1914] Muscoid and Anthomyioid Flies. 167 
It appears from the foregoing that the most serviceable 
characters for defining the natural boundary between Musca 
and Anthomyia will be found in the egg, first-stage maggot, 
male reproductive system, chaetotaxy and pilotaxy; while the 
venation, thoracic sclerites, female reproductive system and 
hypopygium will furnish supplementary characters of value. 
The indications from the very incomplete data which it 
has been possible to present are that Musca is much more 
nearly related to Calliphora than to Anthomyia, but final 
judgment must be reserved until all the main types con- 
cerned can be investigated and the results compared and 
correlated. The present meager notes will form a starting 
point for an extended study of the subject. 
