PROF. J. O. WESTWOOD ON THE URANIIDZ. 517 
Lep. pl. A. fig. 3), the only difference being that in that figure we have all the five 
branches and the postcostal vein. In that work these two branches are rightly regarded 
as the two discoidal branches, whilst in Attacus, as in Morpho, we only find three clearly 
defined branches of the median vein, ¢ 1, ¢ 2, ¢ 3. 
In Attacus pavonia minor (Plate LXX XVI. fig. 11) we have the same small number 
of branches in the fore wing as in A. atlas, with the exception that the first branch 
of the postcostal vein (s') is so very short and slender as to be scarcely visible, arising 
nearly at the tip of the wing and almost immediately joining the costa; the difficulty 
as to the two discoidal branches (B4 =? B5* and B5 = 2 3x) is the same as in A. atlas. 
In Aglaia tau (fig. 14) the same arrangement of the veins of the fore wings exists as in 
A. atlas. In the large long-tailed Bombycide (Actias luna &c., Plate LXKX XVI. fig. 15, 
fore wing, fig. 16, hind wing) we have the same arrangement of the median and two 
supposed discoidal veins ; but the postcostal vein has an extra fourth branch ; the first 
(6 1) arises at about three fourths of the length of the costal margin, and extends to 
its five-sixth portion, whilst the second branch (6 2) is exceedingly short and close to 
the tip of the wing, just as in Pavonia minor; the third branch extends (6 3) to the 
tip of the wing, and is followed by a long branch (4 4), which agrees equally with the 
branch (4 3) in Pavonia minor; the fifth postcostal branch is wanting, whilst the two 
discoidal ones (45* and ¢3+) arise from a very short basal vein near the extremity of 
the discoidal cell. In the tailed hind wings of this group (by which they are rendered 
to a certain degree analogous to some of the Uraniide) the three branches of the me- 
dian vein (¢ 1, ¢ 2,¢ 3) run to the extremity of the long tail. Such is also the case with 
the remarkable Phalena brachyura of Cramer, from tropical Africa, whilst in Hudemonia 
semiramis (Plate LXXXVI. fig. 13) the long tail is strengthened by the third subcostal 
branch as well as the second and short third median branches. (In the Uraniideous 
genera Manidia and Coronidia the tail of the hind wings is strengthened by two of the 
branches of the median vein, whilst in Uranidia leilus it bears only the third median 
branch. ) 
In Saturnia certhia, Fabr., we find a deficiency in one of the branches of the post- 
costal vein, the first branch arising at about three fourths of the length of the wing, the 
second branch extending to the tip, the third and fourth arising at about the middle 
of the wing at some distance beyond the discoidal cell, whilst the two discoidal branches, 
as well as the third branch of the median veins, arise from the transverse extremity of 
the discoidal cell. 
In Endromis versicolor (Plate LXXXVI. fig. 12) we find the full complement of 
veins and branches in the fore wings; and here the two discoidal branches are so placed 
as completely to prove (as it seems to me) that the upper one (B5*) is a portion of the 
postcostal series, and that the lower one (c3*) is a portion of the median series, The 
discoidal cell is here closed by a much curved discocellular vein, emitting two veinlets 
running towards the base of the wing within the cell, which might be assumed to be 
VoL. X.—PaRT x1. No. 3.—June 1st, 1879. 4¢ 
