Tryon lleakirt on Coloradian Butterflies. 125 



In addition to the normal form, of very common occurrence, there 

 is a somewhat rarer variety, apparently intermediate between this type 

 and Rutulus, and of which, I give a short diagnosis. 



The fore wings differ from Turnus, in the formation of the yellow 

 sub-marginal spots, contained in the black border, — in that they are 

 larger, nearly all of equal size, and oblong; the black bauds are also 

 much narrower. 



The hind wings, in the obsolescence of the black, discal arc, 

 although this is hardly distinctive, since it is sometimes wanting in 

 types of the species; and in the presence of two tails, both exceed- 

 ingly slender, the outer but slightly spatulate, the inner acute, about 

 one-third the length of the exterior. 



Below, the yellow sub-marginal spots of the primaries are almost 

 coalescent, and the black border of the secondaries, is much more uni- 

 formly and thoroughly covered with shining blue atoms, than is usual 

 in types of the species. The yellowish underpart of the body is also 

 changed to a cinereous brown. 



This interesting variety is very much more delicate in structure, 



than any of a very great number of the typical form, with which I 



have compared it ; I have seen but two specimens. 



Papilio Rutulus, Boisd. 



.Mollis. Synopsis, p. 3, n. 3. (1S62.) 



Hah.— -Pike's Peak, Colorado Terr., Cala., (Coll. Tryon Reakirt.) 

 Pike's Peak, (Coll. Ent. Soc. Phil.) 



This seems to be more common in the mountains than either 

 Daunus or Turnus. As there is really but very slight differences be- 

 tween all three — it must probably have been mistaken for either of 

 these two — especially the latter, since I can find no previous record of 

 its occurrence there. 



The chief points of distinction amount to these : — between Daunus 

 and Turnus, the narrowness of the black bands upon the former as 

 compared with those of Turnus (not always, however, persistent in the 

 last) ; a continuous sub-marginal ray on the underside of the primaries. 

 instead of a row of oblong spots, and the presence of three tails in the 

 former, in place of one, or sometimes two, as we have just seen, in the 

 Litter; — Rutulus agrees with Daunus in having the continuous sub- 

 marginal ray, whose width, however is usually much less in the former; 

 differs in having but one tail, and in the greater breadth of the trans- 

 verse, black bauds: — Turnus agrees with Rutulus iu the width of the 

 transverse bands; differs sometimes in the number of tails, and always 

 in the sub-marginal line, this in Turnus being composed of distinct 



