344 S. H. SCUDDER ON THE SPECIES OF 



it bears,' as P. syloanoldes is to California. Tlie region in Colorado, explored by Mr. Mead, 

 is generally over seventy-five hundred feet above the sea ; potatoes, he informs me, will 

 grow at eight thousand, or perhaps eighty-five hundred feet, and at nine thousand feet no 

 vegetables can be raised. The lower table lands have an elevation of six thousand feet, so 

 that the species inhabiting tins region are all insects of high altitude. P. Jiiba, again, ex- 

 tends from the Great Salt Lake to California; within the limits of the United States, east 

 of the Rocky Mountains, only two species occur : P. Oiioe, west of the Mississippi, in the 

 Indian Territory, Kansas and Iowa ; and P. Sassacus, which spreads from the Great Plains 

 to the Atlantic, and along the seaboard from Maine to Georgia. 



For readier determination of these species I have added separate tables, drawn from the 

 markings of the wings and from the abdominal appendages. 



TABLE TO DETERMINE THE MALES OP THE SPECIES OF PAMPHILA ; DRAWN FROM THE ORNAMENTATION 



OF THE WINGS. 



1. Upper sui'flice of hind wing almost wliolly tawny, with a very narrow dusky or dark brown border 2. 



1. Upper surface of liiiid wings hirgely obscured with dusky, or with a \'ery broad dusky or dark brown 



border 3. 



2. More than 36 mm. in expanse; under surface of hind wings with scarcely any markings . Ottoe. 

 2. Less than 36 mm. in expanse ; under surface of liind wings distinctly marked with an irregular mesial 



band of partially connected spots Nevada. 



3. Discal dash of ui)per surfoce of fore wings followed, in the lower median and medio-subniedian inter- 

 spaces, by a narrow belt of blackish scales sylvanoides. 



3. Discal dash of upper surface of fore wings not followed by any row of dusky scales along its 



lower edge 4. 



4. Under surface of hind wings with an irregular mesial band composed of distinct large, squarish, 



nearly uiiifjrm spots Juba. 



4. Under surface ot liiml wings with a scarcely perceptible, irregular mesial band of nearly uniform 



spots Sassacus. 



4. Under surface of hind wings with an irregular mesial band, composed of distinct, small or rather 



small spots, seldom unifoi'm 5. 



5. Band crossing under surface of hind wings bent at an angle of about 50°, the band much constricted 



near the angle Colorado. 



5. Band crossing under surface of hind wings bent at an angle of about 60°-75°, the spots near the angle 



only a little, if any, smaller than the others 6. 



6. Each of the spots forming the mesial band of the under surface of the liiiid wings distinct, often 

 narrowly edged on the outer and inner edges with black, the ground of the wing almost always 



rather lieaxily flecked with dark green comma. 



6. The spots of the mesial band of the under surface of the hind wings confluent, or nearly so, 

 almost never and then but slightly edged with black, the ground of the wing but slightly 

 flecked with not very dark green Manitoba. 



TABLE TO DETERMINE THE FEMALES OP THE SPECIES OF PAMPHILA ; DRAWN FROM THE ORNAMENTATION 



OF THE WINGS. 



1. The paler markings of the under surfice of the wings white or silvery white, conspicuous ... .3. 



1. The paler markings of the under surface of the wings either inconspicuous, a little paler than the ground 



color of the wings, or altogether wanting 2. 



2. A large species, expanding more tlian 36 mm., destitute of markings beneath - Ottoe. 



2. A small species, expanding less than 36 mm., with inconspicuous markings beneath . Sassacus. 



1 Since writing this, it has been taken in Ai-izona. doubt tliat any markings it may have bcneatli will be as in- 



^ It is here assumed that tlie female of P. Ottoe, which is conspicuous as in P. Sassacus, and tliat it can be instantly 

 unknown, will resemble the male. Thei'c can scarcely be a distinguished from that by its much greater size. 



