246 Journal New York Entomological Society. [Vol. vi. 



Stage VI. — Shape as described. Absolutely smooth, finely clear 

 granular, the granules low, rounded, contiguous, but not appressed, 

 without a trace of the rosette spines. Depressed spaces rather small, 

 but sharp, the latticed ridges not less than five granules wide. Spaces 

 very finely granular in the bottom ; ( i ) flat before, with green glan- 

 dular center, (2) rounded, highest in the center, (4) elongate. Pale 

 yellowish-green, shading to nearly colorless on the lateral ridge, the 

 dorsum and upper part of lateral area on joints 6 to 11 distinctly 

 spotted with emerald green pigment. A narrow yellow sub-dorsal 

 line, straight, but slightly crinkly edged, on joints 4 to 13, the pair 

 free and uniform (Plate XI, Fig. 10), or partly or wholly connected 

 by a yellow bridge, usually with a small red spot (Plate XI, Fig. 8), 

 or rarely a rather large one covering joints 7 and 9 and widened on 

 joint 8 (Plate XI, Fig. 9). The red spot varies in color from vermil- 

 ion red to light blue or dark slaty blue, edged with crimson. On 

 joint 3 in front, a transverse yellow line, edged with crimson below. 

 A series of red spots usually appears, beginning on the collar in front 

 and extending to joint 5, not discoloring the dorsal depressed spaces. 

 The spots are dull and diffuse. At the end of the stage the pigment 

 is all dissolved and the larva appears entirely transparent, dirty whit- 

 ish or waxy greenish, the internal organs visible in motion. It eats 

 for only a short time in this condition, and leaves the twig to spin. 

 Length, 4.8-8.2 mm., in some large larva; suddenly increased to 

 13.3 mm. at the end of the stage by the degenerative change in shape 

 accompanying the loss of the pigment. 



Cocoon as usual, elliptical, very small. The larvae do not leave 

 the tree, but spin in the crevices of the bark. 



Food plants . Black oak, chestnut, beech, iron wood. 



EXPLANATION OF PLATE XL 



Fig. I. Larva, stage I, side view enlarged. 



" 2. Two of the Y shaped setae more enlarged. 



" 3. Young larva, stage III, dorsal view. 



" 4. A section of the skin granules, back and sides, stage III more enlarged. 



" 5. A single skin granule with rosette spines, top and side views. 



" 6. Mature larva, front view. 



" 7. The same side view. 



" 8. The same, dorsal view, the usual colorational form. 



" 9. The same, showing the largest red spot seen. 



" 10. The same, showing the absence of the red spot. 



" II. Moth of Heterogenea shw-tleffii $ , suffused form. 



" 12. The same, O , normal form. 



