ORCHARD INJURY BY HICKORY TIGER-MOTH. 3 



seem preferable, since the insect belongs to the family of tiger-moths 

 (Arctiidae) and not to the family of tussock moths (Lymantriidae). 



SYNONYMY. 



LopJiocampa caryae Harris, 1S41. 

 Halcsidota annulifacia Walker, 1855. 

 Phcc/optera porphyrca Herrich-Schaffer, 1855. 

 Halisidota carj/ae (Harris) Grote, 1882. 

 Ealisidota caryae (Harris) Packard, 1890. 



DISTRIBUTION. 



The hickory tiger-moth is distributed over the northeastern United 

 States and the adjacent Canadian Provinces. According to rec- 

 ords of the Bureau of Entomology and literature, its range ex- 

 tends from the Atlantic Ocean west to Missouri, Minnesota, and 

 Saskatchewan, and from the Canadian Provinces bordering the 

 United States south to North Carolina and southern Ohio. Records 

 have been taken from the following States and Canadian Provinces: 

 Maine, New Hampshire, Vermont, Massachusetts, Connecticut, New 

 York, Pennsylvania, New Jersey, North Carolina, Ohio, Michigan, 

 Illinois, Wisconsin, Missouri, Quebec, Ontario, Manitoba, and Sas- 

 katchewan. It is probably much more frequent in New England 

 and the Middle States, however, since more than 75 per cent of the 

 reports of destructiveness have come from this region. 



DESCRIPTION OF STAGES. 



EGG. 

 (PI. II, fig. 4.) 



The egg is nearly globular, flattened on the side of attachment, 0.75 mm. In 

 diameter. The surface is glassy and in color it is a robin's-egg blue when 

 first deposited. A brown ring appears on the upper surface about the second 

 day, and in a few days the egg appears olive brown when viewed fron? 

 above, although when viewed from the side it is greenish. In about two weeks, 

 Just before hatching, it becomes leaden blue. Infertile eggs do not change 

 in color, but dry up in a few weeks. Eggs are deposited in a broad patch of 

 50 to 400 on the underside of the leaf. The writer has found one patch of 

 525 eggs. 



LARVA. 



(PI. I, PI. II, figs. 1, 2, 3.) 



Full-grown larva. Length, 32 to 38 mm. A striking grayish-white and 

 black hairy caterpillar. It is covered with short spreading tufts of grayish 

 white hairs, with a dorsal row of contiguous black tufts* which appear like a 

 velvety crest. These tufts occur on the first eight abdominal segments and a 

 small one may be seen on the ninth. There also may be a pair of slender black 

 pencils arising from the first abdominal segment, and another pair arising 

 from the seventh. These pencils may be very long, may be inconspicuous, or 

 absent altogether. The head and feet are black. The hair arising from the 

 thoracic segments is longer than that of the rest of the body and when the 



