100 BULLETIN 15 7, U. S. NATIONAL MUSEUM 



accompanied by an alteration of the color pattern on both surfaces. 

 On the upper surface the black line which crosses the wing parallel 

 to the outer margin just within the submarginal row of black spots 

 is lacking, and the black spots, which are more or less elongated 

 inwardly, have moved to its position with a corresponding inward 

 extension of the markings between these spots and the outer margin. 

 On the underside the row of whitish spots that crosses the middle of 

 the wing parallel to the outer margin is omitted, except for the single 

 large spot on the anterior margin, and the other markings are cor- 

 respondingly extended basalward. 



A male with the black markings above fused (j)l. 7, fig. 8) was 

 taken at Silver Spring on July 7, 1928. 



PHYCIODES BATESII (Reakirt) 



Bates's Peabl Crescent 

 Plate 13, Figures 3, 4 



Occun^ence. — Rare. I have two specimens, both from Cabin John, 

 taken on May 17, 1925, and June 16, 1929. 



Remarks. — This species seems not to differ in habits from P. 

 tharos. 



Genus EUPHYDRYAS Scudder 



EUPHYDRYAS PHAETON PHAETON (Drury) 



BalMONY, ok TtTRTLEHEAD, BUTTERFLY 



Plate 11, Figures 7, 8 



OOGwrrence. — Very local; found in the swamps along the Eastern 

 Branch (Ernest Shoemaker) and in the swamps along the road from 

 the southern end of the Highway Bridge to Arlington, Va. (William 

 Schaus), as well as in the damp meadows between Conduit Road 

 and the canal 2 miles beyond Cabin John, Md., wherever the food 

 plant {CheJone glabra) is common. In the restricted localities 

 wherein it occurs it is always abundant. 



Habits. — There is a great difference in the habits of the tw^o sexes 

 of this butterfly, and apparently considerable di^^ersity between dif- 

 ferent individuals of the same sex. The smaller females are much 

 more active than the larger ones, and the larger males are less ac- 

 tive than the smaller. The large females I have never seen more 

 than about 20 feet from the food plant, but the smaller females occur 

 throughout the range of the males. 



Both sexes seem to shun the food plant, and the only individuals 

 I have seen on, or even very near it, were large females engaged in 

 depositing their eggs. 



