PROF. J. O. WESTWOOD OX THE UEANIID.i:. 517 



Lep. pi. 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 MorjjJio, we only find three clearly 

 defined branches of the median vein, c i, c 2, c 3. 



In Attacvs j^avonia minor (Plate LXXXVI. 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 (b') 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 = ? 35* and 35 = 1 c3») 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 Bombycidse [Actias luna &c., Plate LXXXVI. 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 

 [b 1) arises at about three fourths of the length of the costal margin, and extends to 

 its five-sixth portion, whilst the second branch {b 2) is exceedingly short and close to 

 the tip of the wing, just as in Pawnia minor ; the third branch extends {b 3) to the 

 tip of the wing, and is followed by a long branch {b 4), which agrees equally with the 

 branch {b 3) in Pawnia minor ; the fifth postcostal branch is wanting, whilst the two 

 discoidal ones (bo* and C3*) 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 Uraniidse) the three branches of the me- 

 dian vein (c 1, c 2, <? 3) run to the extremity of the long tail. Such is also the case with 

 the remarkable Phalcena brachyiira of Cramer, from tropical Africa, whilst in Eudcemonia 

 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. — PAKT XII. No. 3. — June 1st, 1879. 4 c 



