308 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



Mr. S. H. Scudder has fouud it on the black birch. *' It forms a 

 cocoon by spinning in the midst of a bunch of leaves a close and firm 

 cocoon of a bluntly fusiform shape, having a long neck extending above 

 and below (it hangs perpendicularly) to the end of the many threads; 

 open at both ends by an aperture about one-tenth of an inch in 

 diameter." 



Larva.— Of the color of the twig (of black birch), dall brownish-red, speckled con- 

 siderably, and especially above, with dirty-white specks, arranged very frequently 

 in lines, either longitudinal on the sides or curved forward above and becoming 

 transverse. Head a little paler than the body ; labrum and feet at base whitish. 

 On the posterior portion of the fifth and eighth segments above there is a transverse 

 paler ridge bordered with black. Length, 2 inches. 



Moth. — Delicate ocher-yellow, with a reddish tinge toward the edge of the wings 

 and on the head and front of the thorax. Fore-wings with two lines, often inter- 

 rupted, or only developed on the costa ; inner line on the inner third of the wing; 

 the curved outer line, beginning near the inner, diverges and follows a sinuate 

 course, ending much nearer the apex than the inner line, the distance varying; 

 both wings speckled, sometimes thickly, with unusually large spots ; outer edge of 

 both wings deeply excavated, especially opposite the second median venule. On the 

 hind wings no lines ; an obscure discal clot centered, with a short translucent line. 

 Beneath, much as above, but no lines, except in one case a diffuse dark line crosses 

 the hind-wings. (The female differs in the usual characters of the dentated forms.) 

 Fringe dark, whitish in the notches on both wings. Expanse of wings, 2 to 2.20 

 inches. 



67. Geometrid larva. 



This measuring worm was observed to be common on the hickory in 

 the Arnold Arboretum at Jamaica Plains, June 4. 



Larva. — Body thick, of uniform diameter throughout its length. Head brick-red, 

 granulated with fine yellow tubercles, about as wide as the body. Prothoracic seg- 

 ment reddish above, spotted with black. Body bright straw-yellow low down on 

 the sides and beneath, including the spiracles. Above, with alternating yellow and 

 brown lines, the black lines inclosing about eight yellow ones. Length, 22 to 25™™. 



68. Geometrid larva. 



This larva is a general feeder on the pig-nut hickory and Ostrya vir- 

 ginica^ and resembles a canker worm {A. pometaria). It was common, 

 May 30, at Providence. 



Larva. — Pale green, color of the leaf it feeds on. Head small, round, two-thirds 

 as wide as the body, which is rather thick. A rudimentary pair of feet on the fifth 

 abdominal segment. Two subdorsal white threads, and a much narrower lateral 

 thread line ; in one specimen a dark dot behind each spiracle; sutures yellowish white. 

 Length, 22 to 23™™. 



69. Geometrid larva. 



This measuring worm occurred May 30, at Providence, on the pig-nut 

 hickory. 



Larva. — With large clasping prothoracic legs. Head somewhat square in front, as 

 wide as the body, with reddish-resinous short curved lines. Segments much tuber- 

 culated on the sides, some of the tubercles bearing the spiracles. A broad, irregular 

 spiracular line ending on the first pair of legs. Body black above, with a broken 



