146 RK. W. CROSSKEY 
humeral callus 






humerals 
posthumerals 
prescutum 
notopleurals 
notopleuron presutural 
seta 
w—--—-=--—-—--O- 
transverse — 
suture supra-alars 
scutum intra-alars 
acrostichals 
dorsocentrals 

postalar callus postalars 
a 
supernumerary 
prescutellars 
preapical 
scutell 
scutellum telars 
marginal 
scutellars 


10 1] 
Fics 9-11. Thoracic dorsum of a Rutiliine fly. 9, terminology of sclerites (left side of 
mid line) and chaetotaxy indicated by pores (right side of mid line). 10 & 11, posterior 
view of scutellum showing level of insertions of marginal scutellar setae in Rutilia (10) 
and Formosia (11). All figures schematic and relative bristle sizes indicated approxi- 
mately by pore size shown (chaetotaxy very varied, forms may have more or fewer setae 
in any series than indicated or may lack some series completely: see discussion of 
taxonomic characters). 
