;]27 



eyes. Anlcnnu' simple in Imlli sexes (e\ee|i( in .1. hisiilsdrin iiiid A. siihaltxitii, 

 where llievare well peel iniileil en llie li,-is;il hall'). I'alpi short, slender, |)()r- 

 rect : third joint short, not extendinii' nsnalU lievond the IViml. Kore winirs with 

 thecosta sliiihlly arcdied, sometimes very straii:hl; ;i|iex sometimes sliirhtlv 

 siibtidcate, outer edii'e usually Ix'ut slii:hlly (ui thelirsi median vemde. Hind 

 witiiis squarish, Ix'iit, or rounded. \ enation : usually a small, diamond-shaped 

 sui)coslal cell (in iiisuharid t here is no cell ) : the first sidicostal venule is some- 

 limes very loug, hut diti'ers much in leuirth in the diU'erent s|)ecies; in iiisul- 

 sarid, it is no louizcr than the second suhcostal venule. Hind leirs with the 

 til)i;v larire and much swollen; in the male with no spurs, or slender and 

 spurred, with all grades between; tarsi either one-iiinrth as long as the til)ia' 

 or as lung. (Jolonition : head often l)la(d< in I'ront ; body and wings white!, 

 whitish-oelireous, or brown and red, with from two to four lines on the fore 

 wings. 



Larva. — "Caterpillars moderately long, but still slender, a little cari- 

 nated on the sides, stift, with minute transverse folds, slightly swollen on the 

 posterior rings; head a little smaller than the prothoraeie ring atul retractile; 

 living principally on low ])lants and hiding l)y day. Chrysalides sid)lerranean." 

 — Guenee. 



This is a remarkably homogeneous gronj), and the species are nearly 

 always recognizable from the slightly-angulated wings, the sliort small head, 

 usually i)lack in front, and the slender, short, feeble palpi, and by the invari- 

 ably simple male antenna?. 



The genus may be divided into three well-marked sections, as indicated 

 in the synopsis of the species. In A. ossulata, the venation dillers from the 

 other species by the presence of two subcostal cells, while the origin of fiie 

 first and second median venules is very far apart. 



The most aberrant group is that re])resented by A. insiilsaria, in which 

 the costa of the fore wings is remarkably straight, and there is no discal cell 

 (plate 4, tig. o«); while the first subcostal venule is very short, and its origin 

 is situated beyond that of the liftli subcostal. These characters are certainly 

 of subgeneric value; but in other characters, tiie lliree species in this section 

 agree with the more normal forms. In the third and inghest section (C), 

 there is much variation in the venation and pioportions of the joints ot' tin; 

 leg, as well as in the degree of angulation of the winirs; iuit there is a com- 

 mon fades to the s 'clion. In no large genus will there prol>ai)ly l>e found a 



