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 larve on pear passed through either eight or nine. The length 
of stages of larve feeding upon these plants will be given in detail 
in the discussion of seasonal history. 
In confinement larve would feed on,the foliage of many trees 
upon which they could not mature. Attempts to rear larve 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 larvee 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. Larve 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. 
TasLe I.—A list of native and imported food plants of the hickory tiger-moth 
(Halisidota caryae). 
Acer saccharinum L. Silver maple. (Beutenmiiller 1890.) 
Acer pscudoplatanus L. Sycamore maple. (Beutenmiiller 1890.) 
Acer rubrum L. Red maple. (Beutenmiiller 1890.) 
Acer negundo lL. Boxelder. (Beutenmiiller 1890.) 
Acer saccharum Marsh. Sugar maple. (Beutenmiiller 1890.) 
Aesculus glabra. Welld. Buckeye. (Beutenmiiller 1890.) 
Alnus rugosa (Du Roi). Alder. (Beutenmiiller 1890.) 
Betula a. var. papyrifera Marsh. Paper birch. (Beutenmiiller 1890.) 
Betula populifolia Marsh. Gray birch. (Beutenmiiller 4890.) 
Carpinus caroliniana Wall. Hornbeam. (Beutenmiiller 1890.) 
Carya sp. Hickory. (Harris 1841.) 
Carya alba (1.) White hickory. (Beutenmtiller 1890.) 
Carya glabra (Mill.). (Beutenmiiller 1890.) 
Castanea dentata (Marsh). Chestnut. (Beutenmiiller 1890.) 
Celtis occidentalis L. Wackberry. (Beutenmiiller 1890.) 
Orataegus sp. Thorn. (Souie 1891.) 
Cydonia oblovya Mill. Quince.* 
1Coufirmed by writer. 
