Y. TAXAKA. 



170 



flio ciuhtl. muscle; first day of fifth ago, nu.giiified. 177/, JX, .Vindicate tlie eightli, 



uintli and tentli segment respectively. 

 Fig. a. Distal end of tlie silk gland in a full grown larva. Lcit;; .'i x ?>. 

 Fig. U. Di.tal end of the silk gland an! the nuis.l, . rc.nm.ct..d ^^ ith it, li,.t dav of f.ftl. 



age. Jx'itz 3x3. 



Fig. liK Diauniniatic view of the posterior part of the ■^ilk ixland, -li(.winii- structures 



Fig. 12. Ti.H-h<al tulx- Nvith th(>ir termini, fifth day of first age. Leitz 3x7. 



Fig. 11. Tips <,i' trachea in tlie moment coming in contact with the silk ghmd, seventh 



<!ay of first a-e. Lcit/ 3x7. 

 Fig. 11. V |.an ol' the < .-n..-., ction throii-h the middle di\ i.ion, fu-t day of fourth age. 



Fig. 1.:. Cro <(tion through the middl<> divi.sion, in first das of fifth age, bivohin, shoAV- 



ing ghuulular cells which are richly distributed with tracheal tubes. Zei&^ IxE 



Fig. IV. A part of the cross-sc-ction th.ough the middle division, during the fourth 

 moult, sliowing the double rings of lienidia; bivoltin. Zeiss 4 k E. 



Fig. IT. Kxtnmitics of trach(>a ending freely in tiie (xdl bodies. Zei.ss eompcn.sat. ocul. 



7Yr,^c TT. 



