6 BULLETIN 598, U. S. DEPARTMENT OF AGRICULTURE. 



somewhat faster than any of the others, and nearly all of them 

 attained the ninth instar before pupation, although those hatching 

 very late passed through only eight instars. Those reared on apple 

 developed more slowly and passed through only eight stages, while 

 the larva? on pear passed through either eight or nine. The length 

 of stages of larva) feeding upon these plants will be given in detail 

 in the discussion of seasonal history. 



In confinement Iarva3 would feed on the foliage of many trees 

 upon which they could not mature. Attempts to rear larvae from 

 hatching to pupation on sour cherry (Early Richmond variety), 

 red oak, and slippery elm were unsuccessful. Those fed on oak 

 and cherry passed through the early molts with regularity, but 

 growth was slower than that of those reared on walnut and apple, 

 and finally stopped altogether. A few larva? that were started on oak 

 and cherry at the beginning of the second stage reached the seventh, 

 but were undersized and unhealthy in appearance. Elm was more 

 distinctly unfavorable than either oak or cherry. Larva) placed upon 

 elm immediately after hatching failed to pass even the first molt, and 

 those transferred from walnut as late as the fourth stage failed to 

 pass the seventh. 



Table I gives a list of the food plants recorded in entomological 

 literature and in the records of the Bureau of Entomology with the 

 authority for the previously published records. In this list nomencla- 

 ture of the native species is according to Gray's Manual of Botany, 

 seventh edition (1907), and the nomenclature for imported species is 

 that of Bailey's Standard Cyclopedia of Horticulture. 



TABLE I. A list of native and imported food plants of the hickory tiger-moth 



(Halisidota caryae). 



Acer saccharinum L. Silver maple. (Beutenmtiller 1890.) 

 Acer pscudoplatanus L. Sycamore maple. (Beutenmiiller 1890.) 

 Acer rubrum L. Red maple. (Beutenmiiller 1890.) 

 Acer negundo L. Boxelder. (Beutenmiiller 1890.) 

 Acer saccliarum Marsh. Sugar maple. (Beutenmiiller 1890.) 

 Acscnlus glabra. Welld. Buckeye. (Beutenmiiller 1890.) 

 Almis rugosa (Du Roi). Alder. (Beuteumiiller 1890.) 

 Bctula a. var. papyrifcra Marsh. Paper birch. (Beutenmiiller 1890.) 

 Detula populifolia Marsh. Gray birch. (Beutenmiiller 1890.) 

 Carpinu* caroliniana Wall. Hornbeam. (Beutenmiiller 1890.) 

 Carya sp. Hickory. (Harris 1841.) 

 Can/a alba (I.) White hickory. (Beutenmiiller 1890.) 

 Carya glabra (Mill.). (Beuteumuller 1890.) 

 Castanea dentata (Marsh). Chestnut. (Beutenmiiller 1890.) 

 Celtis occidental L. Hackberry. (Beutenmiiller 1890.) 

 Cratacfjus sp. Thorn. (Sonle 

 ..? oWoT"/f .Mill, Quince. 1 



1 COD firmed by writer. 



