ONTOGENY 37 
that there are two additional instars, twelve in all. From her account 
we abstract and tabulate the data covering ten points. 

Instars 1 2 3 4 5 6 a 8 9 10 
Days duration 6 6 6 7 Z 7 a 9 11 14 
Ant. joints 4 4 5 5 5 6 7 a 7 7 
Trs. joints i 1 1 1 1 2 2 3 3 3 
Wings 0 0 0 0 r i i i i i 
Lat. abd. app. 0 a ek a He i i i i i 
Lat. sp. of 8 oT O 0 0 r i i i i i 
oo Nemes ie 0 0 r i i i i i i i 
Ment. setae* 0 2 4 |6-7| 8-9/ 10-11/10-11] 12 13 | 14-15 
Lat. setae* 0-1|0-1| 4 5 6 8 8-9 |9-10} 11 | 11-12 
Length (mm.) 1.4/1.8] 2.2)2.813.9| 4.9 7.8 | 8.2 | 1027) 14-0 

* On labium. r, rudiments. 7, increasing in size. 



Fic. 19. Hagenius transforming (drawn by C. H. Kennedy). 
From this it appears that the wing buds and the lateral abdominal 
appendages arrive together at the 5th instar: that the full number of 
