cal ▁du ct ▁directly ▁inserting ▁on ▁the ▁common ▁o vid uct , ▁is ▁consp ic uous . ▁ ▁Ad ult s ▁of ▁Par alloc ory n us ▁and ▁Rh op al ot ria ▁are ▁peculiar ly ▁soft - b od ied ▁and ▁possess ▁several ▁characteristic ▁tra its : ▁their ▁g ular ▁s ut ures ▁are ▁f used ▁to ▁a ▁single ▁s uture , ▁their ▁el y tra ▁cannot ▁be ▁locked ▁in ▁open ▁position ▁and ▁have ▁round ▁tips ▁between ▁which ▁the ▁pyg id ium ▁can ▁be ▁seen . ▁The ▁stern ite ▁of ▁their ▁mes oth or ax ▁sl ants ▁forward , ▁but ▁the ▁part ▁pro tr ud ing ▁between ▁the ▁second ▁leg ▁pair ▁is ▁not ▁raised . ▁Finally , ▁their ▁s per mat he cal ▁g land ▁and ▁s per mat he cal ▁du ct ▁form ▁a ▁common ▁t ube . ▁Al lo xy c ory n us ▁and ▁H yd nor ob ius ▁adult s ▁have ▁two ▁g ular ▁s ut ures ▁which ▁form ▁a ▁sem ic irc le ▁at ▁the ▁head ▁base ▁and ▁end ▁in ▁distinct ▁tips ; ▁their ▁el y tra ▁are ▁rib bed ▁length wise . ▁Ad ult s ▁of ▁Bal an op hor ob ius ▁and ▁O xy c ory n us ▁have ▁a ▁fl atten ed ▁h ind side ▁of ▁the ▁met ath or ac al ▁stern ite . ▁ ▁More ▁characteristic ▁are ▁the ▁lar va e . ▁Their ▁lab rum ▁has ▁two ▁sens illa ▁at ▁the ▁base ▁and ▁two ▁more ▁towards ▁the ▁center ▁of ▁the ▁forward ▁mar