THE SPUKAD OK A Bl'TrKKH-Y IN A NKW REGION. 1175 



and iiri' t'ainiliiir to everyone tVoin tlicir frieiidlv Iiul)it8 iiiid curmpicuoua 

 color. 



The cjjfjs are Hiifjiir loaf sliaped, fully twiee as liijjli an l»r()a(l and t'lir- 

 niMlied with pnmiiiu'iit l(>n<;itiidiiial n\)s. The jiivciiih' larvae are furnished 

 witii lonfi, hair-like appeiidafjes, taperin<f slij;htly, Imt at the tip expanding 

 into a (U'lieate enp. The mature larvae are lon^r. slender and cylindrieal, 

 tapering nilightly at either end, the head appearing eontiniious with the body. 

 Being almost exaetly the same ehnde as the leaf upon which they feed they 

 are readily overlooked, although the pale, stigmatal hands of some species 

 render them a little more conspicuous. Among the hairs upon the surface 

 arc some mounted on more prominent papillae ; these are hollow tubes 

 through which a Huid is emitted at the infimdibuliform tip, to support 

 which the edge ot'thc latter is furnished with a fringe of a few excessively 

 fine hairs which enables a globule many times larger than the tip to be sup- 

 ported by it ; the globule is under the control of the creature and one may 

 see it enlarge under his eye ; it attains a diameter of .075 mm., and the sup- 

 porting hairs arc of about the same length. They are voracious feeders and 

 gorge themselves till they seem near bursting. The chrysalids have the 

 sides of the bo<ly ridged and at the third abdominal segment elevated to 

 a more or less distinct point ; the middle of the thoi-a.x has a similar dorsal 

 elevation and the rounded front of the head is produced anteriorly into a 

 short, blunt tubercle ; they are generally rather pale green or yellow flecked 

 with black. 



EXCURSUS XL VI.— THE SPREAD OF A BUTTERFLY IN A 

 NEW REGION (WITH A MAP). 



Los pnpilloiis rouleur tie nei;;e 

 Voloiit par essiiiins siir la iiier; 

 Reniix papillons blancs, quaiid poarrai-je 

 Prendre le bleu cliemiii ile I'air? 



TiiKopuiLE OAVnv.R.—Pantoum, 



DiFKKKKNT raccs of men havc not always occupied the regions which 

 they now inhabit, but from the earliest times one wave of migration has 

 followed another in a manner that has proved very perplexing to the eth- 

 nologist attempting to follow them. That lower animals also have had 

 their migrations has been frequently proved by the occurrence of their 

 remains in regions where they are not now found. Secular change of 

 climate has been the great moving cause of most of the migrations of which 

 we have any knowledge, with the single exception of the influence of man, 

 anil particularly of civilized man ; he is everywhere upsetting the arrange- 

 ments of nature, directly or indirectly extenuinating all forms which cannot 

 endure his presence or withstand the balefid influences which follow in hie 

 train. To minister to his wants, for instance, he brinfrs into a new region 



