Plate XXVI. 



(To be bound facing Plate XXVI.) 



Comparison of larval hairs of Celastrina argiolus in third and fourth 



INSTARS. 



Fig. 1. — Hairs of larva in penultimate stage (cast skin at 3rd moult) x 150. 



Two large subprimary hairs (representing i and ii) are very noticeable, also 

 many secondary ones (scimitar and dagger hairs). The hairs and bases are 

 actually, not merely comparatively, larger than in final skin (fig. 2, also pi. XXV., 

 fig. 2). The rays of the hair-bases are more slender than in last stadium, but 

 comparatively thick towards, and rounded at, the ends. The hairs are contracted 

 towards the base, and are fusiform rather than tapering as in last instar ; especially 

 they are remarkably curved, and have the spicules very marked on, and often con- 

 fined to, the convex margin, giving the "hacked scimitar" outline. Several 

 lenticles with coronate margins also represented. 



Fig. 2. — Portion of larval skin in final instar x 150 (see also pi. xxv., fig. 2). 



Taken from the middle of a segment (with no subprimary hairs) (see pi. XXV., 

 fig. 2). The ordinary hairs are shorter than in the preceding instar (see fig. 1), 

 straight and tapering, no " scimitar " and " dagger " hairs ; the hair-bases with 

 short conical rays. 



