MISCELLANEOUS 



57 



Moths appeared with sport wing patterns; also strongly melanic 

 forms ; also flying moths ; also moths with rudimentary wings. 



A great deal of work has been done in mating these sports and 

 freaks, making rearings and following up the appearances for several 

 generations, but for the most part only results of little value were 

 got. In the matter of the moricaud or melanic larvae more important 

 data were obtained, especially by Miss McCracken. Some of the notes 

 and results of the work with the other sports may be briefly referred 

 to as follows: 



Cocoonless and skeleton cocoon pupce. — Rearings were made in 

 1905 from matings of sport individuals appearing in the general lots 

 of 1904, and in 1906 from the 1905 moths produced from the 1904 

 matings. If there were no reappearance of the cocoonless character 

 in the first hybrid generation (from a cocoonless and cocooning mating) 

 it would not necessarily indicate the non-heritable character of the 

 cocoonless habit but might show it to be a strictly recessive Mendelian 

 character. The 1906 rearings from inbred hybrids should however 

 reveal the recessive character again. 



From seven rearings in 1905 from 1904 matings in each of which 

 one or both parents were cocoonless, and seven rearings in 1906 

 from inbred matings from the 1905 generation the data show no 

 transmission of the cocoonless character. It is ontogenetic. 



Miscellaneous larval coloration sports. — From strongly pinkish, 

 bluish and "black-face" larvse descendants were obtained (the sports 

 being crossbred with normal larvae of their same race) without obtain- 

 ing in either first or second generation (inbred hybrids) any 

 reappearance of the sporting shades of color. 



An interesting coloration sport which I have called "clouded head" 

 (PI. Ill, fig. 10) was noted in a lot of Bagdad race worms in 1906. 

 Nearly one-half of a single lot of larvae (a lot being the worms derived 

 from all the eggs laid by a single female) showed in greater or less 

 degree a "clouded head," a coloration of the dorsum of the thorax much 

 like that of the familiar moricaud larval sport, but with the color pattern 

 strictly limited to the dorsum of the thoracic segments. Four pure 

 matings (i. e., "clouded head" with "clouded head") from this lot were 

 made and the 1907 rearings from these were as follows : 



(No. 230) More than 50 per cent, of the larvae with clouded heads. 



(No. 337) Eighty-nine clouded heads, forty-nine normals. 



(No. 370) Twenty-two clouded heads, one hundred and fourteen 

 normals. 



