BIRCH CATERPILLARS 497 
silken threads. It changed to a pupa within its case September 20, 
and the imago emerged June 6. (Papilio, i, p. 15.) (See p. 167.) 
Larva. — Head round, slightly flattened in front, brown, smooth, and glassy. Body 
thickest near the middle, tapering to each end, of a dirty white, with a large black 
spiracular spot on all the segments except the last two. It is covered with spreading 
tufts of short, stiff white hairs, several of the hairs on the last two segments loug 
aud slender, extending over the end of the body. On each of the fourth and eleventh 
segments situated close together, one behind the other, are two short pencils of light 
yellowish red hairs, and on the same segments, just below the hinder pencils, is 
another longer pencil of the same color. All the segments are thickest through the 
middle. (Goodell.) 
Charadra propinquilineaGrote (Trans. Amer. Entom, Soc, Jan., 1873. vol. 4, p.293-<.94). 
Goodell (Papilio, Feb. 1881, v. i, p. 15) describes the larva of this species and gives 
"white birch" asfood-plant. Thaxter (Papilio, Jan., 1883, vol. 3, p. 11-12) gives notes 
on the larva, which feeds ou Betula, Juglans, Acer and Qutrcus. (Mrs. Anna K. Dim- 
mock, Psyche, iv, p. 274.) 
Moth. — Female. Size of C. deridens, from which it differs at first sight by the pro- 
pinquity and subparallelism of the median lines, which are not joined at the center 
of the wing as in our usual species. Whitish or bluish gray. Median lines distinct, 
propinquitous, subparellel, excavate. Transverse anterior line twice outwardly 
produced opposite the cell, and once inwardly on internal nervure. Orbicular spot 
round, evident, filled with whitish, with a central dark dot. Reniform spot con- 
tiguous to the transverse posterior line, incompletely ringed with a central dot. 
Median shade apparent above and below the orbicular spot, where it runs approx- 
imate to the transverse anterior line. Subterrainal space very wide; subterminal 
line apparent at the costa, afterwards faint, scalloped. The whitish frosting of the 
wing becomes lost externally. An interrupted terminal line formed by interspaced 
white and following blackish dots. Hind wings smoky, dark along the external 
margin. Head and thorax whitish. Tegulae with black marks. Beneath, the legs 
and thorax are clothed with whitish hair. The wings show double faint shaded 
darker transverse bands. Expanse of wings 40 mm ; .'englh of body 15 mm . (Grote). 
40. Charadra deridens G> sn. 
The following notes on this caterpillar by Mrs. Dimmock (Psyche, iv, 
p. 274) show that it is not uncommon on the birch. (See also p. 166.) 
Charadra deridens Guen. (Hist. nat. d. ins., 1852, vol. 5, Noct.,vol. 1, p. 35-36.) Saun- 
ders (Can. entom., Sept. -Oct., 1870, vol. 2, p. 145-146) describes the larva, and Lintner 
(Entom. contrib., no. 3,1874, p. 157) figures and describes it. Thaxter (Papilio, Jan., 
1883, vol. 3, p. 11-12) describes the egg, the seven larval stages, and the cocoon; the 
larva feeds upon red oak (Quercus), Betula, and Ulmus. 
41. Euplexia lucipara (Linn.). 
The moth has been reared from the birch and Viburnum by Mr. 
S. Lowell Elliot. 
Larva. — Emerald green. Head greenish testaceous; mouth parts pale pitchy. 
There is a very faint broken dorsal line, and a shading with a darker green over the 
entire back. Sutures between the segments yellowish. Spiracles very small, whitish, 
with a broad black ring. The lower lateral space is pale bluish green. On the top 
of the twelfth segment, which is somewhat smaller, are two small spots of 'clear 
white. The underside is wholly pale bluish-green. Length 35 mm (1.40 inches. Hy. 
Edwards and Elliot). 
5 ENT 32 
