  When conducting inter-species regression analyses, the phylogenetic
relationships between the individual species need to be taken into account. In
this paper, a procedure for conducting such analyses is proposed, which only
requires the use of a measure of relationship between pairs of species, rather
than a complete phylogeny, and which at the same time assesses the importance
to be attached to the relationships with regard to the conclusions reached. The
procedure is applied to previous data, relating testis size to mean hind tibia
length, duct length and spermathecal area in 15 species of Scathophagidae.
