Studies on Life-history of Bomhycine Moths. 69 



Saunders. On abdominal segments 1 to 8 is a row of eight double 

 dorsal black tufts, appearing as if single wedge-shaped tufts; the 

 first tuft is higher and narrower than the others; the 7th one much 

 shorter and wider, the others in front gradually becoming more like 

 it in shape, going backwards. A pair of lateral black tufts on the 

 1st and Yth abdominal segments, projecting slightly beyond the 

 yellow hairs ; the hinder pair is a little thicker than the front pair. 

 From the thoracic segments arise about six slender long white 

 pencils composed of few hairs which are nearly as long as the bod}' 

 is thick, and of uneven length. On the 8th and 9th segments are 

 (in all) three pairs of similar pale, whitish, very slender tufts. The 

 abdominal feet are pale livid ; the thoracic feet are black. 



For the sixth and seventh (last) stages, with a description of the 

 cocoon and pupa, see Dyar (Psyche, VI, 165). 



Life-history of Halisidota tessellata (Abbot and Smith). 



The following notes were made while watching the development 

 of a brood found feeding socially on the under side of a white ash 

 leaflet at Brunswick, Maine, August 12th. The brood had evidently 

 all undergone their first molt. When disturbed they fell ofi" and 

 let themselves down by a thread. (Since these notes were prepared 

 Mr. H. G. Dyar has published in Psyche, VI, 164, descriptions of 

 all the stages (nine) of this larva; but without giving measurement 

 of the length of the larva, though careful measurements of the head 

 are given.) 



Stage //.—Length 6 mm. The body is rather broad and flat- 

 tened, slightly decreasing in width to the end. The head is shin- 

 ing black, nearly as wide as the body. The body is greenish-yellow, 

 with a livid hue; it is yellow on the three thoracic segments, and 

 on the 8th abdominal. The piliferons warts are large, black, con- 

 spicuous, giving rise to sparse radiating bunches of grayish-white 

 hairs of unequal length. Some of the dorsal hairs are blackish, and 

 of these about half a dozen arising from the thoracic segments, and 

 two from the 8th abdominal segments are about half as long as the 

 body, the longest ones, however,, occurring on the thoracic region 

 of the body. 



Stage III. — Length 12 to 15 mm. (Described soon after exuvi- 

 ation.) ^'ow the generic characters are assumed. The head is 

 entirely black, except the front of the clypeus, the lobes of the 

 labruni, and the basal joint of the antennae, which are white. The 



