346 
Mallophaga from Marsupials 
included in Menopon by Piaget, and only grudgingly allowed generic 
rank by Neumann (1913, p. 634), because of its superficial resemblance 
to the latter genus. We wish, therefore, to lay stress on the homo¬ 
geneity of the Boopidae, and on the wide gulf which separates this 
family from the Menoponidae, and other bird-infesting Amblycera on 
the one side, and from the Trimenoponidae of rodents on the other. 
These points of difference will be dealt with fully in a forthcoming 
morphological paper by one of us (L. H.). Here we simply repeat that 
they consist essentially in the structure of the 3 internal genitalia, and 
in the structure, not the mere possession, of the distinct mesothorax. 
The close relation between Boopia and Heterodoxus is further emphasised 
by their possession in common of three pairs of sensory organs upon 
the first three abdominal segments. 
