m 



dusky, dorsal stripe often visible Inward the time ol issuing, — "all the more 

 remarkable thai there is no such stripe <>n the imago, .when as in. vernata, 

 w here the imago has such a si ripejl is noi indicated in the chrysalis." Mr. Mann 

 stales ( Proc. Bost. Sue. Nat. Hist., wi, 163, 1^7 1 ) thai the pupse of I he females 

 of A. autumnata have well-developed wings. He says they were developed 

 "even to such a poinl thai in all which I examined for the purpose, six or 

 more, 1 counted the eighl veins of the wings as ridges, and distinguished the 

 fifth or intermediate vein as arising from the discal nervure." This will 

 undoubtedly apply to the other species of this genus and the family where 

 the females are wingless. As to the causes lor the abortion of the wiiii^s in 

 the females, it seems probable that this remarkable secondary sexual charac- 

 ter may have been originally due to seasonal changes acting on the adult 

 insect, and become a matter of inheritance, as we know that wingless (or 

 partially so) species of beetles and Hies are (he result of the physical agencies 

 manifested on islands or from disuse. The local distribution of the canker- 

 worm seems due to the fact that the females are apterous. We know that 

 there are in the Phalcenidce different grades of the apterous condition, hence 

 the causes which produced such changes must have been comparatively 

 slight, 



PHlGrALIA Duponchel. Plate 4, tig. 16. 



Ipoi '" i "1 ii I Hi I ii i. i iii part), \ Viz.. 319, I Si ■ . 

 Amphidasis Treits. (in part), Sebm. Eur., vi (i), 229, 1827. 

 Phigalia Dup., Lep. France, vii (iv), 296, 1829. 

 "Amphidasis Stepb. (in part), Cat. Lep., ii. 1 IT. 1829." 

 Hibernia Boisd., Gen. In.!.. 194, 1840. 

 Amphidasi/s H.-Scli. (in part), Scum. Eur., iii, 99, 1*47. 

 Phigalia Stepb., Cat. Br. Lep., 161,1850. 



Lederer, Verh. Bot. Zool. Ges. Wien, 177. 1853. 



Guun., Thai., i, 195,1857. 



Walk., List Lep. II. t. Br. Mus., xxi,-J!>7, I860. 



Male. — Antennae well pectinated, the pectinations long and very slender. 

 The palpi are a little longer, and the body is rather stouter than in Aniso- 

 pteryx. Fore wings with the apex either as in Anisopteryx or more rounded; 

 the outer edge is shorter, and the hind wings are shorter than in Anisopteryx. 

 Venation: though so near Anisopteryx in its general appearance, it differs 

 much in tin- venation; the costal vein is tree from the subcostal; there are 

 lull live subcostal venules, no subcostal cell, and the subcostal venules are not 

 curved up toward thecosla as in Anisopteryx and Hybernia. The disposition 

 of the median venules is more like" that in Anisopteryx than Hybernia. 



