( 550 ) 



probably overlooked this fact when he advanced the hypothesis that the variable 

 Colorado insect was the product of a cross between a black (southern) species, 

 P. bain/i, and a yellow (northern) species, P. oregonia. A parallel case is P. chjtia 

 of the Oriental Region. The variability of P. poh/xencs is also similar to that of 

 /'. bain/i, that species being strongly di- or trichromatic in Mexico, Guatemala, and 

 South America, practically monomorphic (apart from occasional aberrations) in the 

 other districts of the range. 



For early stages see Edwards, /..:•. (1807). 



Ilab. Arizona and New Me.xico (Jii7e Mead) northwards, the yellow form 

 extending to Uaunda (Regina) and British Columbia (Kootenay Mts.), the black 

 form not being known so far north (or is it represented by P. nitra ?). 



In the Triug Museum 20 c?c?, 3 ¥ ?, from: Glenwood Springs, Colorado, 

 June 1901 (Oslar); Thumb Bntte, June 1901 (Oslar) ; Garfield Co.; Beaver, Utah, 

 July ; Wickenbnrg, Arizona, May 1898 (Dr. Kunze) ; Ozoyoos, British Columbia 

 (Reynolds). 



62. Papilio nitra Edw. (1883). 



Papilio nilm Edwards, Papilio iii. p. 158. 162 (1883) (Judith Mti., Montana) ; Fletcher, Camd. Ent. 

 xix. p. 22.i (1887) (Rocky Mts. ; Regina, N.W.T.) ; id., Repl. Ent. Soc. Ontario xviii. p. 25 

 (1888) (Regina, N.W.T. ; Rocky Mts.); Edw., Bull. N. .imei: iii. Pap. t. 1. (J? (1880) 

 (Canmore, June, on the summit ; Regina ; Montana, July) ; Mayn., .Man. N. Amer. Bull. p. (5. 

 D. 7 (ISiO) (Montana) ; Christ, MittSrhweiz. Ent. Ges. ix. p. 27.S (1807) ; Holland, Bull. Bool: 

 p. 312. n. 11. t. 41. fig. 2. (J (1809); Dod, Catiad. Eiil.x%xm. p. 171. n. 80 (1901) (Alberta, 

 June) ; Baird, Jiepl. Ent. Soc. Ontario xxxiii. p. 93 (1903) (High River, Alta). 



Papilio intira nitra, Dyar, Bull. U.S. JVat. Mm. Iii. p. 3. n. 20a (1902). 



This insect resembles P. bairdi f. bairdi, but is shorter winged. It is restricted 

 to Montana and Western Canada, and is said to occur there together with 

 P. zelicaon and P. bairdi f. oregonia. We believe these oregonia to be the 

 yellow form of nitra. We have not seen Canadian oregonia, but have two females 

 from Ozoyoos, British Columbia. These females are shorter winged than our 

 Colorado specimens and than Edwards's figures of Oregon individuals, and have 

 the abdominal margin of the hindwing more extended black. (Janadian oregonia 

 may be similar to these Ozoyoos specimens, which would render it probable that 

 there is really such a connection between the black and the yellow Canadian 

 specimens as here suggested. Breeding will decide the question. P. indra is 

 qnite distinct from nitra. 



The sexes are similar, the yellow markings being rather paler in the female 

 than in the male (they are too pale in Edwards's figure). The size of the 

 markings is variable, also the extent and intensity of orange on the underside of 

 the hindwing. 



Early stages and food-plant not known. 



Hab. West Canada ; Montana. 



In the Tring Museum 4 c?^, 1 ?, from: Red Deer, Allicrta, June 1003; 

 Didsbury, Alberta, Jnne 1904. 



63. Papilio zelicaon Lucas (1852). 



Papilio zelicaon Lucas, in Gui'r., Rev. Zool. (2). iv. p. 13G (1852) (California); Doubl., Wcstw. & Hew.^ 

 Gen. Diurn. Lep. ii. p. 520 (1852) ; Gray, Cat. Lcp. Ins. Brit. Muk. i. Pap. p. 37. n. 182 (1852) 

 (Calif.) ; id., List Lep. Ins. Brit. ihis. i. Pap. p. 51. n. 190 (185G); Lucas, Bull. Soc. Ent. France 

 p. G7 (185(>) (distinct from rnachaon) ; Felder, Verh. Zool. Dot. Ges. Wien xiv. p. 315. n. 358 

 (1804) (California ;— " Labrador ; Missuri ? " .ad aliam spec, refer.). 



Papilio zolicaon (!) ISoisduval, Ann. Soc. Ent. France p. 281. n. 3 (1852) (California) ; Vollenh., 



