ZEjP/DOPTERA. 
341 
wings and sometimes a faint double bar at the end of the 
discal ceil. The head is small; the antennae are pectinated 
broadly in both sexes; and the ocelli, palpi, and maxillae 
are wanting. The abdomen and thorax are densely clothed 
with woolly hair. The distinctive feature in the venation of 
the wings (Fig. 419) is the obvious presence of vein I on the 
hind wings. 
The usual food of the Silk-worm is the leaf of the mul¬ 
berry. Our native species, however, are not suitable. The 
species that are 
most used are the 
white mulberry 
(Morns alba), of 
which there are 
several varieties, 
and the black mul¬ 
berry (Morns ni¬ 
gra ); the former is 
the better. The 
leaves of osage 
orange (Maclura 
aurantiaca) have 
also been used as 
silk-worm food to 
a considerable ex¬ 
tent. In case silk¬ 
worms hatch in the 
springbefore either 
mulberry or osage- 
orange leaves can 
be obtained, they 
may be quite sue- Fig. 419.—Wings of Bombyx tnort. 
cessfully fed, for a few days, upon lettuce-leaves. 
The newly-hatched larva is black or dark gray, and is 
covered with iong stiff hairs, which spring from pale-colored 
tubercles. The hairs and tubercles are not noticeable after 
