290 
OGDOCONTA. By Dr. M. Draudt. 
limpida. P. limpida Gn. (41 h) is also very similar to sciata, but much more monotonously coloured brown, strewn 
with grey, without the bronze tint in the central area or yellow irroration in the hind-margin; the small white 
acrata. maculae as in the allies, at the reniform macula outside a yellow spot. -— In ab. aerata Lyman the maculae 
are not white, but of the ground-colour. -— Canada, Eastern and Central States. — The purple brown larva with 
yellowish-white longitudinal stripes lives in the stalk of Arctium. 
ncbris. P. liebris Gn. (41 h) looks somewhat like a large limpida, but it is at once discernible by much darker 
brownish-grey hindwings; the forewing is of a more olive-brown tint irrorated with grey, postmedianly somewhat 
lighter; the whitish maculae are small and insignificant, the posterior transverse line is distally bordered with 
whitish; the undulate line is also composed of small whitish spots with small brown sagittary spots before them 
niiela. — In ab. nitela Gn. the maculae are not white, but of the ground-colour. Canada to New York and Illinois. 
-— Larva dingy whitish, with a purple tinge on the central rings, with whitish longitudinal lines; it primarily 
lives on Ambrosia trifida, but it also goes on many other plants, particularly cultivated plants, above all on 
corn, so that it may do much harm. 
beeriana. P„ beeriana Bird almost looks like the form aerata of limpida-, the forewing is uniformly smoky brown 
strewn with white, behind the postmedian line with a purple tint, with almost extinct markings, the reniform 
macula only indicated by a small darker spot, only occasionally surrounded by grey scales. Hindwing uniformly 
lacinariae. dark smoky brown. -— ab. lacifiariae Bird is the form with white-marked maculae, the reniform macula showing 
a brown central line, and the most central of the distal spots being yellow. Expanse of wings: 36 to 41 mm. 
Chicago, in the prairies. -— Larva light bluish-grey with a pink hue, of a robust structure, without any longi¬ 
tudinal lines. It lives in the root of Lacinaria pycnostachya. 
duplicata. P. duplicata Bird (41 i). Forewing deep bronze-brown strewn with white. Central and marginal 
areas browner, behind the postmedian line irrorated with purple grey; the double anterior transverse line is 
cpiite indistinct, the maculae are very small darker spots, the reniform macula with a lighter central line; the 
undulate line is composed of small yellowish-white lunae. Hindwing grey with a coppery-brown tint. — ab. 
obsolcscens. obsolescesis Strd. (= ab. 1 Hmps.) exhibits the posterior transverse line as well as the undulate line quite obsolete. 
New York. — The diaphanous whitish larva with a chestnut-brown head and a darker dorsal line lives in the 
rootstock of Collinsonia canadensis in a chamber. 
necopina. P. necopina Grt. (41 i) is an insignificant brown species densely strewn with a greyish white without 
any traces of markings, with reddish-brown hindwings being somewhat darker at the margin. New York, 
imperlurba- Buffalo, — ab. imperturbata Bird is a smaller form with lighter hindwings, a geographical race from Pennsylvania. 
ia - — The light red-brown larva with straw-coloured longitudinal lines lives in Helianthus tuberosus, that cf 
the subordinate form in Helianthus divaricatus. 
marUima. P. maritima Bird (41 i) is extremely similar to necopina, larger, with broader wings and darker 
than necopina with a distinct posterior transverse line and without the bluish tint in the subterminal area. On 
the Atlantic Coast near New York. — Larva light, of the colour of burnt Sienna, with dull yellowish-white 
longitudinal stripes; it lives in Helianthus giganteus. 
silphii. P. silphii Bird (41 i) is likewise extremely similar to the preceding species, but still larger with broader 
forewings of a browner ground-colour. Forewing smoky umber-brown, in the central area slightly darker, before 
and behind it with a very feeble lilac tint; the posterior transverse line towards the hind-margin mostly a little 
strewn with white on the distal side; the undulate line is rarely indicated by some small white scales, the 
reniform macula occasionally by a darker spot. Chicago. — The larva is dirty reddish with feeble yellowish 
longitudinal lines and a brown head; it lives in various species of Silphium (therebinthinaceum, perfoliatum, 
laciniatum). 
eupatorii. P. eupatorii Lyman (41 i) is the most abundantly marked species of all. Forewing deep bronze-brown, 
mixed with purple grey, particularly postmedianly tinted purple; all the transverse lines are visible, the posterior 
line distally bordered with white; also all the 3 maculae are indicated as darker spots, the undulate line as 
small whitish spots proximally bordered with a darker colour. Hindwing grey with a coppery brown tint. 
Canada to Pennsylvania. — The light Sienna-brown larva with a yellow head shows broad yellowish-white 
longitudinal lines and lives in Eupatorium, 
121. Genus: Ogdoconta Btlr. 
Proboscis well developed, the erect palpi of medium length, frons smooth. Thorax clad with scales, 
prothorax with a long flattened tuft, metathorax with a loose tuft. Abdomen with small tufts only on the 
two first rings. They are rather small slender insects with broad wings with a rectangular apex. Chiefly 
distributed in Northern America. 
muscula. 0. muscula ScLs. (42 f) is a small greyish-white species strewn with a dark brown, in some places 
slightly tinted ochreous, with a white oblique band from the apex to the centre of the hind-margin. Hindwing 
light brown with a darker margin. Mexico. 
