Se P t.,i 9 o 5 .] Dvar: Hksi'kriid.e of the United States. 123 



i. Right side piece with an outward projection at right angles; both tips spinose.. 2. 

 Right side piece without any outward projection, the lobe basal or subbasal and 



more or less parallel to the body of the clasp 3- 



2. Middle projection of left side piece longer than wide and basally curved, ap- 

 proximated to the clasp brizo, somnus. ' 



This projection wider than long, short, truncate icelus. 



3 Left side piece with no central projection ; projection of right side piece unusually 



basal, remote, conic martialis. ■ 



Left side piece with a central projection; projection of right piece less basal 

 approximate "*' 



4. Basal lobe of left side piece slender, longer than wide persius, lucilius. 



This lobe broad, square, the inner angle sometimes produced 5- 



5. Projection of right side piece very broad and truncate 7- 



This part moderate, band-shaped, curved toward base °- 



6. Middle lobe of left side piece with spiny inner angle and short outward point. 



juvenalis. ■ 



This lobe with a long distinct concave outer point afranius. 



7. Tip of right piece long produced, finger-shaped 8 - 



Tip of right piece shortly produced, truncate 9- 



8. Basal lobe of right side piece concave on the side propertms. 



This lobe convex on the side and roundedly curved down tibullus, lilius. * 



Basal lobe of right side piece well hollowed at the margin ; middle point of left 



side piece smooth horatius. . 



Basal lobe of right side piece scarcely hollowed ; middle lobe of left side piece 



10. 



spinose 



Basal lobe of right side piece slightly concave within ; tips square and joined to 



the side piece terentius, nzevius. 



This lobe convex within with a narrow tip funeralis. 



This lobe with a double pointed tip next to the the terminal lobe tristis. « 



Subfamily Pamphilin.e. 



SECTION A. 



Key to the Genera. 



I. Posterior tibire with one pair of spurs Pamphila. 



Posterior tibia; with two pairs of spurs Dalla. 



Genus PAMPHILA Fabricius. 

 P. palsmon Pallas. 



This European species occurs throughout the North from Maine 

 to British Columbia and the mountains of California. 



Genus DALLA Mabille. 

 I have gathered three species from the genera Butleria, Pholisora 

 and Pyrgus where they were formerly associated. Mabille has 

 restricted Butleria to Chilean species and erects a new genus, Dalla, 



9- 



10 



