MEHIOIES OF THE IS'ATIOXAL ACADEMY OF SCIENCES. 
107 
Harris, Ins. Inj. Veg., Flint's edit., p. 429, 1862. 
0?‘o<eanil Jiohinson (quott3 Angus in lit.), Proc. Eut. Soc. Phihul., vi, p. 11, 1866, 
D, fValsh, Practical Entoiu., ii, p. 7, 1866. 
Harris, Entom. Corresp., p. 308, pi. 2, !ig. 4, 1869. 
Lc Baro)\, 4tli Illinois Rept., p. 186, 1873. Life liistory (tigs.). 
French, Trans. Diqit. Agr. III., xv, p.^189, 1877. 
J. Marten, 'iVaus. l)c])t. Agr. 111., xviii. Append., p. 119, 1880. • 
J). Coquillctt, Tr.ans. iJept. Agr. 111., xviii, Append., p. 167, 1880. 
ir. Saunders, In.s. In|. Fruits, p. 61, 1883. 
jr. Bentenmnller, Cim. Ent., xx, ]». 16, 1888. (Egg and all the larval stages.) 
Lugger, Hull. 10, Agr. Stat. Univ. Minnesota, ji. 78. March, 1890. PI. I, fig. 5, larva; PI. II, fig. moth. 
Moth. — Fore wings and base of thorax above cinnamon (ltidg.,MlIj 20); costal shade russet 
(Ridg., Ill, 10). not well marked. Thoracic })atcli ochraceoiis (Ridg., V, 7) in front, shading 
posteriorly into chestnut (Hidg., IV, 9). Lines and discal dots as in but the discal 
dots are frequently obsolete, and the outer oue, when well marked, is seldom linear. Tiie sparse 
iiToration, lines, discal dots, and fringe all concolorous, mars brown (Ridg., Ill, Id). Outer margin 
of fore wings distinctly scalloped, and hind wings also perceptibly so. Hind wings pale straw- 
yellow, cream buff (Ridg., Y, 1 1), immaculate or vslightly shaded with brown; abdomen a little 
darker. Underside a little darker than hind wings above, shading into brown on fore wings, 
especially toward the outer margin. Fringe dark, as above. 
Expanse of wings, 42-53 mm. 
' Paler in color than T>, anijmli; darker than 1), cali/ornica; distinguished from I), drexelii 
and y>. major by its smaller size and less distinct discal dots; from 1). drexelii further by the 
absence of a strongly contrasting costal shade; from J>. major by the usually ])aler secondaries; 
but in this last instance specimens may occur very difficult to distinguish (Dyar). 
The following description of preparatory stages of Datana ministra is by Mr. Beiitenmiiller 
(Can. Ent., xx, p. 10): 
Egg, — Pure white, ovoid, with llattened base, the apex with black dot showing impregnation. Laid in masses, 
from 25 to 50 on underside of leaf. 
Young larva. — Hoad black, shining, second segment orange-brown in front, cervical shield black. Body-color 
chestnut-brown, with the stripes a little darker, anal clasps and thoracic feet jet black. Length, 3 inm. 
After first molt. — The head jet black, as is also the whole of the second segment and anal segment. Body-color 
now much darker, as are also the strijics, these being almost obscured, except along the lateral region. Thoracic 
feet black. Length, 12 mm. 
After second molt. — Head black, rather small; second segment yellow except the cervical shield, black. The 
thoracic feet, abdominal and anal legs, and termination of anal segment jet black, while the stripes are very clear 
yellow on the chestiuit-browu ground. Scattered over the body are also a few short sordid white hairs. Length, 
20 mm. 
Until after this molt the larvm feed upon the iiudorside of loaf (parenchyma), and do not attack the edges 
until after the third molt begins. 
J//er third molt. — Head jet black, second segment orange, cervical shield black. Body color reddish brown 
with rather broad yellow stripes; anal clasps, tip of legs, and thoracic feet jet black; under.side Btrii)ed equally with 
reddish brown and bright yellow. Length, 30 mm. 
After fourth moll. — Hoad jet black, neck yellow, cervical .shield jet black, shining. Body chestnut-brown, the 
stripes bright yellow and equidistant; the feet and anal clasps jet black, abdominal legs yellow-banded, with jet 
black outside. The hairs over the body are now quite long. Length, 33 mm. 
Stage next to last. — Length, 26 mm. Head black, as wide as rhe body. First thoracic segment black. The 
body is yellow, not greenish yellow, as in the adult, and the stripes are reddish brown, the color of brown rooting 
slate. .Just before molting the first thoracic segment becomes gamboge-yellow on the plate and straw-yellow around 
the edges. A broad dorsal reddish-brown line, fully twice as wide as the others. There are four lateral stripes, all 
of the same width, the yellow spaces between lliem only a little more than one-half as wide as the brown hands. 
The third brown baud includes the black spiracles. Thoracic feet black ; suranal plate and anal legs black ; nud<llo 
abdominal legs dark, four of the legs pale livid reddish; planter pale. The hairs are minute, short, not apparent 
witliout a lens. 
The head and thoracic segments often held bent over backward, so that the thoracic feet stick up, while the 
tail is so bent up as to nearly meet the head. 
Last stage. — Length, 30 mm. Head black. Body with white, conspicuous hairs, many of them niie-third longer 
than the body is thick. The body is now distinctly greenish yellow, and the protlioracic plate gamboge-yellow. 
bSee Ridgway’s Nomenclature of Colors. 
