98 CLAUDE FULLER. 



Fig. 130. — Fore ; abnormal ; M. furcate ; Cu. crossing branches of 

 M. and fusing with R. 



Fig. 131. — Hind; abnormal; probably owing to a duplication of 

 trachea Cu.. the extra trachea becoming associated with M. ; or, pos- 

 sibly, to a duplication of trachea M. and a high development causing a 

 reduction of Cu. 



Fig. 133. — Fore ; abnormal; itf. duplicated, both stems reduced and 

 fused to B. 



Fig. 134.— Fore ; abnormal ; M. unusually developed. 



PLATE IX. 



Cryptotermes, sp. 

 Wings and wing-sac trachea?. 



Figs. 135a and b. — Wiiig-stump and base of lamina ; fig. 135a, fore 

 wing ; fig. 135b, hind wing. 



Fig. 136. — Wing-sac of very young nymph, presenting three principal 

 tracheae (R., M., Cu.), which are more or less straight and parallel. 



Fig. 137. — ^ Wing-sacs of young nymj)h, more advanced than that illus- 

 trated by fig. 136, presenting five principal trachese (P. sc, C, 8c., B., 

 M., Cu.). 



Fig. 138. — Wing-sacs of young nymph, more advanced than that 

 illustrated by fig. 137, illustrating the development of ofiisets from B. 

 and Cu. and the delayed development of the anal. 



Figs. 139a to g. — Diagrams illustrating some of the varied develop 

 nients of the medial. A, common form ; B, medial entwining radial ; 

 c, medial departing from radial after becoming applied to it ; D, medial 

 with a straight, sector-like branch ; E, medial with a sinuate sector ; 

 F, medial with a reduced sector; G, sector of medial with two fine 

 branches. 



Fig. 140. — Dorsal aspect of cardinal and bases of trachese of wing-sac. 



Fig. 141. — Wing-sac of a fully-grown nymph with full complement of 

 trachea;. 



Fig. 142.— Apex of wing-sac of a fully-grown nymph, illustrating 

 (1) how the princij)als extend ; (2) how the offsets of the cu])ital dicho- 

 tomise and recurve into the field of the wing-sac. 



PLATE X. 



Cryptotermes, sp. 

 Fig. 143. — Normal fore wing ; M. with sector-like brancli to apex, 

 with cross-branches between M. and R. and between 31. and Cu. 



