72 THE ENTOMOLOaiST. 



GYNANDROUS EXAMPLES OF AMPHIDASYS BETULARIA. 



Mr. Albert Harrison has been good enough to entrust to 

 me six of the seven gynandrous A. betularia that he bred from a 

 batch of ova obtained from a female specimen taken in the New 

 Forest in June, 1900 (Entom. xxxiv. 203, 349). These specimens 

 have been submitted to Sir George F. Hampson for examination. 

 As it was not permissible to mutilate the insects in any way, 

 attention has necessarily been confined to the secondary sexual 

 characters, and the results of his examination have been tabulated 

 by Sir George as follows : — 



No. 1. Right side 3' antenna, frenulum, and retinaculum. Left 



side ? antenna, frenulum, and retinaculum. 

 No. 2. Right side ^ antenna, frenulum, and retinaculum. Left 



side 5 anteuna, frenulum, and retinaculum. 

 No. 3. Right side antenna uuipectiuate, ? frenulum, ^ retinaculum. 



Left side ^ antenna, ? frenulum, g retinaculum. 

 No. 4. Right side <y antenna, ? frenulum and retinaculum. Left 



side ? antenna, ? frenulum and retinaculum. 

 No. 5. Right side ^ antenna, S' frenulum and retinaculum. Left 



side $ antenna, ? frenulum and retinaculum. 

 No. 6. Right side ? antenna, <? frenulum and retinaculum. Left 



side 3 antenna, ^ frenulum and retinaculum. 



From this table we see that, as regards external organs, 

 Nos. 1, 2, and 5 are each male on the right side and female on 

 the left side. I find that the wings themselves also exhibit the 

 same sexual differences, and if one may judge from the appear- 

 ance of the anal segments of the body it would seem that these 

 are also " half and half." 



No. 4 appears to be a female in all respects except that it 

 has a male antenna on the right side. 



No. 3 has the wings on each side of equal size. There is a 

 well-formed male antenna on the left side, but the right antenna 

 is that proper to the female with some short pectinations along 

 its lower side, an abnormal position. 



Except that it has a female antenna on the right side. No. 6 

 appears to be a male specimen, and comes nearest to being a 

 counterpart of either Nos. 1, 2, or 5. It is not, however, the 

 exact reverse of either, because the frenulum and retinaculum 

 on the right side are male in character. 



Richard South. 



