1850 RIPJRT OF THE CHIEF OF ENGINEERS. 



Genus PARNASSIUS Latr. 



Parnassius Delias var. Sminthcus. 



Parnassius Delius var. Smintheus, Doubleday <fc Hewitson, Genera of Diurnal Lepidoptera, 



t. 4 (1847).— Edwards (W. H.),Butt, N". Am. i, t. 2-4, Parnassius (1872). 

 Parnassius Sayii, Edwards ("W. H.), Proc. Ent. Soc. Phil, ii, p. 78 (1863). 



Three, two males and one female, ou July 4, at the waterfall on San Juan River, not 

 far below Camp 32. Two of these were of the ordinary form, but one male was remark- 

 ably aberrant in that the secondaries were entirely destitute of the usual red spots on 

 both surfaces. This remarkable example I have figured on one of the plates which ac- 

 companies this report. 



This species is found along the Rocky Mountains of North America generally, find in 

 the Old World in the Swiss Alps and Ural and Altai regions. The American lepi- 

 ■dopterists have made the most strenuous efforts to prove this a distinct species from the 

 European forms, but the futility of such efforts are palpably shown by comparing the 

 Altai [from Intermedins Men. with our Colorado examples, so close are the two that 

 no examination, however critical, can discover any difference that would allow specific 

 separation. 



Xeo2)hasia Mcnapia. 



Family PIEEID^E. 

 Genus NEOPHASIA Behr. 



Neophasia mcnapia, Felder, (Pieris M.), "Wiener Entomologische Monatschrift, iii, p. 271 

 1859) ; ReiseNov., Lep. ii, p. 181, t. 25 (1865).— Edwards (W. H.), Butt. 3s\ Am. i, 1. 1, Pieris d 

 (1871).— Strecker, Lepidoptera Rhop. Het. i, p. 14, t, 2, f. 4? (1873). 



Pieris Tau, Scudder, Proc. Bost. Soc. Nat. Hist, viii, p. 183 (1861). — Morris, Syn. Lep. 1ST. Am. 

 p. 322 (1862). 



Pieris Ninonia, Bdl., Lep. Cal. in Ann. Soc. Ent. Belgique, xii, p. 38 (1869). 



Several of both sexes taken August 11, at the Rio Florida Colorado. 



This species was only seen in the southwestern corner of Colorado, toward New Mex- 

 ico and Arizona ; it is the most beautiful and delicate looking of all our Pieridce, and 

 in ornamentation approximates to some Malayan groups. It is found in Utah, Ari- 

 zona, California, Oregon, and Vancouver's Island. 



Mr. Henry Edwards discovered the Chrysalis attached to the trunks of pine-trees in 

 Vancouver's Island ; the larva is as yet unknown, but it doubtless, as Mr. Edwards sug- 

 gests, feeds on some species of pines. 



The male was first figured in Dr. Felder's great work, the Lepidoptera of the Reise 

 der Novara ; subsequently three figures, all males, though curiously given as male and 

 female, were represented in Mr. W. H. Edwards's Butt, of N. Am. ; the only figures of 

 the female are those by myself in the Lepidoptera Rhop.-Het. (1873). 



Genus PIERIS Schrk. 

 Pieris Napi. 



Pieris Napi, Lixx. (Papilio N.), S.vstema Naturffi, ed. x, 1, p. 468, u. 60 (1758) ; ert. xii, 1, 2, p. 



760. n. 77 (1767); Eaun. Suec. p. 271 (1761).— Strecker, Lepidoptera Ithop.-Het. 1, t. 8, p. 61 



(1873). 

 Pieris Venosa, Scudder, Proc. Bost. Soc. Nat. Hist, viii, p. 182 (1861).— Morris, Syn. p. 320 



(1862). 

 Pieris Nasturtii, Bdl., Lep. Cal. in Ann. Soc. Ent. Belgique, p. 38 (1869). 



Common along Weeminuche Creek to Rio Piedro, on San Juan River to Pagosa 

 Springs, in the Rio Navajo Valley, at upper part of the river, at Park, in the canon of 

 the Upper Rio de los Pinos, and at other points along the route, from July 18 to Au- 

 gust 28. 



This is a species having an immense range, being found in Labrador, British Co- 

 lumbia, Colorado, Utah, &c, California, Oregon, Alaska, Japan, Siberia, and all over 

 Europe (? ex Reg. Pol.). It is subject to many variations, among which are Oleracea 

 Harris, Frigida Scudder, Hulda W. H. Edwards, and Pallida Scudder. Owing to the 

 little attention paid by American entomologists to the fauna of other countries, this 

 insect was supposed to be distinct from the European species until I established their 

 identity in 1873.* 



Pieris Napi var. Pallida. 



Pieris Napi var. Pallida. Scudder, Proceedings Boston Soc. Nat. History, viii, p. 183 (1861). — 

 Morris, Syn. Lep. X. Am. p. 321 (1862).— Strecker, Lepidoptera Knop.-Het. p. 62, t. 8 

 (1873). 



Pieris Iberidis, Bdl., Lep. Cal. in Ann. Soc. Ent. Belgique, xii. p. 39 (1869). 



Pieris Castoria, Eeakirt, Proc. Acad. Nat. Sci. Phila. p. 238 (1866). 



Pieris Eesedce, Bdl., Lep. Cal. in Ann. Soc. Ent. Belgique, xii, p. 39 (1869). 



* Lepidoptera Rkopaloceres and Heteroceres, I, p. 61-63, 1873. 



