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Not all verbs have all the principal parts listed.
Why are some missing principal parts indicated with a dash while others are just skipped over. See page 99 and compare ἐπισσεύω and κοτέω.

Bert wrote:Why are some missing principal parts indicated with a dash while others are just skipped over. See page 99 and compare ἐπισσεύω and κοτέω.

The dash means no such form is attested.

If only a few forms are given, it usually means the remaining forms are completely regular (usually the case for contract verbs). However, I'd probably not use Pharr as the judge of that. I always check Cunliffe or L&S when I feel I absolutely have to know for sure.