308 THE BUTTERFLIES OF XEW ENGLAND. 



Six of the feAV fossil butterflies known belong to this tribe, or more than 

 one-third of the whole number ; of these five were found at Florissant, Col., 

 and belong to as many extinct genera, distantly related to Junonia ; the 

 remaining species comes from Croatia and belongs to the genus Eugonia, 

 and is indeed very closely related to our species. 



Table of genera of Vanessidi, based on the egg. 



Eggs deposited side by side in layers. 



Egg higher than broad, with eight or less vertical ribs, and laid around a twig. 



Ribs decidedly higher on summit than on sides Eugonia 



Ribs only a very little higher on summit than on sides Euvanessa. 



Egg of equal height and breadth, with at least nine vertical ribs, and laid on the surface of 



a leaf Aglais . 



Eggs deposited singly or in chains one above another. 



Free space at summit of egg half the diameter of base Junonia. 



Free space at summit much less than half the diameter of base. 



Egg, including vertical ribs, distinctly narrower at middle of upper third than at 

 broadest, the whole upper half gradually narrowing, the body of the egg much less 



shouldered above than in Vanessa Polygonia. 



Egg, including vertical ribs, hardly narrower at middle of ujjpcr third than at broad- 

 est, the body of the egg distinctly though roundly Miouldered above "Vanessa. 



Table of genera, based on the caterpillar at birth. 



A pair of bristles beneath the abdominal spiracles Polygonia. 



A single bristle beneath the abdominal spiracles. 



Subdorsal bristles of abdominal segments barely in advance of the middle of the segments. 



Infrastigmatal bristles of abdominal segments directly beneath the spiracles 



Euvanessa. 

 Infrastigmatal bristles of abdominal segments distinctly in advance of the spiracles... 



Aglais. 

 Subdorsal alidominal bristles in the middle of the anterior half of the segments. . .Vanessa. 

 (Eugonia and Junonia not seen) . 



Tahle of genera, based on the mature caterpillar. 



Head crowned with prominent spines. 



Spinules of body spines arranged in a stellate manner Polygonia. 



Spinules of body spines not arranged in a stellate manner. 



Spines of thoracic segments bearing no spinules on basal half Eugonia. 



Spines of thoracic segments furnished with spinules throughout Junonia. 



Head destitute of conspicuous spines. 



Second abdominal segment without a mediodorsal spine Euvanessa. 



Second abdominal segment with a mediodorsal spine. 



No mediodorsal spine on first abdominal segment Aglais. 



A mediodorsal spine on first abdominal segment Vanessa. 



Table nf genera, based on the chrysalis. 



Ocellar tubercles developed as pointed processes. 



A small anterior mediodorsal tubei'cle on second abdominal segment. 



Mesothoracic tubercle large and very prominent, compressed-laminate, at least at tip. 



A minute but distinct suprastigmatal tubercle on eighth abdominal segment 



Polygonia. 

 Suprastigmatal tubercle on eighth abdominal segment scarcely perceptible or obso- 

 lete Eugonia. 



Mesothoracic tubercle moderate, almost uniformly tectate, the apex pyramidal. Aglais. 



No mediodorsal tubercle on second abdominal segment Euvanessa. 



Ocellar tubercles blunt, scarcely produced. 



Alar ridge sharply carinate, the dentations pointed Vanessa. 



Alar ridge bluntly carinate, the dentations inconspicuous and rounded Junonia. 



