301 
indicate, perhaps, affinities with the Chrysomelid, and are evidently 
of advantage in aiding the young creature in the work it has to do. 
This stage is very evanescent, as the necessity for locomotive organs is 
transitory. Immediately after finding the proper spot for entering the 
bean, the larva gnaws its way in and molts. 
Fic. 43.—a, First larva of Bruchus fabe greatly enlarged; b, thoracic processes; ¢, head from front; 
d, same from side; e, antenna; f, thoracic leg; g, rear view of tarsus; h, same, front view, still more 
enlarged (original). 
Other eggs hatched on February 10, and February 17, and on Febru- 
ary 21 a small discolored spot was discovered on one of the beans, and 
underneath the skin was found one of the young larve. After enter- 
ing the bean it had cast a skin, which was found in the burrow. After 
this molt the larva had lost its legs and become stout, acquiring the 
normal characters of its later stages. One bean which was carefully 
examined contained 17 larve, 8 of which were nearly full-grown, while 
9, which had entered the bean later, were in different stages of devel- 
opment. On January 28 a single impregnated female was confined 
with several beans in order to ascertain the number of eggs laid by 
a single individual. From January 31 to February 25, 68 were de- 
posited, when the female died. Careful experiments with isolated indi- 
viduals were conducted in order to ascertain the exact length of a single 
generation, with the result that sixty-six days was found to be the av- 
erage time from the deposition of the eggs to the issuing of the adults. 
The larva before transforming frequently makes two possible points 
of future exit, one at each end of its burrow, and occasionally the whole 
outer surface of the burrow remains covered simply by the thin outside 
skin of the bean. 
The remark which we have just made regarding the germination of 
weeviled peas, will apply equally well to beans damaged by Bruchus. 
