Yes, this is pf. pass. 3 sg. There is nothing irregular about this form at
all: (1) All contract verbs lengthen the stem vowel (A --> H, E --> H, O
--> W) in all tense-stems outside the present, so here, principal parts:
PSUCHOW, PSUCHWSW, EPSUXWSA, EPSUCHWKA, EPSUCHWMAI, EPSUXWQHN
(2) When you have a double consonant like the Psi here, consisting of stop
+ S, you get an augment instead of reduplication.
Carl W. Conrad
Department of Classics, Washington University
One Brookings Drive, St. Louis, MO, USA 63130
(314) 935-4018
cwconrad@artsci.wustl.edu OR cwc@oui.com
WWW: http://www.artsci.wustl.edu/~cwconrad/