78 THE ENTOMOLOGIST. 
The hybrids involving Pwcilopsis rachele I owe to my friend, 
Mr. Norman Criddle, of Treesbank, Manitoba, whose efforts to 
get me living females of the species shipped in safety to England 
have been untiring. 
(b) SEConDARY AND OTHER Hyprips. 
(12) Pecilopsis hyb. felkeli = P. hyb. christiane 3 x P. hyb. 
robsoni 2 . 
(13) Pecilopsis hyb. proxima = P. hyb. robsoni 3 x P. hyb. 
christiane @ . 
Both of these hybrids were easily obtained ‘and fairly easily 
reared, the former being the more fertile cross and the latter the 
stronger. 
(14) Pecilopsis hyb. confusa = P. hyb. heslopi 3 x P. hyb. 
christiane °. 
(15) Pecilopsis hyb. mixta = P. hyb. heslopi 3 x Ithysia 
zonaria 2. 
These two crosses are noteworthy, inasmuch as they are the 
first Biston crosses reared containing three species. Another 
noteworthy point is the fact that, although the hybrid @ of 
heslopt was absolutely sterile, on the contrary the male was 
fertile. The latter cross, as is usual when the male is of the 
genus Pecilopsis and the female of the genus Ithysia, produced 
no female. 
(16) Pecilopsis hyb. connexa = P. hyb. christiane g X Ithysia 
zonaria 2. 
The last remark of the preceding paragraph applies to this 
likewise. 
(17) Pacilopsis hyb. laricis = P. hyb. christiane g x P. 
isabelle 2. 
Remarkable as the only hybrid which fed on larch, the food 
of P. isabelle. The others always refused it. 
(18) Pecilopsis hyb. inversa = P. hyb. christiane g X P. 
hyb. marguerite 2. 
(19) Pecilopsis hyb. reversa = P. hyb. marguerite 3 x P. 
hyb. christiane 2. 
(20) Pecilopsis hyb. brooksi = Pecilopsis pomonariw 3 xX 
Lycia hyb. pilzit @ (‘ Lep. Comp.,’ fase. vii). 
Of great importance, as up to the present this cr2ss has 
yielded gynandromorphs only. 
(21) Pecilopsis hyb. hulli = P. hyb. hunti 8 x L. hirtaria 2. 
Produces, in spite of its curious pupe, both sexes. 
(22) Pecilopsis hyb. interfauna = P. hyb. confusa & X P. 
rachele. 
Contains, as will be seen, four species. 
(23) Lycia hyb. burrowsit = L. hyb. pilzii ¢ x L. hivtaria 2. 
Produces both sexes in equal numbers. 
