  Delta Sct - gamma Dor hybrids pulsate simultaneously in p- and g-modes, which
carry information on the structure of the envelope as well as to the core.
Hence they are key objects for investigating A and F type stars with
asteroseismic techniques. An important requirement for seismic modeling are
small errors in temperature, gravity and chemical composition. Furthermore, we
want to investigate the existence of an abundance indicator typical for
hybrids, something that is well established for the roAp stars. Previous to the
present investigation, the abundance pattern of only one hybrid and another
hybrid candidate has been published. We obtained high-resolution spectra of HD
114839 and BD +18 4914 using the SOPHIE spectrograph of the Observatoire de
Haute-Provence and the HARPS spectrograph at ESO La Silla. For each star we
determined fundamental parameters and photospheric abundances of 16 chemical
elements by comparing synthetic spectra with the observations. We compare our
results to that of seven delta Sct and nine gamma Dor stars. For the evolved BD
+18 4914 we found an abundance pattern typical for an Am star, but could not
confirm this peculiarity for the less evolved star HD 114839, which is
classified in the literature as uncertain Am star. Our result supports the
concept of evolved Am stars being unstable. With our investigation we nearly
doubled the number of spectroscopically analyzed delta Sct - gamma Dor hybrid
stars, but did not yet succeed in identifying a spectroscopic signature for
this group of pulsating stars. A statistically significant spectroscopic
investigation of delta Sct - gamma Dor hybrid stars still is missing, but would
be rewarding considering the asteroseismological potential of this group.
