INSECTS INJURING OAK- LEAVES. 171 



In third stage. — Much as before, but the luarkiugs more distinct. 



In fourth stage. — Color above and below on segments, one-third dull purple, tinged 

 with green dorsally. Below light greenish ; a patch of purplish in the substigmatal 

 region of each segment. Dorsal line with a bluish tinge. Head light brown. Length 

 16°"". 



Fifth stage, — Marked as before but less distinctly. Colors duller and darker. Length 

 25'"™ . 



Sixth stage, mature larva. — Dull blackish with a slight bluish-green tinge and late- 

 ral dull purplish shades, obscurely mottled. Dorsal streak indistinct, bluish white, 

 somewhat irregular. Subdorsal lines broken, but tolerably distinct, the superior 

 edged with blackish. Lateral streak white with a bluish tinge. Stigmata black. 

 Setiferous tubercles minute, black, ringed with bluish white; those below the lateral 

 line more distinct. The superior subdorsal line cuts the frontal plate of segment 1 

 very clearly, and is there tinged with yellowish. Rather stout, slightly tapering. 

 Length :35mra. (Thaxter.) 



Moth. — This species is of the color of 5. tvaJkeri, but differs at once by the even, pale 

 shaded distinct median lines on the fore wings, which latter are of a rusty olivaceous 

 ocherous. The reniform appears merely as a pale luniform mark, looking of a piece 

 with the t. p. line. This latter in S. walkeri is dark, single, narrow, irregular or 

 "wavy, or a little interspaceally notched over the median nervules. Hind wings 

 blackish, with fringes like the fore wings and thorax in color. Beneath like the fore 

 wings above, irrorate with black scales, with distinct blackish discal spot and median 

 baud, the latter centrally more deeply indented than usual. Costal edge of primaries 

 straight. Expanse of wings, 38""". (Gi-ote.) 



23L Amphipyra pyramidoides Guen. 



Professor Eiley found, May 28, 1873, the larva of this common moth 

 almost full-grown on the oak. It entered the ground June 5, and 

 issued as an imago June 25. He states that it feeds on oak, poplar, 

 grajje, Gercis canadensis, persimmon, and hazel. 



Saunders states that it also occurs on the thorn, and that when full- 

 grown the caterpillar descends to the ground, and, drawing together 

 some loose fallen leaves or other rubbish, spins a slight cocoon within 

 which it changes to a dark-brown chrysalis, from which tlie perfect 

 insect escapes in the latter |)art of July. 



Larva. — Nearly an inch and a half long, the 

 body tapering towards the front, and thick- 

 ened behind. The head is rather small, of 

 a whitish-green color, with the mandibles 

 tipped with black; the body whitish-green, a 

 little darker on the sides, with a white stripe 

 down the back, a little broken between the 

 segments or rings, and widening behind. 

 There is a bright-yellow stripe on each side 

 close to the under surface, which is most dis- Fig. 59.— Imago of Amphipyra pyramidoi- 

 tinct on the hinder segments, and a second des.— After Riley, 



one of the same color, but fainter, half-way 



between this and the dorsal line; this latter is more distinct on the posterior portion 

 of the body, and follows the peculiar prominence on the twelfth searment. The under 

 side of the body is pale green. (Saunders.) 



Moth. — The fore wings are dark brown shaded with paler brown and with dots 

 and wavy lines of dull white; the hind wiugs are reddish with a coppery luster, 



