Experiments with Snails, Moths, and Beetles 153 
(345) are produced in the proportion of 3:1. In two cases, how- 
ever, all the offspring (265 in one case, 182 in the other) were 
spotted. If these are paired, they produce only spotted forms. 
Clearly we have to deal here with extracted dominants. 
The results may be briefly summed up as follows: the two 
types of beetle show alternate dominance and recession, the 
spotted character being dominant, the black being recessive. 
By isolation both types may be obtained “pure.” In nature 
both are continually crossing and recrossing, so that the chances 
are that most individuals are impure, but by selection pure 
breeds can be quickly obtained from them. 
Experiments with the Currant Moth 
There is a curious case, reported by Raynor and Doncaster 
for the currant moth (Abraxas grassulariata), in which there is 
a rare variety, A. lacticolor, that had previously been found only 
in the female sex. The variety is recessive in the first generation 
when crossed with the parent form. The offspring, however 
(F,), produce males, all of which are the ordinary variety grassu- 
lariata, and females, half of which are like the males and the 
other half are var. lacticolor. When, however, a lacticolor fe- 
male is paired with a (F,) male hybrid (L 9 x G (L) @), some of 
the male offspring are lacticolor (and others female). The ex- 
planation of the“transference to the male of the female character 
is not apparent. 
Experimenis with Tephrosia 
A series of hybridizing experiments between the moths 
Tephrosia bistortata and Tephrosia crepuscularia have been 
described by Tutt (based on records by Riding and Bacot). 
These two species are sufficiently similar to have been put to- 
gether as one by some entomologists because occasionally indi- 
viduals have been found that could not be referred with cer- 
tainty to either species, but Tutt describes a number of constant 
differences between the two forms and regards them as distinct. 
Both species have a melanitic variation, that of T. bistortata 
