56 BULLETIN 1869, U. 8. DEPARTMENT OF AGRICULTURE 
prior to the molt their details of structure are well defined beneath 
the skin of the fourth stage (fig. 6, 7). As in the preceding molt, 
the rupture in the integument seems to be irregular and does not 
Fig, 26.—Under side of hide just removed, showing cysts, some of which are cut open 
to expose cattle grubs 
always occur in the same place. The exuvium remains in the cysts 
and can often be removed by continued pressure after the fifth-stage 
grub has been forced out. 
