62 CLAUDE FULLER. 



The radius has both outer and inner bi-anches. The outer 

 branches, or offsets, ordinarily connect with the costa ; but 

 one or two, near the apex, tend to extend towards the wing- 

 tip, taking a more or less parallel course with and between 

 radius and costa. The number of offsets is variable, 3 to 6, 

 and any one may be simple or subdivided. The inner 

 branches, or sectors, are variously developed, the more basal 

 being frequently atrophied ; when few in number all may 

 reach the inner margin of the wing ; when many, most are 

 atrophied. The sectors may be simple or much subdivided ; 

 the subdivisions may anastomose among themselves or with 

 the pseudo-media. The sectors present in a wing range in 

 number from 3 to 6, of which 2 to 5 may reach the wing- 

 margin. 



The pseudo-media is, exceptionally, simple, fig. 84a (PI. VII), 

 usually it is deeply furcate ; when furcate its two main 

 branches may be simple or subdivided. Its subdivisions 

 may extend to the margin at 1 to 4 points. In some cases 

 the subdivisions are anastomosed to the radius sectors and 

 cubitus, fig. 84c, and occasionally are so absorbed that the 

 pseudo-media may appear as not extending to the wing 

 margin . 



The cubitus exhibits a variable number of offsets, 8 to 12, 

 which are either simple, furcate, or more subdivided. 



The anal of the hind wing is extensive when compared with 

 the trachea it succeeds, and almost invariably fuses with the 

 basal offsets of the cubitus, figs. 70b (PI. VI), and 84b, c, l> 

 (PI. VII). 



The wings of other local representatives of the genus have 

 similar diversities. Larger wings differ only iu that the 

 post-costa displays stronger and more numerous branches, 

 fig. 70a (PI. VI), and the sub-costa is more frequently branched. 



Analysis of ten wings of H. viator : 



Post-costa : Simple, 7 ; with one branch, 2 ; with two 

 branches, 1. 



Sub-costa : Simple, 2 ; with one branch, 6 ; with two 

 branches, 2. 



