32 BULLETIN 329, U. S. DEPARTMENT OF AGRICULTURE. 
In conclusion, there were only two stages found in the ovaries of 
adults killed at the time of capture, either small, round, undeveloped 
eggs in large quantity (stage 1), or round undeveloped eggs with 
the addition of a very few large, fully developed eggs (stage 5). 
This latter stage is presumably the result of a previous engorgement 
and oviposition. 
CONDITION OF THE OVARIES OF NONENGORGED ADULTS TAKEN ON ANIMALS. 
Six specimens, which had evidently just alighted and had not fed 
on that particular animal, were taken at various times from mules' 
ears. They lived from 2 to 47 hours after capture, and the condition 
of the ovaries in all these specimens was typical of stage 1. There 
was no development of the eggs within the ovaries, and the condition 
seemed to be the same as in adults reared from pupee and dissected 
shortly after emergence. 
CONDITION OF THE OVARIES OF PARTLY ENGORGED ADULTS. 
Twelve specimens were taken which had partly engorged (+). 
The eggs within the ovaries of five of these specimens were not de- 
veloped at all, and showed a condition corresponding to stage 1. 
These lived from 16 to 30 hours after capture. Three specimens 
showed the ovaries in a condition typical of stage 5, with from 1 
to 4 fully developed eggs near the oviduct, and with the remainder 
of the ovaries filled with the small round type. These individuals 
lived from 12 to 21 hours after capture. The ovaries of two speci- 
mens which lived for 52 and 53 hours, respectively, contained a large 
number of eggs between stages 2 (PL I, fig. 2) and 3 (PL I, fig. 3), 
almost oval in shape, about 200 in all. Two adults were slightly 
more engorged than the rest, though not quite half engorged. They 
contained ovaries with eggs fully developed, of the same size and 
shape as eggs freshly deposited, but in very small numbers as com- 
pared with those found in adults dissected before oviposition. There 
were about 30 eggs in the ovaries of one and 50 in the other, which 
lived 45 and 47 hours, respectively. These adults had possibly en- 
gorged once, oviposited, and then developed the remaining eggs in 
the ovaries. 
In the condition of the ovaries of partly engorged adults these 
two points are worthy of notice: (1) No development of the ovaries 
took place unless the longevity of a specimen exceeded 40 hours; (2) 
stage 5 recurred in three cases. 
CONDITION OF THE OVARIES OF HALF-ENGORGED ADULTS. 
Five half -engorged (H — \-) adults were taken. The ovaries of two 
specimens contained eggs of the round type typical of stage 1. 
They lived for 7 and 21 hours, respectively. One adult contained 
ovaries filled with eggs of the typical oval shape (stage 3) in large 
