EXPLANATION OF FIGURE 34. 



Syrphus nitens Ztt. 



1 Dorsal view of larva x 7.5 ; A, antenna ; B, posterior respiratory- 

 organ. 



2 Anterior larval spiracle, highly magnified. 



3 End view of posterior respiratory organ x 75, showing the two 

 stigmal plates ; A, circular plate ; B, one of the inter-spiracular 

 nodules ; C, median slit-like spiracle. 



4 Postero-ventral view of posterior respiratory organ x 75, showing 

 the position of the three pairs of extensively-convoluted, slit-like 

 spiracles; the carinas on which they are elevated; and the ridges 

 median to the circular plates. 



5 The retractile, renal ? flabellse, as protracted from the anal opening. 



6 Dorsal view of puparium x 7.5 ; showing shape, markings, and at 

 A, the posterior, larval, respiratory organ. 



7 -Dorsal view of adult c?, x 7.5. 



