434 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxi. 



records for oJeracea: ''Mackenzie river, at lat. 65° (Kirby);" Great 

 Slave Lake (Brit. Mus.); Atliabasea reoion (Geffcken).'"^ Doctor 

 Fletcher records 13 specimens which Frederick Bell collected at Fort 

 Simpson in June, 1888.^ 



P. oleracea is the comujon form in Athabaska and the southern por- 

 tions of Mackenzie,'^ l)eing replaced farther north by the form Imlda 

 Edwai'ds. 



PONTIA NAPI var. HULDA (Edwards). 



This is apparently the pre\ailing form in the region between the 

 sixty-fourth parallel and the Arctic coast. Mr. Preble secured a 

 goodly series in the summer of 1904 at the following localities in the 

 lower Mackenzie Basin: Fort Norman, June 13; Fort Good Hope, 

 June 21 to 23; Fort McPherson, July 6 to 8. 



Kir by described i^^o^iw/- cada from "three specimens taken in lat. 

 65° " (probably on the Mackenzie River).' The name of the collector 

 is not given, but the specimens were very probabh' collected by Doctor 

 Richardson, on Franklin's second expedition, in 1825-26. White, in 

 Richardson's narrative,-^ records Pontia casta Kirby from the "Arctic 

 Coast between 67^^ and 68°."^ The latter record is of specimens taken 

 on Richardson's third journey, in 1848-49. 



This butterfl}" has been recorded from Fort McPherson by Doctor 

 Fletcher,''^ specimens having been taken at that post by William 

 Ogilvie, June 21, 1888. A. G. Butler records specimens collected by 

 Miss Elizabeth Taylor at Fort IVIcPherson, July 15, 1892, and also at 

 the Rapids of the Drowned, Slave River, June 29 and 30, 1892.' 



PONTIA OCCIDENTALIS (Reakirt). 



This species appears to be unconmion, and occurs only in the moun- 

 tainous portions of Mackenzie. 1 captured a single example on the 

 Nahanni Mountains, July 16, 1903, at an altitude of 2,000 feet. In 

 1904, Mr. Preble took two specimens at Fort Good Hope, June 21 to 23. 



P. occidental! s has not been previously recorded from the region. 



« Probably the type of ^^ Pontia casta" Kirby. This specimen, which was formerly 

 in the British Museum, has been lost. A. G. Butler treated the name casta as a 

 synonym of Jiulda Edwards, and it seems best to thus consider it, as hulda is the 

 common form at that latitude. 



t' Butterflies of Eastern United States and Canada, II, 1889, p. 1197. 



cAnn. Kept. Can. Ceol. Surv., Ill (new ser.), Pt. 1, App. IV, 1889, p. 231 B. 



'^Strecker (Lepidoptera, Ehopaloceres and Heteroceres, 1872, p. 132), mentions 

 several examples of P. napi var. frigida, which he received from Geffcken. No defi- 

 nite locality is given, merely " between Hudson's Bay and Lake Athabasca." 



'' Fauna Boreali-Americana, IV, 1837, p. 288, fig. 3. 



/ Arctic Searching Expedition, II, 1851, p. 362. 



f/See Introduction, p. 428, footnote. 



/' Ann. Rept. Can. (ieol. Surv., Ill (new ser.), Pt. 1, App. IV, (1889), p. 230 B. 



i Annals Nat. Hist., (6), XII, 1893, p. 13. 



