1908] 
Barth, Nestiur/ of Anucrahro Ocellatus. 
149 
an inch away. But true to instinct the entire process of entry 
must be repeated until the wasp disappeared directly through the 
door — certainly a waste of time and energy. To ascertain w^hether 
there is a definite rythm in this halting forward flight a large num- 
ber of observations were made on different individuals, two of 
vvhich will be considered sufficient here, the figure one indicating 
direct flight into the nest, two, one halt on the w^ay, three, two 
halts. Wasp No. i. i, 2, 2, 3, 3, i, 2, 2, i, i, i, i, i, little or 
no wind. 
Wasp Ah. 2. (Day quite windy) i, i, i, i, i, i, i, i, i, 
I, I, 2, I, I, I, I, I, I, I, 2, I, 2, I, I, 2, I, I, I, I, I, I, I, I, 
1, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, I, 2 (missed the 
entrance and flew back for a new start) i, i, i, i, i, 2, i, 3, i, 
1, I. I, I, I, I, I, 2 (back for new start) i, i, i, i, 2, i, i, i, i, 
I, I, I, I, I, I, I, I, I, I, I, 2 (back for a new start), i, i, i, 
(wind blew her back on the sand and when she finally entered 
she remained in the nest for twenty-three and one-half minutes, 
probably resting, as she then came out and resumed digging). 
She had as yet formed no cells. These figures show that no 
rythm is followed, the momentary halt being merely to gauge a 
more accurate arrival at a desired point. Nor is the flight made 
imdulating by the halt but continues in a straight line. 
The method of carrying a load also differs somewhat here- 
after. She now backs out and instead of merely flexing the head 
to hold the sand she brings an 'armful' of material — if one may 
so designate it — and holds it in place by flexing the head over it 
just as one would flex the chin over a heaping armful to prevent 
it from topling off. 
The number of loads which the wasp carries out in a given 
time is quite large. Occasionally she flies off, probably to feed 
or rest, but her absences during the process of construction are 
never very long. 
A few figures on one wasp will serve to illustrate the rapi'iity 
and amount of work done, as all others practically agree with 
these : — 
Between 10 A. M. and 10:6 she carried 19 loads ( 6 min.) 
Between 10:6 A. M. and 10:9:30 she carried 13 loads (372 min.) 
Remained in nest until 10 :37 :30 then flew off returning at 
10:42:50. 
From 10:43 to 10:45 4 loads (2 min.) 
10:58 to 11:1:30 16 loads (3^ min.) 
11:1:30 to 11:6 21 loads (4^ min.) 
11:6 to 1 1:1 1 23 loads (5 min.) 
ii:ii to ii:i6 22 loads (5 min.) 
