126 Tryon Reakirt on Coloradian Butterflies. 



spots : — the antennae of Daunus and Rutulus appear to be more clavate 

 than those of Turnus. 



There are several other minor differences, such as the length of the 

 antennae; and shape and color of the lunula, &c, but the three 

 species can always be readily separated by the above given specia 

 characteristics. 



In Morris' Synopsis, under the description of this species, he quotes 

 Dr. Boisduval, that it {Rutulus) has not " the sagittate spots between 

 the border and discoidal cellule of P. Turnus." This is not always 

 correct, as I have a specimen from California, in which these are very 

 prominent — the same insect having the anterior wings somewhat 

 falcate. 



I was surprised to find this species indigenous to the Rocky Moun- 

 tains; my previous knowledge of the species had always led me to 

 consider it as strictly from the west coast. 



It is very probable that both Daunus and Rutulus are local and 

 completely segregated forms of Turn us having arisen from some of 

 the many varieties which widely disseminated species almost always 

 present, although the form of divergence is in opposite directions; 

 should Eurymedon be a variety of Rutulus, (of which, more anon) as 

 supposed by Dr. Gray, it would afford a further and successive grade 

 beyond the last of these related species. 



Extra-tropical North America thus furnishes, upon a much greater 

 field of distribution, an interesting example of a polymorphic species, 

 analogous to C. Ly caste, of northern — or to M. Polymnia of central 

 South America. 



Here however the proof of entire segregation, and consequently 

 complete format '01 of species, is more perfect than in either of these, 

 since in one locality, there are three, and in another, two of these sis- 

 ter races, co-existaut without amalgamation. 



In the Rocky Mountains, we have Daunus, Turnus, and Rutulus; 

 in California Rutulus and Eurymedon. 



Papilio Eurymedon, Boisd. 



Pup Rutulus, var ; G. E.. Gray. 

 Hab.— Pike's Peak, Colorado Territory. (Coll. Ent, Soc. Phil.) 



California, Washington Territory. (Coll. Tryon Reakirt.) 

 This I believe t) be the furthest extension of the series of segre- 

 gated forms, of which Fap. Turnus is the nucleus. The differences 

 between it and Rutulus are too constant, to admit of its beinsr a local 



