1154 
Of any interrelationship between patterns there could be no question, 
even within the limits of the same family: “Even where the nerv- 
ural system is the same, we find either a striation of the transverse 
nervures or of the longitudinal ones, either a colouration of the 
wing-root or of the tip. Therefore it would be a mistake to try to 
arrange the patterns even of one family into one single evolutionary 
series.” 
On p. 70 pe Meyerm remarks: “In the group of Trypetines we 
meet with a number of patterns, which cannot be brought into 
connection with each other.” 
It follows from my remarks in the foregoing paper, that I have 
come to the opposite conclusion. 
On p. 63 pre Meyere calls attention to the fact that: “the broad- 
winged Trypetine fly Platensina ampla carries some spots which differ 
from the common hyaline ones in their hue, which seen under a 
certain angle is dead-brown.” The difference, according to his view, 
is only due to a lighter staining of the chitinous layer and of the 
hairs arising from it. 
By the kindness of my colleague pr Meyere [ was able to in- 
vestigate a specimen of this fly, and was in the first place impressed 
by the fact, that these apparently dead spots did not occur over 
the whole wing-surface, but left the margins free, where, in the 
usual places also occupied in other fly-species, hyaline spots occurred 
at regular distances from each other. It furthermore awakened my 
curiosity, that these central spots, though evidently dead, i.e. not- 
diaphanous, did not show a brown, but on the contrary a light blue 
shade, and were slightly lustrous. Noting their position in relation 
to the hyaline, it became evident, that a bluish spot was situated 
in the prolongation of each hyaline marginal spot, with the excep- 
tion of the fifth (adjoining the extremity of the subcostal vein), 
which was distinguished from the more distal marginal spots by 
greater length (in a transverse direction) and by a constriction in 
the middle. This difference might be also expressed by saying that 
the fifth spot bears a bead-like appendix, by which it extends farther 
“towards the centre of the wing than its companions. It is this 
appendix which occupies the same position in relation to the peri- 
pheral part of the spot, as the blue spots do to the remaining 
hyaline spots. And furthermore these blue spots occur in exactly the 
same positions, where in other Trypetines hyaline ones are seen. 
1 therefore came to the conclusion, that the blue spots are nothing 
but vanishing hyaline ones, which become obliterated by penetration 
of the ground colour. Their occurrence is in my -opinion a proof for 
