Ko. 1488. BUTTERFLIES OF BRITISH AMERICA— GARY. 433 



Preble took another specimen of alladri on the north bank of the 

 Mackenzie River, opposite the moutli of the North Nahanni River, 

 July 25, 1904. 



There appear to be but two previous records for this region. 

 Edwards mentions the occurrence of al/'asla as far east as Ruperfs 

 House, on the eastern shore of James Bay;" wJiile Doctor Fletcher 

 records a specimen taken at Fort McPherson. Jun(> 21, I.SSS, by 

 AVilliam Ooilvie of the Canadian Geological Surve}'.'' 



This l)uttertiy is chiefly a mountain form. It is common in Alaska, 

 and proba})ly also occurs in fair numbers throughout the mountain 

 ranges west of the Mackenzie River. The Rupert's House specimen 

 recorded by P^dwards points at least to the probable occurrence of 

 allaska in the region between Hudson Ba}^ and the Rock}^ Mountains. 



PONTIA SISYMBRII (Boisduval). 



A single specimen in beautiful condition was secured at FortChipe- 

 wyan, June 4, 1903. A number of others were fl3'ing about the mossy 

 Archaean roci\s near the lake shore. It was a balmy spring day, and 

 insect life was l)eginning to be astir in that northern latitude. Bees 

 of the genus Osmia were common at the llow(;rs of the bearberr}^ 

 {ArctoHtaphylos uva-ursi)^ and two or three species of Bomhus were 

 darting about the rocks. 



Several butterflies of the genvis Poidhi which were seen flying across 

 the Athaliaska River 40 miles l)elow Fort McMurray, May 29, may 

 have been slsijnihr!!. Others noted on the Slave River, near Smith 

 Landing, June 9, probabl}^ l)elonged to this species. 



The Fort Chipewyan specimen extends the known range of P. sisym- 

 hr/'l far to the northward. 



PONTIA NAPI var. OLERACEA (Harris). 



Occurs alnnidantly throughout the region. This form was first noted 

 on the Smith Portage, June 12, 1903, but had apparent!}' been flj'ing 

 for some days. It was very numerous in open, grassy situations at 

 Fort Resolution a week later. Numbers of these butterflies were 

 collected. 



White records a species of Pontia which Richardson collected at 

 Fort Simpson.'" This reference may have been either to a specimen 

 of P. ohracea or P. occidentalis. Unfortunately the specimen cannot 

 now be traced, and in all probability has been lost. Scudder, in his 

 work on the Butterflies of New England, gives the following northern 



«Rept. Nat. Hist. Collections in Alaska, Pt. 4, 1887, p. 327. 



6 Ann. Rept. Can. Geol. Snrv., Ill (new sen), Pt. 1, App. IV, (1889), p. 230 B. 



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



