BIRCH CATERPILLARS 497 



silken threads. It chauged to a pupa witbin its case September 20, 

 and the imago emerged June 6. (Papilio, i, p. 15.) (See p. 167.) 



Larva. — Head rouad, 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, stitf white hairs, several of the hairs on the last two segments long 

 and 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 p)opinquilinea(jvoi& {Utau^. 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" as food-plant. Thaxter (Papilio, Jan., 1883, vol. 3, p. 11-12) gives notes 

 on the larva, which feeds on Betula, Juglans, Acer and Quvrcus. (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. Subterminal space very wide; subtermiual 

 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. Tegula? 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™™; length of body 15™™. (Grote). 



40. Charadra deridens Guen. 



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 Giien. (Hist. nat. d. ins., 1852, vol. 5, Noct.,vol."l, 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™™ (1.40 inches. Hy. 

 Edwards and Elliot). 

 5 ENT 32 



