91 
kennen". ,,Wie viele hundert Male ich dies auch gesehen habe, 
niemals ist es mir gegliickt dabei an etwas derartiges denken zu 
kånnen; die Schwånzchen z. B. welche dann, laut Poulton, die 
Antennen vorstellen miissten und damit nach seinem Urteil sehr 
stark iibereinstimmten, gleichen denselben in Wirklichkeit absolut 
nicht". In the second edition (p. 145) he again mentions this 
»Phantasiewahrnehmung, deren Unrichtigkeit sich mir jedoch bei 
der Beobachtung vieler Lycæniden mit dergleichen Fliigelanhångseln 
;… Volikommen gezeigt hat. .... Man hat es hier offenbar mit 
einer gewissen Suggestion zu tun.” 
I must say to this statement that either has Piepers not ob- 
served any of those butterflies, where the false head is well devel- 
oped, or he must have laboured under an autosuggestion to the end 
that there must”not be such a thing. Unfortunately he does not 
state which species he has observed, so it is impossible to see 
which alternative is the right. But I am quite convinced that, had 
Piepers observed T'hecla battus or marsyas he would have 
agreed that the ,double head" is a fact. Then he would probably 
also have accepted the observation of Planter!) of a species of 
Deudoryx in Egypt that has "not only a ,double head" like the 
Thecla's but even moves both backwards and forwards. (I have no 
first hand knowledge of this observation). 
One of the first observations of this remarkable character of 
the Thecla's was (according to Poulton) made by Perkins in 
1888, on a species occurring also in our country, viz. Thecla W- 
album (Fig. 19). Knowing this I was very anxious to study this 
Species also. During this summer I had then the satisfaction of 
observing, under the best possible conditions, several specimens of 
this species. The result of my observations was quite unexpected. 
They did not move their hindwings at all, and I did 
not in any way think the hind end of the wings sug- 
8Eestive of head.2). 
This result is both surprising and most interesting. Of course, 
it must have moved its wings, when Perkins made his observ- 
stion, otherwise he could hardly have come to the idea that the 
ej dm Reviik scientifique (Revue Rose) 13. Septbr. 1903. 
2) It is worth mentioning that one of the specimens I observed had lost 
the hindpart of its hindwings. 
