bee Ginke 
VOL. XxXI. AUGUST, 1914. No. 4 
HYBRID BUTTERFLIES OF THE GENUS BASILARCHIA. 
By W. L. W. Fiexp, 
Milton, Massachusetts. 
On August 19, 1910, at Alstead Center, New Hampshire, 
several females of Basilarchia archippus, reared in captivity, were 
placed in a breeding-cage with males of B. arthemis captured in 
the neighborhood. The butterflies were fed with dilute honey 
applied to heads of Prunella and clover. 
On August 20, a pair was found in copulation, remaining in 
that state for about half an hour. Afterward the female was 
removed from the cage and placed on willow shoots out-of-doors, 
under a cheese-cloth covering. Every leaf of the willow had been 
inspected; a wooden baseboard was provided, and all crevices were 
tightly packed with cotton. The butterfly was a crippled one, 
and found difficulty in balancing herself upon the leaves. Some 
of her eggs were laid upon leaves in the normal way, a few on 
stems, and many on the cheese-cloth in the vicinity of the foliage. 
In seven days she laid sixty-two eggs, and then died. 
The larve began hatching nine days after the beginning of 
oviposition, but in all only nineteen appeared; and it was noted 
that none of these came from eggs laid toward the end of the period 
of oviposition. 
The larve grew slowly, but were favored by unusually mild 
weather, and began to construct hibernacula early in October. 
On October 21, sixteen were found hibernating; the others had 
disappeared. The hibernating larvee were transferred to a small 
outdoor shelter near my laboratory in Milton, Mass. 
On April 27, 1911, they were placed on willow shoots under a 
cheese-cloth shelter. The willow shoots had been started indoors 
and kept under close scrutiny, and were known to be free from 
other larvee. 
On May 7, the larvee began to issue from their hibernacula. In 
all ten appeared, but one was very belated and weak, and soon 
