106 THE KNTOMOLOGIST's RECORD. 



The only example in the literature in which heterochroism was 

 noticed in the larva, pupa, and imago, is the one described by Oertel 

 in CItaerocampa elpenor, L. The larva was dark brown on one side and 

 bright green on the other, and the pupa and imago were dark (dunkel) 

 on one side and light (hell) on the other. The division was sharp and 

 down the middle line. Unfortunately the sex is not mentioned. 

 {Interu. Knt. ZeiUchr. Guben, 1910-1911, iv., pp. 48 and 49.) 



In the case of imagines a good many examples have been recorded, 

 and in some of these it is known that the colour of one side is a Men- 

 delian dominant to that of the other. The following list gives all the 

 examples I can collect, and since most of them are indexed as aberra- 

 tions the references may be useful. 



Psiliira iixmacha, L., female. Left side typical, right side ab. 

 eremita, O. Thorax and abdomen halved. Bad Elmen, Magdeburg. 

 {Bed. Ent. Zeitschr, 1911, hi., p. (29).) 



Ptiilnia }iio»acha, L., female. Left side typical, right side ab. 

 eremita. Thorax and abdomen quite black except for a white shoulder 

 tuft on the left side. Left antenna thicker. (Htichel., Zeitschr. /'. 

 Wiss. Insektbiol, 1912, viii., p. 41, fig.) 



Atilia tan, L., female. Left side typical, right side var. liKjens, 

 Stndfs. Thorax and abdomen half typical, half melanic. Bred by 

 Hartmann, 18S7. {Bed. Ent. Zeits^chr., 1888, xxxii., p. 239.) 



The melanic forms of these species are Mendelian dominants. 



Culias croceiis, Fourcr. {ediiso, F.), female. Right side ab. helice, 

 Hbn., left side typical. {F'ntoiiiohmnt, 1878, p. 49, coloured plate.) 



Colias croceiis, Fourcr. {eiltisa, F.), female. Right side typical, left ab. 

 helice, Hbn. Mrs. Hemming. Shown at the South Lond. Ent. and N. 

 H. Soc. {PrncecL, 1912-13, p. 126.) 



Colias philodice, Godart, female. Left side typical, right side the 

 white form but smaller and misshapen. {I'si/clw, 1904, ii., p. 118, 

 plate X.) 



Dryas jioji/iia, L., female. Right side typical, left side ab. valesina, 

 Esp. ".). A. Clark coll. {Ent. Becord, 1910, xxii., p. 20.) A doubtful 

 example. 



C. criiceiis and ab. /wlice, and Dri/as pap/iia and ab. rolesiiia, breed on 

 Mendelian lines, the aberrational forms being dominants. 



Mimas tilia:, L., female. Sharply divided into two colours down the 

 middle line of the head, thoi'ax and abdomen, the right side being of the 

 green colour of the type, the left the red-brown of ab. briinnea, Bartel. 

 Soc. Knt., Zurich, 1895-1896, x., no. 23, p. 182.) 



The brown ab. brimnea, is a simple Mendelian recessive to the green 

 form. 



Seven females and two males of M. tiliae have been recorded with 

 the forewings differing on the two sides, the spotless form, var. centri- 

 pnncta, Clark, var. costipnncta, Clark, var. transrersa, Tutt, and the 

 typical form being represented. I have seen two of these, a male and 

 a female, which are clearly examples of pathological asymmetry, prob- 

 ably due to injury. The others were most likely produced in the same 

 way. {Knt. Mitt., 1917, vi., p. 199; Jllnstr. Zeitschr. f. Knt., 1900, 

 v., p. 72 ; i'roc. Sonth Land. Ent. and ^'. Id. Soc, 1912, p. 80.) 



Theretra porcellns, L. Sex not mentioned. Right side of the 

 normal southern coloration, left side of the unicolorous yellow shade 

 often seen in northern specimens. (G. C. Hodgson, Ent. Becord, 1907, 

 xix., p. 248, and Tram. City of Lond. Knt. Soc, 1907, p. 9.) 



