Sept. 1898.] Dyar : Life History of Calybia Slossoni^. 159 



Stage I. — Add : the dorsal and subdorsal brown lines are broken, 

 existing as dashes on the weak segments 4-5, 7, 9 and 11 ; 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 n 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 and n or 4, 7, 9 and 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 and 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 



