Director's Annual Report. 15 
installed in the Laboratory that have, so far, given great satisfac- 
tion, and the birds have been placed therein. 
The unit is of No. 16 enamelled steel 3x3x2 feet outside 
measurement. ‘The doors open to the full width of the interior 
and fold back flat as shown in Fig. 4. ‘The doors close on surface 
of prepared fabric and are secured by Jenks locks with bolts top 
and bottom. ‘These cases are placed on wooden racks, light but 
Falconidse 
Circus hudsonius 
Buteo solitarius 
Corvidee 
Corvus hawaiiensis 
Heterorhynchus Corvus 
| xanthophrys hawaliensis 
exceedingly stiff and strong (Fig. 3), serving to keep the cases 
from contact with walls or floor and permitting removal of any 
unit without disturbing its neighbors. The trays are of the same 
metal in two sizes, supported on triangular runs 2.2 inches apart, 
welded to sides. For the single cases the dimensions are 22 x 32.7 
inches with a depth of 1.7 inch; the smaller size trays for the 
double cases are 22x15.5 inches. The gauge of the larger trays 
is No. 20; of the smaller, No. 24. [The double cases have a par- 
tition in the middle, each half with its own door. ‘The bottoms of 
[131] 
