OF WASHINGTON, VOLUME XI, 1909. 167 



DESCRIPTION OF THE SEVERAL STAGES IN DETAIL. 



Egg. Elliptical, flattened,, yet moderately thick, shining, colorless, 

 transparent like a drop of water, the skin minutely hexagonally 

 reticulate. Size 1.8 mm. X 1.2 mm. Laid singly on the back of a leaf. 



Stage I. Elliptical, the dorsum flattened, concave, the sides sloping, 

 of normal c/eorshape. Horns conical, the subdorsal row present on 

 joints 4, 5, 11, and 12 large, the others subequal. Colorless; whitish, 

 shining, the middle portion yellowish ; skin smooth ; seta; on the horns 

 black. Subdorsal horns of joints 3-5, 11-13 three-haired, those of 

 joints 6-10 two-haired; horns of the lateral row on joints 3, 4, and 12, 

 three-haired, those of joints 6-11 two-haired. The short horns are 

 even and regular, none adnate to others, the one on joint 8 not larger 

 than the adjoining ones. Length, 1.3 mm. Duration of the stage, 

 one day. 



Stage II. Entirely translucent whitish, with a green tint from the 

 food. Subdorsal horns on joints 3-5, 11-13 large stout, subequal, 

 those on 5 and 11 the longest; of the lateral horns those on joints 

 4 and 12 are longer than the others ; all the horns stout, rounded, 

 many-spined, the spines black-tipped. Length, 1.3 to 2.5 mm. Duration 

 of the stage, four days. 



Stage III. Elliptical, rounded, the dorsum arched, venter flat, no 

 angles between the back and sides; subdorsal horns of joints 3-5 equal, 

 long, longer than the width of the body, well spined ; horn of joint 

 6 minute; those of 7-10 small, about spherical, spined; of 11 and 12 

 stout, conical, about half as long as those of joint 3, spined; of 13 

 about like 3, long, the pair divaricate posteriorly. Lateral horns of 

 joint 3 short, conical; of 4 long, slender, nearly as long as the sub- 

 dorsal of 3; of 6 very small; of 7-10 small; of 11 slender but about as 

 long as the subdorsal on the same joint; of 12 as long as the subdorsal 

 of 3. No spine patches nor caltropes. Translucent olivaceous green, 

 the spines on the horns black; a narrow white subdorsal line on 

 joints 6-10; a broad faint yellow band in the subdorsal ridge, waved 

 in its upper edge by the horns and faintly white-edged; a broken 

 whitish line in the middle of the lateral space; a faint opaque band 

 along the lateral ridge. The larva appears more flexible and elongate 

 than most Cochlidians. Length, 2.5 to 4.3 mm. Duration of the stage, 

 three days. 



Stage IV. Subdorsal horns of joints 3-5 equal, lung, those of joints 

 4-5 divaricate in a square; of 6 and 10 minute; of 7-9 small; of 11 half 

 as long as that on 5; of 12, half as long as that of 11; of 13, as long 

 as that of 3, slender. Lateral horns of joint 3 small; of 4 and 12 

 lung, as long as the subdorsal of 3; of 6 minute; of 7-9 moderate; of 

 10 smaller ; no horn on joint 5, the spiracle placed higher than on 

 the other segments. Translucent greenish ; dorsal line absent, 



