Sept. 1899J Dyar : Life-History of Cochlidion avellana. 207 



Stage VI. — As before, the tubercles still distinct, the tail a little 

 notched on the end ; setse nearly if not quite as large as before. Skin 

 granules dense, but not exactly contiguous, round, each with a crown 

 of rough points or tiny granules or roughly tufted centrally (Plate 

 V, Fig. 10); none papillose. The granules cover the tubercles and 

 extend on the bases of the setse. Yellowish green, depressed spaces 

 all pale yellow, a little paler than the yellow subdorsal line ; (4) with 

 round dark centers. The subdorsal line is edged above with dark green ; 

 a row of yellow dots on lateral ridge ; the transverse line on joint 3 

 joins the white subventral line as before and is edged before with 

 salmon brown-. Subventral space finely granular, spaces (7) and (8) 

 obliquely confluent, not pigmented ; setse iv and v distinct, whitish. 

 Length, 6.3 to 9.1. 



Stage VII. — (Plate V, Fig. 11). — Shape as described. Lateral 

 ridge a little segmentarily scalloped, especially posteriorly. Smooth, 

 not shining except on the depressed spaces ; skin densely irregularly 

 clear granular, the granules perfectly smooth (Plate V, Fig. 12) ; 

 tubercles absent, setse imperceptible except the subventral ones which 

 are about as distinct as before. Head green, jaws and eyes brown, 

 retracted as usual. Body yellowish green, bright green pigment in 

 the dorsal portion, clear green on lateral ridge and below. Subdorsal 

 line yellow, slightly waved, edged above with dark green and centered 

 with a series of dark red segmentary dots ; transverse line on joint 3 

 free from the subdorsals, joining the white subventral line, yellow, 

 edged before more or less with crimson, sometimes distinctly so, the 

 color even traversing the yellow in the center of the dorsum. A row 

 of pale yellow dots on lateral ridge. Depressed spaces pale yellow, 

 (i) and (4) green centered, the center of (i) not a dot, but a trans- 

 verse slit, showing its paired origin. All the depressed spaces show 

 the glandular dots faintly. Length, 8.5 to 12.5 mm. This stage 

 lasts ten days as in y-inversa. On the. eighth day the color whitens a 

 little, but only a little and the tint only pales decidedly when the larva 

 loses its hold on the leaf. 



Cocoon. — With the characters of the group. Hofmann says it is 

 spun on the leaf and falls to the ground in autumn. 



Food-plants. — Hofmann gives oak, beech and chestnut. My larvse 

 fed readily on the black oak {Quercus coccinea'). 



