144 R. W. CROSSKEY 
vertex 



interfrontal parafrontal 
area 
eye 
arista 
antenna 

parafacial 
facial carina 
epistome gena 
occiput 
postorbit 
postbucca 

genal dilation 
2 3 
Fics 1-3. Head of a Rutiliine fly. 1 & 2, laterodorsal and profile views showing the 
terminology of main landmarks (vestiture omitted). 3, profile showing weak frontal 
bristling and vibrissae of typical forms. 
