Tryon Reakirt on Coloradian Butterflies. 133 



Pieris Protodice, Boisd. 



Scudder, Proc. Boston Soc. Nat. History, VIII, p. 180. (1861.) 



Hab. — (Western) — Rocky Mouutaius, Colorado Territory, (Coll. 

 Tryon Reakirt.) 



" California," (Edwards.) 



For the more eastern geographical distribution of this species, I 

 shall again quote Mr. S. H. Scudder : — 



"This butterfly also enjoys a wide geographical range, extending 

 from Texas on the South-west, Missouri on the West, and the mouth 

 of the Red River of the North on the north-west, as far as Connecti- 

 cut, and the Southern Atlantic States on the East. 



I have but two specimens ( % and $ ) from Colorado, although the 

 insect is quite common in July and August. The male is ve v y lightly 

 marked, but not less than individuals I have captured at Trenton, N. J. 

 The female agrees with Mr. Edwards description of P. Nasturtn, 

 Boisd., with the absence of " a faint coppery tinge" upon the black 

 spots, but it is not sufficiently at variance with our eastern varieties, for 

 me to separate it as that species. 



Taken in July and August. 



Pieris Occidetttalis, now sp. 



Hub. — Rocky Mountains, Colorado Territory ; California, (Coll. 

 Tryon Reakirt.) 



Male. Upper surface, white, base powdered with violaceous-grayish 

 atoms: a marginal row of isoscelate-triangular griseous spots on the 

 primaries, within these an interrupted, deep, black, maculate band, run- 

 ning from the costal to the inner margin : a short transverse bar upon 

 the arc, cut by a narrow white ray. 



Outer margin of secondaries furnished with a connected row of 

 sagittate marks, having a super-imposed deep black spot near the outer 

 angle : in some specimens, however, the hind wings are nearly im- 

 maculate. 



Under surface, white; the apex of the primaries, and the whole of 

 the secondaries, tinged with yellow : the markings of the upper sur- 

 face, repeated indistinctly below; a large black spot near the inner 

 angle of the primaries. 



Secondaries, — veins broardly bordered with bright yellow or greenish- 

 yellow atoms ; a submarginal serrate band as on the upper surface, 

 sometimes almost obsolete; no distinct discal bar as in the allied 

 species: expanse 1.75— 1. 00 inches. 



Female, differs in being much darker; grayish triaugles of priinarieji^'i 'nT} 



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