no. i. BOMBYCINE MOTHS OF NORTH AMERICA— PACKARD. 17 



extradiscal cell as in the two other genera named; on the whole Aglia approaches nearest to 

 Arsenura in venation, though the discal vein (or end of the discal cell) is exactly in the middle 

 of the wing, owing to the wing not being produced, while in Arsenura, and more especially in 

 Dysdsemonia, the outer portion of the wing is so produced or developed as to make the discal 

 cell appear very small and but little more than a third the length of the wing. [On the margin 

 is a pencil note.] Thus Aglia is nearest to South American genera. [Compare?] Bathyphlebia. 



In the venation Aglia also approaches Urota, i. e., in the ramification of the "subcostal" 

 (radius) vein III 2 , those of the common stalk of III! and III, is long in Urota, in Aglia there 

 being no such stalk; in the mode of origin of the independent vein IV 2 , while in the venation of 

 the hind wings there is also, in the essential features, a marked resemblance to Urota; thus 

 the origin of the veins IV t and IV 2 are much the same, the latter (independent) being detached 

 and assuming nearly the same position in the discal cell; the two discal veins taken together 

 forming a line of the same degree of obliquity, so that the shape of the discal cell is the same 

 in both genera, and though the cf Urota is tailed, the end of the discal is near the middle of 

 the wing (in the longitudinal sense) ; in 9 Urota the venation (involving the length of the 

 vein) is remarkably similar to that of Aglia, the branches of the radius (III) and median or 

 cubitus (IV 3 and V,, V,) being very similar, as well as the disposition of the two discal veins 

 taken together. 



The resemblance to the South American Eudelia, as regards venation, is much less marked. 



Legs unusually long and slender, not very densely scaled, and with two small unequal 

 spines on the hind tibiae; the fore tibiae rather long and slender; the tibial epiphysis is covered 

 with hair-like scales, there only being a bare space on the inside near the end; it is unusually 

 long and large in proportion to the tibia, being about three-fourths as long as the tibia, narrow, 

 flat, the end widened, not pointed. 



Markings: The ground color of the body and wings is a dull ochreous-fawn, with a heavy 

 dark-brown submarginal line common to both wings, an incomplete or rudimentary ocellus 

 in each wing, being a dark blotch centered by a white T, the shaft of the T pointing inward 

 and no longer than the cross ; the T is more regular and decided in the $ . On the under 

 side of the fore wings the T is more marked, the shaft triangular; on the hind wings forming 

 an irregular conspicuous triangular spot, rather than a T; the hind wings are also suffused 

 with rich brown and gray. 



Genitalia: A single pair of unusually large claspers nearly as long as abdominal segments 

 VII-IX together, very wade and convex externally, and ending within in a small obtuse projec- 

 tion, not forming a true spine. Suranal plate broad, curved downward and inward at the 

 extremity, which is forked, black, solid, densely chitinous. Compared with Polythysana, the 

 suranal plate is of nearly the same type, being a broad concave plate narrowing behind where 

 it curves downward and is forked at the end; but there is but a single pair of claspers, and 

 they are much simpler in structure, though larger, and not ending in a true hook, nor is there 

 present the upper pair of claspers, which are so marked in Polythysana. The penis is slender, 

 style-like, and the accussory part is triangular; these parts being much as in Anisota. 



Aglia appears to be a genus which has perhaps by migration to Asia and finally to eastern 

 and central Europe, been cut off from its ancestral forms and adapted to a cool moist climate. 

 The wings are of simple outline, without any tendency in the anterior pair to become falcate, 

 or in the hinder pair to become tailed, or if not tailed, angulated. The ocelli are alike in 

 shape and color on the wings of each pair, though those of the fore wings are smaller. The 

 coloring of the wings is less vivid and striking than in Polythysana. Its general similarity in 

 size, shape of body and wings, and in markings, to the smaller kinds of Saturnia has led to 

 its being regarded as a Saturnian. 



Egg. — Poulton describes the egg as being of very large size, about 2.5 mm. by 1.9 mm.; 



and as rather flattened on the upper surface with a slight central depression. The shape, he 



adds, is very like that of Smerinthus or Sphinx, but the size is somewhat larger. It is dark 



brown and laid upon bark. He obtained about 60 eggs from a single $ paired in confinement. 



83570°— 14 2 



