BUTTERFLIES OF THE DISTRICT OF COLUMBIA 141 



Seasons. — The gray hairstreak appears about the last of April, 

 and becomes frequent early in May. There are probably three 

 broods, but the insect seems to be continually on the wing from the 

 time of its first appearance until the end of the season. My dates 

 of capture are May 3, 9, 23, 30, and 31; June 6 and IT; July 17; 

 August 1, 3, and 27 ; and September 7, 12, and 19. 



STRYMON ONTARIO ONTARIO (Edwards) 



Ontario Hairstee:ak 

 Plate 23, Figures 7, 8 



Occurrence. — Ernest Shoemaker captured two specimens of this 

 rare little butterfly at Difficult Kun, Fairfax County, Va., on June 

 26, 1920. They were feeding on the flowers of Jersey-tea {Ceanothus 

 ameHcanus) . 



Dr. William T. M. Forbes writes me that he regards Edwards's 

 Thecla Ontario as the northern form of T. autolycus. The specimen 

 figured on the plate, the origin of which is not known, was determined 

 by Mr. Scudder as T. autolycus. It possibly came from the vicinity 

 of Boston, as a number of specimens recorded from that region can 

 not now be located. 



STRYMON TITUS MOPSUS (Hubner) 



CoRAX Haibstkeak 

 Plate 24, Figures 1, 2 



Occurrence. — Rare. Mr. Shoemaker has a specimen taken at 

 Glencarlyn, Arlington County, Va., on the flowers of Jersey-tea 

 {Ceanothus ajn-eHcanus) June 24, 1913, and I have a pair taken on 

 the flats below Chain Bridge on the flowers of milkweed (Asclepias 

 syriaca) June 30, 1923, and a female taken at Cabin John August 1, 

 1926. 



Remarks. — This insect is single brooded and passes the winter in 

 the egg. 



Notes. — The specimens from the District (pi. 24, figs. 1, 2) differ 

 from others at hand from localities near Boston (pi. 24, figs. 3-6) 

 in having the small dark spots on the undersurface of the wings 

 conspicuously bordered with white, and in having the submarginal 

 red spots on the undersurface of the hind wings smaller and therefore 

 more widely separated. The submarginal red spots on the under- 

 surface of the fore wings, which are conspicuous in northern females 

 and present, though much reduced, in northern males, are wholly 

 lacking, though the black chevron inwardly bordered with white 

 just within these spots is retained. 



