Apparently Non‐selective Characters and Combinations of Characters, Including a Study of Ultraviolet in Relation to the Flower‐visiting Habits of Insects

TABLE l2.-The Cuntbinafiuns of Ihe Rahos efldg, the Relative Length o/ thc Secorid o/ Three Submargtnal Cells, and aclab, the Relattue Disfunce of Ihe illarpual Cell Troltt he Apex of the Wziq.of the last submarginal cell nearer tlie proximal end.Thc cnnature of this vein is also important in taxonomy.As in the case of forms hn\ iiig two submarginal cells, it may be either straight, arched, or S-sliaped.wit11 all intermediates between these conditions.See figure 16 for sonic of these variations.* Becnusc of tllr ufillnlly dnntlng shnpe of tllh cell the length Is token ns the dlstnnce between the lower r~rvxlmal nnd the ripper dl~tlrl comers.