Nymphs

Host plant *Crataegus*
circumanal ring consisting of	capitate setae on dorsum of caudal plate	number of capitate setae on margin of forewing bud	back

one row of pores	present	variable	C. affinis

one row of pores	absent	> 5	C. crataegi

one row of pores	absent	< 5	C. melanoneura

several rows of pores	absent	absent	C. peregrina

Host plant *Malus*
circumanal ring consisting of	setae on antennal segment

one row of pores	shorter than diameter of segment	C. melanoneura

several rows of pores	shorter than diameter of segment	C. mali

one row of pores	apical seta longer than diameter of segment	C. picta

Host plant *Pyrus*
number of marginal sectasetae on caudal plate	number of long capitate setae on margin of forewing bud

0	1-3	C. bidens

0	1	C. pyri

0	2-3	C. pyricola

3+3	absent	C. pyrisuga

Host plant *Sorbus*
circumanal ring consisting of	capitate setae on dorsum of caudal plate	long capitate setae on wing buds	number of marginal sectasetae on caudal plate

one row of pores	long	absent	3+3	C. albipes

one row of pores	long	present	3+3	C. breviantennata

one row of pores	short	absent	0	C. corcontum

several rows of pores	absent	absent	2+2	C. sorbi