduced ▁to ▁a ▁series ▁of ▁mere ▁rings ▁around ▁the ▁black ▁d ots . ▁The ▁black ▁d ots ▁decrease ▁in ▁size ▁and ▁in ▁number ▁until ▁they , ▁together ▁with ▁the ▁ta wn y ▁mark ing , ▁entirely ▁disappear , ▁and ▁a ▁plain ▁black ish - b rown ▁insect ▁only ▁remains . ▁This ▁extreme ▁form ▁has ▁been ▁named ▁ob sole ta , ▁T utt . ▁The ▁earliest ▁rings ▁to ▁van ish ▁seem ▁to ▁be ▁the ▁third ▁on ▁the ▁fore ▁wings ▁and ▁the ▁first ▁on ▁the ▁h ind ▁wings . ▁Similar ▁modifications ▁occur ▁on ▁the ▁under ▁side ▁also , ▁but ▁there ▁may ▁be ▁aber r ation ▁on ▁the ▁upper ▁side ▁of ▁a ▁spec imen , ▁and ▁not , ▁or ▁at ▁least ▁not ▁in ▁the ▁same ▁way , ▁on ▁the ▁under ▁side ." ▁ ▁Early ▁stages ▁ ▁" The ▁egg ▁when ▁first ▁laid , ▁is ▁yellow , ▁changing ▁afterwards ▁to ▁fa wn ▁colour ▁with ▁dark er ▁mark ings , ▁especially ▁towards ▁the ▁top . ▁It ▁is ▁laid ▁in ▁July ▁on ▁bl ades ▁of ▁grass . ▁The ▁lar va ▁h atch es ▁in ▁about ▁six teen ▁days . ▁The ▁young ▁c ater p ill ar , ▁before ▁hi bern ation ▁in ▁October , ▁is ▁green ish , ▁with ▁dark er ▁green ▁and ▁yellow ▁lines . ▁Head ▁brown ish . ▁Fe eds ▁in ▁July ▁and ▁after ▁hi bern ation ▁on ▁various ▁grass es , ▁among