68 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 125 
CasE.—Length to 9 mm, width 2-3 mm. Constructed of small bits 
of flat organic matter; occasionally placed to form a case square in 
cross-section, or more frequently polygonal to round. 
Ficures 196-201.—Oecetis pratti Denning, larva: 196, case, lateral; 197, head and thorax, 
dorsal; 198, left mandible, dorsal; 199, right mandible, ventral; 200, foreleg, posterior; 
201, hind leg, posterior. 
MaTERIAL.—Dominica, Pont Casse, 1.6 miles west, 24 April 1964, O. S. Flint, 
Jr., 1c, 30 larvae; same, but 28 April 1964, 1? ; same, but 29 April 1964, 6 larvae; 
same, but 18 May 1964, 19 ; same, but 16 June 1964, 29; Pont Casse, .4 mile 
east, 8 May 1964, O. S. Flint, Jr., 1 larva; same, but 15 June 1964, 29; Pont 
Casse, .5 mile east, 27 Jan. 1965, J. F. G. and T.M. Clarke, 1c 19 ; Pont Casse, 
1.3 miles east, 18 May 1964, O.S. Flint, Jr., 19 ; Pont Casse, 12-14 Oct. 1964, 
P. J. Spangler, 5 9 ; same, but 23 Nov. 1964, 1? ; same, but 8-13 Oct. 1966, A. B. 
Gurney, 19; Freshwater Lake, 22 Feb. 1964, D. F. Bray, 1; Clarke Hall, 
14 Oct. 1966, E. L. Todd, 19. 
