342 



Instar V. Duration 10—20 days. Length 23—30 mm. For 

 this stage J made an exception where the drawings are concer- 

 ned. I did now draw the objects themselves imder the microscope 

 with the aid of a camera, biit took the outline of Jacob Hübner's 

 old frontispiee (17GG) and in this entered the different tubercvüa. 

 The changes are not so great as in instar IF. 

 Packard does not describe this stage (see p. 7G). 

 Prothorax. The phimose setae have a length of 5 and 10 mm. 

 ■Biid stand out above the short feathered setae. 

 Mesothorax and MetatJiorax. As in instar IV. 

 Ahdoiuen 1. F. infrastigmaHs has a tuft of bright yellow setae, 

 + 7 mm. long, short plumed, for the rest as in instar IV. 

 Segiii. 2 = 1. V. infrastignmlis is provided with a little group 

 of plumose setae, the length of which is + 7 mm. 

 „ 3 to 7 as in instar IV. 



„ 8. The p. suhdorsaJes have a tuft of setae of different forms. 

 Between the short plumed setae which are more than 7 

 mm. long, we find plumose ones of a length of + 10 

 mm. and long feathered ones, ± 5 mm. long. Further as 

 in instar IV. 

 „ 9. The V. subdorsales are not united and have each a tuft 

 of very long, short plumed setae and some (2 to 4) plu- 

 mose ones, the length of which is 5 mm. 

 The differences between Packard's views and mine foUow 

 here in a short synopsis. 

 Packard. 

 Setae are already spinose in instar I. 



The feathered setae towards the end of instar II on segment 8. 

 The plumed setae in proportion as large as on the full fed 

 Caterpillar in instar III, They appear at the same time on the 

 prothorax and segment 8. 



Whole duration of all the instars as Caterpillar: 23 — 30 days. 

 Three moults. 



SCIIIERBEEK. 



In instar II spiiiose or plumed setae for the first time. 



