Chemical compositions are derived from high-resolution spectra for five field SRd variables .
These supergiants not previously analysed are shown to be metal-poor : KK Aql with [ Fe/H ] = -1.2 , AG Aur with [ Fe/H ] = -1.8 , Z Aur with [ Fe/H ] = -1.4 , W LMi with [ Fe/H ] = -1.1 , and WW Tau with [ Fe/H ] = -1.1 .
Their compositions are , except for two anomalies , identical to within the measurement errors with the compositions of subdwarfs , subgiants , and less evolved giants of the same [ Fe/H ] .
One anomaly is an s -process enrichment for KK Aql , the first such enrichment reported for a SRd variable .
The second and more remarkable anomaly is a strong lithium enrichment for W LMi , also a first for field SRds .
The Li i 6707Å profile is not simply that of a photospheric line but includes strong absorption from red-shifted gas , suggesting , perhaps , that lithium enrichment results from accretion of Li-rich gas .
This potential clue to lithium enrichment is discussed in light of various proposals for lithium synthesis in evolved stars .

Subject headings : stars : abundances – stars : variables : other ( SRd ) – stars : AGB and post-AGB