516 PROF. J. 0. WESTWOOD ON THE URANIIDA, 
The fact that Godart, in the ‘ Encyclopédie méthodique, described a species of Coro- 
nidia as an Agarista, that Latreille placed the two genera in juxtaposition, and that 
M. Boisduval had united the three genera named by him Urania (Chrystridia), Cydimon 
(Uranidia), and Nyctalemon (Alcidia and Lyssidia) as three of the tribes of his family 
Agaristidées in his ‘ Monographie des Agaristidées,’ render it necessary to inquire 
how far this relationship is real. It is true that the shape of the antenne in Uranidia 
agrees with that of Agarista, and that the armature of the four posterior tibiz is 
similar ; but the arrangement of the wing-veins in the two groups is wholly unlike, as 
may be seen by comparing my figures accompanying the present memoir with that of 
Agarista lindigii given by me in the ‘Transactions of the Linnean Society,’ Ser. 2, Zool. 
vol. i. pl. xxix. fig. 24, which exhibits the small lozenge-shaped cell (occurring also in 
Othria augias, tab. cit. fig. 18, Hespagarista interjecta, ibid. fig. 22), of which there is 
no trace in Uranidia, where the lower discoidal vein is far removed at its base from the 
terminal portion of the median system of veins. 
A more careful examination than has hitherto been published of the arrangement of 
the veins of the wings in the chief types of the Bombycide discloses the fact, that 
there is more variation amongst them in this respect than is to be met with in other 
great groups, such as the Sphingide, Noctuide, and Geometride, and hence that a 
discrepancy between the veining of the wings of the Uraniide and the Bombycide is 
not a sufficient argument for their rejection from the latter. In the accompanying 
Plate LXXXVI. I have given figures of a few of the leading types of Bombycide, 
commencing with those in which some of the branches of the veins are obsolete, and 
terminating with some which have the full complement of veins and branches. It is 
remarkable that the gigantic types of the Bombycide (Afttacus atlas and its allies), not- 
withstanding the comparatively large size of the wings, should have several branches 
wanting ; and it is not easy to trace the precise analogies of some of those which remain. 
In this species the strong costal vein of the fore wings (a) extends about three fourths 
of the length of the entire costa; the subcostal vein has apparently only three instead of 
five branches ; the first branch (6 1) arises at a short distance before the extremity of the 
discoidal cell, and reaches the costa halfway between the extremity of the costal vein 
and the tip of the wing; the second branch (6 2) of the subcostal arises at a moderate 
distance beyond the cell and reaches the tip of the wing, whilst the main branch (6 3) 
extends to the middle of the rounded hook or apex of the wing. From the underside 
of the subcostal vein, just beyond the branching of the first branch, extends a vein 
obliquely, forming a portion of the anterior margin of the glassy disk, and branching 
into two branches at the middle of this vitreous spot. Are these two branches the 
fourth and fifth branches of the subcostal vein ? or are they the two discoidal branches 
of Mr. E. Doubleday, one of which I have considered as supplemental to the subcostal 
series, and the other to the median series? In their position they exactly correspond 
to the arrangement of the veins in Morpho, as represented by Mr. Doubleday (Gen. D, 
