94 THE BUTTERFLIES OF NEW ENGLAND. 



Turning to the more abundant Alleghanian fauna, we may note that no 

 inconsiderable number of species pass northward even to the restricted 

 limits of the Canadian fauna, such as Cissia eurytus, Polygonia interroga- 

 tionis, Anosia plexippus (in its yearly excursions) among Nymphalidae, 

 while Cercyonis alope barely fails of reaching it ; among the Lycaenidae, 

 Incisalia niphon, Uranotes melinus, Thecla liparops and Everes comyntas ; 

 and among the Hesperidae, Thorybes pylades, Thanaos persius, icelus and 

 brizo, Pholisora catullus, Amblyscirtes vialis, and Limochores taumas. 

 On the other hand the natural limits of the bulk of the Alleghanian 

 species will be found to fall rather at the true middle line which we have 

 pointed out. Such species are Basilarchia astyanax, Speyeria idalia and 

 perhaps Hypatus bachmanii of the Nymphalidae ; Incisalia irus, Mitui*a 

 damon, Thecla Ontario, edwardsii and acadica among Lycaenidae ; Eu- 

 phoeades troilus among the Papilionidae ; and among the Hesperidae, 

 Epargyreus tityrus, Thanaos lucilius, martialis, juvenalis and hora- 

 tius, Ancyloxipha numitor, Poanes massasoit, Atrytone logan, Erynnis 

 sassacus, metea and attains, Anthomaster leonardus, Thymelicus aetna, 

 Limochores bimacula and manataaqua, Euphyes metacomet and verna, and 

 Lerema hianna. Here, too, will probably be found the dividing line ( in those 

 polygoneutic species which range far on each side of the line, as in Heodes 

 hypophlaeas) at which the number of broods in the season change, one more 

 brood occurrinof south of the line than north of it. The Alleghanian 

 species which seem to find their northern limits at the southern borders of 

 the broad belt are Junonia coenia and Euptoieta claudia among the Nym- 

 phalidae ; Xanthidia nicippe, Eurema lisa, Anthocharis genutia, Pieris 

 protodice and Laertias philenor among the Papilionidae : and among the 

 Hesperidae, Achalarus lycidas, Thorybes bathyllus, Thanaos terentius, 

 Hylephila phylaeus, Atalopedes huron, Thymelicus brettus, and Lerema 

 accius. But in addition to this list there are other butterflies more prop- 

 erly to be considered members of the Louisianian fauna, which in their 

 northernmost extension, creeping along the Atlantic coast, reach either quite 

 to this line of demarcation or stop barely short of it. These are, among 

 the Nymphalidae, Neonympha phocion and Chlorippe clyton ; among the 

 Papilionidae, Callidryas eubule, Iphiclides ajax, Jasoniades glaucus glau- 

 cus and Heraclides cresphontes in its recent extension ; while among the 

 Hesperidae may be mentioned Eudamusproteus andHesperiamontivagus. 



Some remarks upon the other insects which find their delimitations in 

 these same districts will be found in my paper on the distribution of the 

 insects of New Hampshire in the "Geology of New Hampshire," Vol. I, 

 where these lines of separation are marked in a somewhat different way 

 from less perfect knowledge. It can hardly fail of notice that the 

 faunal divisions as here laid down, plotted upon the same map with the 

 isotherms projected by Professor Davis, agree in a somewhat striking way 



