Plate XXIV. 



(To be hound facing Plate XXIV.) 



Skin or larva of CeiiAktrina argiolus (second instar) x 60. 



This shows the first stage of the transition from the few (nearly all primary) 

 hairs of the first instar (pi. xxiii) to the dense, and but slightly differentiated, 

 coating of the last skin. The large dorsal hairs of tubercle i are still distinct, one 

 to each segment (except mesothorax); which hair represents tubercle ii may be 

 doubtful amongst the several large hairs on the dorsal flanges ; the three lateral 

 hairs (belonging to tubercles iv and v) are accompanied by several others, whilst 

 in the space between are numerous short hairs and lenticles ; of the latter, one or 

 two above the spiracles may represent the very definitely placed pair of the first 

 instar (pi. xxiii). The legs (below to the left of fig.) and the prolegs (above to the 

 right of fifi.) are seen (the head is just outside the plate), but are not clear enough 

 in the reproduction to do more than indicate the segments. For detailed descrip- 

 tion see pp. 438 et seq. 



