E. A. Cockayne 83 



gynandroinoiphs not only exist in the halved and nearly halved forms, 

 but also in the crossed and coarse mosaic forms. For this segregation 

 of distinct colours and patterns, which are quite unconnected with sex, 

 I use the term heterochroism. 



Exam])les recorded in Schultz's lists, which mi'roly record paiacarctic 

 gynandronuir[)hs, with additions from recent literature and a few hitherto 

 unrecorded examples are appended below. 



(1) Aglia tau and ab. lugens (iiigerrima). 



Several of these are known : in some the male portions were type 

 form and the female ab. lugens, in others the reverse occurred. They 

 were completel}' halved or crossed, and in one a single hindwing showed 

 female shape with the colouring of ab. lugens. 



The antennae were intermediate between the male and female in 

 the ones showing a coarse mosaic. Gynandromorphs with both sides 

 typical or both melanic are known. 



(2) Psilura inonachu. 



(a) Upper side of left forewing female with type colouring, the 

 rest, including both antennae, and the abdomen male, with the black 

 colour of the aberration eremita. 



(h) Halved ; left side female type colour, right side male ab. eremita 

 except for a small patch in hindwing. 



(c) Halved ; left side male typical, right side female eremita, the 

 division extending down the centre of the thorax and abdomen. 



In this species also halved gynandromorphs wholly typical and 

 wholly ab. eremita are known. 



(3) Hemerophila (Sgnopsia) abruptaria. (Previously unrecorded.) 



(a) Halved ; left side female type (buff colour), right side male ab. 

 brunneata Tutt (chocolate colour). Abdomen thin and wholly typical. 

 External genitalia of (?) both sexes. (PI. XXI, fig. 1.) 



{h) Left side female type except for a melanic area on hindwing 

 on upper side, and another on forewing on under side ; right side 

 ab. brunneata. Abdomen thin. 



(c) Left side male type, right side female ab. brunneata. Abdomen 

 stout, half melanic, half typical. 



(rf) Left side female type, right side male ab. brunneata. 



Gynandroniiir))hs are known with botli halves typical. 



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