( xli ) 



" The young larvae were at first sleeved out on a sallow- 

 bush, each brood being kept separate, and properly registered. 

 In numerical strength they were about equal at this time. 

 On the approach of winter, two of the broods, b, c, were 

 removed from the sallow-bush, and confined in breeding-cages, 

 at the bottom of which plenty of dead leaves and twigs had 

 been placed. Other twigs were cut from the sallow-bush at 

 intervals throughout the winter, and, together with twigs of 

 Jasmine nucUflora, placed in the water-holder in each cage. 

 Although the larvae occasionally nibbled the bark of each 

 plant, they did not thrive well, but, on the contrary, gradually 

 dwindled and died, for on examining the cages early in March 

 it was found that only sixteen individuals of brood b and 

 three of brood c had survived. The decrease in number of 

 larvae had been previously noticed, but it was supposed that 

 they had simply retired between the leaves at the bottom of 

 their cages. Enumeration of the survivors of brood a, which 

 had been kept on the sallow during the whole winter, and 

 were consequently exposed to all weathers, showed a total of 

 fifty-six healthy larv®. The remnants of broods b, c, were 

 again sleeved out, and, as the sequel will show, did very well. 



" All the larvse, when nearly full-grown, were changed from 

 the sallow bush into breeding-cages, in which was earth 

 covered with about an inch of moss. The moths commenced 

 to emerge on June 14th, and continued to do so until July 8th, 

 on which date the last specimen, a male of brood b, closed 

 the list. 



Analysis of the broods a, b, c. 



"A. 2 destrigaria, Y&v. x ^ conversaria, — Fifty-six larvae 

 produced the same number of imagines, of which eleven males 

 and twelve females are more or less like the female parent, 

 while thirteen males and twenty females are of the male 

 parent form. 



" b. 5 conversaria x ^ conversaria. — Sixteen larvae pro- 

 c'uced fifteen imagines, nine males and four females being of 

 the parent form, and one specimen of each sex more or less 

 typical in character. 



" c. ? conversaria X ^conversaria. — Three larv» produced 

 t'»70 imagines of the parent form. 



PROG. ENT. SOC. LOND., UI., 1889. G 



