7 



SATYRUS II., III. 



unknown, and below the northern border of wliicli it docs not pass. And 

 Pcgala is confined to the district south of tliis belt, though probably it may 

 enter it here and there. The time may have been when the belt was occupied 

 by both these forms and intergrades, just as now Alojje and JVephcIe occupy 

 the northern belt. If AJope flourished in its larval state on meadow grasses, 

 which are not found in the Cotton States, rather than coarse saw grass or sea- 

 side grass, then its tendency would be toward the country which produced the 

 former, and there would \w a movement toward the north and northwest. 

 At the same time there would be a withdrawing of the parent form from the 

 borders of the original territory, because there the food plant was not in perfec- 

 tion, and so a belt would come to intervene between the parent and the variety. 

 The intergrades which had arisen would follow one form or the other, and tend 

 to revert to the parent or to become merged in the variety. Favorable condi- 

 tions might render one or more of them permanent, as with Alope-Tcxnna, 

 which now seems to possess a territory of its own to the southwest. Certainly 

 the parent form would be more or less modified l)y the absorption of the inte'r- 

 grades, if not permanently, yet so that now and then sports would l)e tiirown 

 out in the direction of Alope. Hence the occasional examples of two-eyed 

 Pegrda. That, on the other hand, the intergrades nearest the strong variety 

 would tend to merge in it also, when cross-breeding had ceased by the disappear- 

 ance of the parent form, we may infer from the fact that when Alope is sup- 

 pressed the tendency of the species is to the pure type JVephele, the intergrades 

 at last totally disappearing. * 



Alojje enters its dimorphic belt from the south and emerges Nephele on the 

 northern side, while within are all manner of intergrades. If in this belt the con- 

 ditions were to become unsuited to the support of any Satyriis, and the forms 

 which now occupy it were to become extinct, either suddenly or gradually, we 

 should have to the south Alo2)e and to the north Nephele, two good species, with 

 nothing, in the absence of intergrades, to show how one of these forms could 

 have been related to the other. The conditions would be similar to those be- 

 tween Pegala and Alope now. 



Pegala possesses in perfection many points which are found in one or other of 

 all the members of the sub-group. It is considerably the largest, though occa- 

 sionally an Alofje-Texana fully equals it. Its peculiar brown color on upper side 

 and gray-brown on lower side passes into Ahype, which gradually changes into 

 the darker shade of Nephele. The rufous becomes yellow in Alope, but breaks 

 out in that species in certain localities, as seen in var. Marltiina. After the band 

 has become suppressed in Nephele, every now and then it reappears in greater or 

 less degree, even in Oli/JiipuH and Boopi-^. A single ocellus is now a prominent 



