226 LLOYD'S NATURAL HISTORY. 



the central area being sometimes almost white. The fringes 

 are rusty brown. The hind-wings are ochre-yellow, suffused 

 with brown. 



The larva is slug-shaped, with an arched back and flat sides. 

 It is light green, without hairs, and covered with small shining 

 tubercles. On the back are two whitish longitudinal lines, 

 bounded by reddish-yellow, and on the sides is a yellow line. 

 When at rest the head is retracted under the second segment. 



It feeds on oak and beech. 



The transformation takes place in an oval cocoon between 

 leaves, in which the larva spends the winter, before passing into 

 the pupa-state. The pupa is soft and yellow, and has the parts 

 of the Moth outlined, as is the case in beetles. 



This insect is fairly common in woods in England. 



GENUS HETEROGENEA. 



Heterogenea, Knoch, Beitr. Insect, iii. p. 60 (1793); Stephens, 

 111. Brit. Ent. Haust. ii. p. 84 (1829); Treitschke, Schmett. 

 Eur. viii. p. 13 (1830). 



This genus somewhat resembles the last, but the antennae, 

 palpi, legs, and abdomen are all much more slender and less 

 pilose; and the wings are unicolorous. The fore-wings are 

 trigonate, and somewhat truncate at the extremity ; the hind- 

 wings are rounded. The larva is ovate, naked, and depressed. 



THE TRIANGLE MOTH. HETEROGENEA CRUCIATA. 



Heterogenea cruciata, Knoch, Beitr. Insect, iii. pi. 3, figs, i-io 



(1783). 



Bombyx asella, Fabricius, Mant. Ins. ii. p. 121, no. 117 (1787). 

 Tortrix asellana, Hiibner, Eur. Schmett, vii. figs. 166, 167 



(1803?). 

 Bombyx asellus t Godart, Lepid. France, iv. p 282, pi. 228, fig. 



3(1822), 



