TABLE OF CONTENTS. xix 



Page 



Genus Papilio 1345 



ExcUKSUS LII. The Law of Suffusion in Butterflies 1350 



Papilio polyxcnes 1353 



FAMILY HESPERIDAE 1365 



Tribe Hesperidi 1373 



Genus Eudamus 1378 



Excursus LIIL Effect of Cold on Development 1383 



Eudamus proteus 1386 



Genus Epargyreus 1393 



Excursus LIV. Odd Caterpillars I397 



Epargyreus tityrus . I399 



Genus Acbalarus 1412 



Excursus LV. Variations in Habit and in Life according to Locality and Season 



of the Year 1415 



Achalarus lycidas 1418 



Genus Tliorybes 1423 



Excursus LVI. Some Singular Things about Caterpillars 1427 



Thorybes bathyllus 1432 



Thorybes pylades 1436 



Genus Thanaos 1445 



Excursus LVII. Nests and other Structures made by Caterpillars 1454 



Thanaos lucilius 1458 



Tbanaos persius 1468 



Thanaos juvenalis 1476 



Thanaos horatius I486 



Thanaos terentius 1490 



Thanaos martialis 1493 



Thanaos ausonius 1498 



Thanaos brizo 1500 



Thanaos icelus 1507 



Genus Pholisora 1514 



Excursus LVIII. The Perils of the Egg 1518 



Pholisora catuUus 1519 



Genus Hesperia 1527 



Excursus LIX. Anomalies in Geographical Distribution 1531 



Hesperia montivaga 1536 



Hesperia centaureae 1542 



Tribe Pamphilidi 1546 



Genus Ancyloxipha 1551 



Excursus LX. A Budget of Curious Facts about Chrysalids 1554 



Ancyloxipha uumitor 1558 



Mi 



