90 



The Third and Fourth Siacks have no essential clianges to show 

 in comparison with the second. The toothed bristles are always pres- 

 ent, and give to the caterpillar its well-known hairy aspect. 



The Fifth Stage has not been under my inspection; but it does 

 not seem to differ from the preceding ones, so far at least as we may 

 judge from the figvu'es given by Mr. Edwards. That author has fig- 

 ured the entire development of the Phaeton caterpillar from life, and 

 with the natural colors, to which I here refer. The magnifying power 

 used by Mr. Edwards is not adequate to the determination of the 

 characteristic form of the bristles. 



Melitaea Marcia. First Stack (fig. 28). One dorsal row, two 

 sub-dorsal, two supra-stigmal and two infra-stigmal rows of single bris- 

 tles can be seen on the young larva. The bristles are very long, some- 

 what curved and finely toothed. 



SecOxND Stage. On the si)ots where, before the first moult, the 

 single bristles had stood, high warts have now been formed, which are 

 covered with numerous bristles. The greater part of these bristles 

 resemble those of the preceding stage, but on the warts standing in the 

 sul)-dorsal row a part f)f the bristles are of different form, being desti- 

 tute of teeth and swollen at the base. 



Third Stage (fig. 29). On the dorsal, the sub-dorsal, and the 

 supra-stigmal rows the toothed brisdes are entirely supplanted by 

 smooth ones swollen at the base, while on the infra-stigmal row only a 

 single bristle appears on each wart. 



Fourth and Fifth Stacjes. We find the same condition also in 

 the last two stages, /. c, the toothed bristles which were at first exclu- 

 sivelv present have now gix'cn place to the second {(Mm with smooth 

 surface and swollen base. 



Melitaea Nycteis. First Sta(;e (fig. 30). The young caterpillar 

 is covered with long, curved, toothed bristles, which are arranged in 

 the usual regular rows. 



Second Stage (fig. 31). After the first moult, in place of the sim- 

 ple bristles, large warts have api^eared beset with numerous bristles. 

 A part of these are toothed as in the first stage, a part swollen at the base. 



The Third Sta(;e I have not been able to examine. 



Fourth Stage (fig. 321. In this stage, /. e.. after the first moult 

 following the hibernation, the bristles are no longer enlarged near the 

 base, but taper uniformly to a point. 



The Fifth and Sixth Stages show no difierences worthy of mention. 



Melitaea Tharos (fig. 33). First Stage. This is the only stage 

 of Tharos that I have observed, and I find that here also the long, 

 slightly-curved, and finely-toothed bristles are present, arranged singly 

 in the usual longitudinal rows. 



