KEY TO GUATEMALAN SPECIES OF RADDAUS PRETZMANN, 1965

1. G1 with cephalic surface of distal portion bearing one subdistal spine (Fig. 6B, E); mesial process bilobed, enlarged, as wide as or wider than width of main stem in mesial view (Fig. 6A, D) ......................................... 2

— G1 with cephalic surface of distal portion bearing two subdistal spines (Fig. 6G, H); mesial process unilobed, slightly narrower than width of main stem in mesial view (Fig. 6F) ................ R. tuberculatus (Rathbun, 1897)

2. G1 with mesial process trapezoidal, roughly as wide as main stem in mesial view; mesial process with proximal and distal lobes rounded, distal one narrowest (Fig. 6A) ....................... R. bocourti (A. Milne-Edwards, 1866)

— G1 with mesial process subretangular, wider than main stem in mesial view; mesial process with proximal and distal lobes as subtriangular tooth, distal one smallest (Fig. 6D) ............................... R. mertensi (Bott, 1956)