4. Variation of Dyar’s r of head capsule growth among 33 samples of Erebia species arranged by increasing values. 5. Variation of the growth constant k for head capsule growth among 33 samples of Erebia species arranged in order of increasing values. Bar types indicate species samples with different numbers of larval instars according to the groups defined in Tables 2, 3. Black: 6 instars. Dark grey: 5 instars. Light grey: 4 instars. Shaded bars refer to subgroups 4B and 5A as defined in the text (see Tables 3, 4).