160 Transactions. 
First Inter-anal Cross-vein (ia,).—All the species have this cross-vein, 
except demissa, barbarica, rosicoma, and zonodoxa. Its absence is accom- 
panied by a weakening of the anal veins. 
Anal Veins (1A, 2A, and 3A).—The arrangement of the anal veins is 
very peculiar, and varies little throughout the genus. At about two- 
thirds of its length 2A curves sharply upwards and joins 1A, 3A following 
a similar course in relation to 2A. In one species, however, tanthina 
(fig. 9), 2A does not join 1A or curve towards it. In calliarcha (fig. 10) 
2A bends towards 1A at ia, and from thence sharply downwards again, 
thus giving an unusual appearance to what is essentially the same structure. 
In some of the species the anal veins are very weakly chitinized, and can 
only be traced with difficulty. 
The Hindwing. 
Subcostal Vein (Sc).—Sc forks into Sc, and Sc, in all of the species. 
In a few of the forms an interesting feature is present in connection wit 
to rf, and the vein is of double width for some distance basad of this. 
lucilia the double nature of the vein is obscure near the normal forking, 
in the length of the stalk i i 
2 , particularly in regard to R, and 
dorowena (fig. 11) R, and R, are connate ; in aurella and ianthina they are 
