INSECTS INJURING OAK-LEAVES. 131 



177. Juvenal's skipper. 

 Thanaon juvenalis Westwood. 



The larva of this butterfly is not uucommou 

 on the white oak from early in September until 

 towards the middle of October in Providence. 

 We observed one caterpillar which (October 8) fig. 4i.— Larva (o) ana pupa 

 curled a leaf over its body and spun a thin floss Jli^trriSetder"- 

 of silk in which to transform. 



Thanaos ennius was originally regarded as the northern representa- 

 tive of Thanaos juvenalis Westwood, but Mr. Scudder now writes me 

 that he regards ennius as a synonym of T. juvenalis. In New England 

 this skipper is seen in meadows in May and again in August. 



Larva. — Body somewhat flattened, tapering towards both ends ; dull pea-green, the 

 skin granulated with distinct white pimples. A lateral white line. Head wider than 

 the prothoracic segment, bilobed, somewhat flattened in front, dark dull reddish- 

 brown, with each lobe of the vertex touched slightly with red-brown, and an orange- 

 red spot on the inside of each set of eyes. A dark median dorsal stripe and a lateral 

 yellow line; the lateral ridge whitish. Length, 26™™. 



Biitierfly. — Smoky brown on both sides; fore wings variegated above with gray, 

 with transverse rows of dusky spots, and six or seven small semi-transparent white 

 spots near the tips; six of these spots are disposed in a transverse row, but the two 

 hindmost are separated from the others by a considerable interval, and the seventh 

 spot, which is sometimes wanting, is placed nearer the middle of the wing. Hind 

 wings with a row of blackish spots near the hind margin. Expanse of wings, L6 

 inches. (Harris.) 



178. Thanaos hrizo Bois. and Le C. 



Besides feeding on a leguminous plant {Galactia glabella) the larva of 

 this skipper occurs on Quercus ilicifolia. (Scudder.) 



179. Smerinthiis exccecatus (Abbot and Smith). 



The larva of this sphingid moth has been found on Quercus imbricarius 

 and Q. obtusiloba by Professor Riley, who has communicated the follow- 

 ing description : 



Larva. — Normal form. Uniform pea-green. The papillte cream-colored and regu- 

 larly arranged in about eight annulets. A bluish vesicular medio-dorsal mark. 

 Yellowish-green oblique lines extending length of two joints, the last brighter yel- 

 low and extending up the caudal horn, which is also papillated. The thoracic joints 

 have a longitudinal yellow subdorsal line. The head is triangular, but bluntly so; 

 the front flattened, more polish9d, and deeper green, with less distinct papiliB and 

 separated from the hinder part, which is like the body, by a pale /\ relieved behind 

 by darker shade. Abdominal and thoracic legs rosy outside. Stigmata white with 

 heavy black annulations. — (Unpublished notes). 



180. Daremma undiilosa Walker. 



This sphingid feeds occasionally on the white and red oak. (W. J. 

 Holland, Can. Ent, June, 1886. See Ash Insects.) 



