Psitaci or Psittaci: How To spell?
The word Psitaci is misspelled against Psittaci, a noun meaning "The order of birds which comprises the parrots."
Psittaci has double "tt" is mispronounced as "t"Remember double 'TT' in between the strings psi & aci which should not be misspelled with single 'T'
Wrong Spelling:  psi-t-aci  Correct Spelling:  psi-tt-aci 
Find more wrongly spelled words of Psittaci to spell it well.