455 
On the underside however (which is never represented even in 
large illustrated works) we again meet with the same feature, as 
mentioned just now for pavonia, spini and pyri, viz. that the 
course of the transversal bars is far more regular and original than 
on the upperside, this bringing about a much greater similarity 
between fore- and hindwing on the first mentioned surface. 
I want to draw your attention to a simple dark transverse stripe 
on the middle of both wing-pairs, almost devoid of incurvations and 
rather faint. On the forewings this stripe runs along the distal border 
of the eye-spot, on the hindwings along the proximal one. Regard- 
less of this difference, I think we have to deal in both eases with 
vestiges of bar IV. To this assumption I am especially led by the 
comparison of the upperside. On that of the forewing the anterior 
part of this bar is quite apparent up to the eye-spot, which constitutes a 
marked difference between boisduvalii and the three first-mentioned 
species. Past the eye-spot however the posterior part of the bar is 
wanting, but from the postero-interior border of that spot a black 
stripe runs across to Bar VI, turning sharply at an angle in the 
middle of its course and then running parallel to Bar VI, perpen- 
dicularly to the posterior wing-border and as far as this latter. The 
lastnamed part belongs to Bar V, as is proved by its comparison 
with the upperside of the hindwing, on which the Bars IV, V and VI 
may be perceived in their full extension, though faint and half- 
hidden under the hairy coating. 
On the underside of boisduvalii therefore the dark submarginal 
border of both wing-pairs is located between Bars II and III; on 
the upperside however this is only the case on the hindwing. Bar 
Ill may even remain separated from the dark seam as an independ- 
ent isolated stripe, as is shown in the illustrations of Srirz (Vol. II 
Pl. 31%, in contrast with the specimen at my disposition, where the 
black internal border was not free from the much broader margi- 
nal seam. 
In some respects Saturnia (Neoris Moore) scheneckii 
corresponds with boisduvalii, e.g. in the presence on its under- 
side of an extremely faint yet complete transversal stripe, which takes 
its course along the eye-spots. In this species however no difference 
exists as to the situation of this stripe on fore- and on hindwing, 
while the stripe is also present on the upper-side, though in an 
incomplete and unequal way. 
Bar V is here the most pronounced and regular, VI and VII are 
hardly visible. 
The eye-spots have been removed outward, and in consequence 
