Sept. 1898.] Dyar : Life History of Calybia Slossonle. 159 
Stage I. Add: the dorsal and subdorsal brown lines are broken, 
existing as dashes on the weak segments 4-5, 7, 9 and n ; a slender 
brown marking between the horns of 4 and 13. Later a milky white 
shade along the subdorsal ridges, joining at the ends. Length, 1 to 1.5 
mm. 
Stage II. —Elliptical, flattened, dorsal space broad, level with the 
laterally extended horns; side area small. Horns 3, 4, 5, 8, 10, 12 
and 13 short, tapering, as long as the width of the dorsum, those of 
joints 7, 9 and 11 very short, conic, less than half as thick and about 
one sixth as long as the others. Long horns with many fine, flexible, 
spinulose white hairs toward tip, but above and at base mixed with 
smooth straight setae with dark tips. The short horns bend down and 
have only smooth setae; the long horns are all equal. Color uniform 
translucent whitish green, in some with rounded brown dots on joints 
4 > 7 an d 11 or 4, 7 > 9 ^fid 11 dorsally. The side area is covered by 
the subdorsal horns which are constricted a little at base, but are with¬ 
out separate basal pieces. Skin with clear setiferous granules as at ma¬ 
turity. The larva eats a channel in the leaf, in which it rests, the 
horns overlapping the uneaten leaf. Length, 1.5 to 3.1 mm. Duration 
of the stage 5 days. 
Stage III .—Shape essentially as in the mature larva, the dorsal 
groove broad and shallow. Horns of joints 3 to 13 of even length ex- 
cept 7 > 9 ^.rid 11 which are about half as long or a little over half as 
long as the others, thick, tapering, constricted near and at base, indica¬ 
ting the rounded basal pieces, but they are not furcate. Hair abundant, 
fine and spinulated as before with some smooth, dark tipped ones 
toward bases of horns ; primitive setae ii visible. Color all green, made 
whitish by the hairs. Skin as before. The horns are slenderer than 
before and look more numerous as those on the weak segments appear 
more distinctly. Length, 3.1 to 4.5 mm. Duration of the stage 5 days. 
Stage IV .—Much the same. The short horns are now about nine- 
tenths the length of the others and during the stage they fill out and 
become almost completely indistinguishable. The hairs are almost all 
the spinulose ones, only a few of the smooth, black tipped ones remain¬ 
ing. Horns long and slender, a little swollen at base, the basal pieces 
constricted off and obscurely furcate. Setae i and ii are distinct, on the 
basal piece and tip of horn respectively, smooth, dusky. Lateral horns 
minute, naked, tapering, enlarged at base and once constricted, con¬ 
cealed under the subdorsals. All green, usually no marks, sometimes 
with the dorsal red spots. The shade varies from leaf green to bluish 
