Studies on Life-history of Bomhycine Moths. 77 



hind edge are two hairs. The 2d and 3d thoracic segments bear 

 each a transverse row of four flattened dark brown conical tubercles; 

 the two inner and larger of which bear two hairs. All the abdomi- 

 nal tubercles bear but a single hair. 



The median dorsal tubercles (two on each segment and wanting 

 as usual on the thoracic segments) are elongated, while the outer 

 ones are irregularly rounded; the lateral tubercles are rather narrow 

 and elongated parallel with the length of the body. The hairs are 

 long and spinulate. A few hairs are longer than usual ; these arise 

 from the 2d and 3d thoracic and also the 8th abdominal segments, 

 and are about a third as long as the body. 



Stage II. — Length 4-5 mm. Described about one day after the 

 first molt. The head is as wide as the body and of a dark chest- 

 nut-brown. The prothoracic shield is distinct, crescent-shaped. 

 All the warts are concolorous in hue, moderately dark chestnut, 

 and most of them bear 5-6 hairs. The dorsal thoracic hairs are 

 about twice as long as the body is thick, as also are those on the 

 8th abdominal segment, but the others are rather shorter, and all 

 the hairs are uniformly of the same rather dark brown color, of the 

 same hue as the head. There are about 10 spinulose hairs arising 

 from the larger dorsal tubercles. The body is livid purplish all over, 

 the pilifcrous warts are now higher and fuller, but are chestnut- 

 colored, with a slight ruddy or purplish tint. The body is fuller 

 and thicker than before, while the hairs are somewhat shorter, and 

 all are of the same dark-brown color. The small median dorsal 

 tubercles bear 2 to 3 hairs, and the larger ones from 10 to 12 hairs. 



When 5 mm. long, later on in this stage, the body is purplish pale 

 flesh-colored; the warts purplish and quite convex, the hairs all dark 

 and longest on the 2d and 3d thoracic segments, those on the other 

 segments only a little longer than the body is thick. The body 

 beneath is paler. 



One about to molt is 7 mm. long. The body is mottled with 

 short irregular purplish lines, and there is an irregular lateral broken 

 pale narrow line. The warts are black at the end, and there is no 

 diff"erence in the color of the hairs on any part of the body, all of 

 them being nearly black, with no reddish ones. 



Stage III — Molted June 29th, and described before beginning 

 to eat on that date. Length 7 mm. The body is now stouter, and 

 the hairs on the three thoracic and 1st abdominal segments, also on 

 segments 7 to 10, are black-brown as before, while those on the 



