BY H. J. TILL YARD. 



645 



(1 ) The humeral veinlet, hm, is supplied by a special trachea 

 which rises with 8c and runs alongside it for some distance. 

 This might be the remnant of the old costal trachea, but is more 

 likely to be a true basal branch of Se. In any case, it should 

 be noted that the condition seen here in the pupal wing is closely 

 paralleled in the fossil genus Aristopsyche of the Order Para- 

 trichoptera (Text-fig. 65). It is also to be found in the pupae 

 of the Cossidae (Text-figs. 85, 86). 



(2) In the forewing, trachea 2 A is short and tends to bend up 

 towards 1A, thus indicating a tendency towards the formation of 

 the single anal Y-vein found in most Lepidoptera. 



(3) In the forewing the anal group of trachea? arises differ- 

 ently from that of Charagia, the individual members being more 

 widely separated. They are all. however, far removed from Cu, 

 which is close up to M. In the hindwing, the anal group is 

 much the same as in Charagia. 



As before. I have marked by double dotted lines the positions 



Text-Fig. 81. 

 Leto staceyi Scott, iniaginal venation (x 0-8). Lettering as on p. 535 



