536 PROCEEDINGS OF THE NATIONAL MUSEUM vol. so 



depth. They were flying just high enough to miss the housetops and so on 

 down until you could even touch them. They were flying at a moderate speed 

 and some of them would pause a second to rest ; and when night came they would 

 all rest just where darkness caught them. They were so thick in places that 

 they seemed like a cloud passing. Some of them would dart in and out between 

 the houses. In their flight they followed the mountain valley. 



This unusual flight was the subject of much discussion locally at 

 the time. 



Driving from Washington to Alexandria, Va., along the main boule- 

 vard on September 22, 1934, 1 saw between 200 and 300 of these butter- 

 flies in the adjacent fields or crossing the road, flying singly or more 

 rarely in twos or threes, occasionally in larger groups, 6 to 15 or 20 feet 

 above ground. All were flying directly west. The light wind, as 

 determined from weather vanes in Alexandria, was east or slightly 

 north of east. Continuing from Alexandria to Accotink, I noticed 

 the same phenomenon; between 200 and 300 butterflies were seen, 

 ail flying west. On September 25, 1934, between 5 and 5:30 in the 

 afternoon on the road from Accotink to Alexandria a few butterflies 

 were noticed, flying west as before. 



Dr. Remington Kellogg has given me a note on a migratory flight 

 that he witnessed at Fishers Island, N. Y. Under date of September 

 19, 1921, he wrote that for the past two days large numbers, and at 

 times a steady procession, of large dragonflies were observed flying 

 across the island toward the southwest. Monarch butterflies {DaTurn.^ 

 jjlexippys) were frequently seen, though never in such large numbers 

 as the dragonflies. He noted that winds — that is, the prevailing 

 northwest wind — apparently have little to do with the migration of 

 the dragonflies and added that it is easy now to understand how it 

 is that dragonflies form such a large item in the stomach contents 

 of the pigeon hawks, which were migrating along the same route. 



DANAUS PLEXIPPUS MEGALIPPE (Hubner) 



PUiTE 71, FiGtJKE 2 



Euploea Megalippe Hubner, Index systematicus, No. 220, 1828. 



Ariosia Mefjalippe Hubnek, Sammlung exotischer Schmetterlinge, vol. 2, pi. 220 



(7),figs. 1,2, 1826. 

 Danals archippua form nigrippus Haensch, in Seitz, Die Gross-Schmetterlinge 



der Erde, vol. 5, p. 113, May 13, 1909. 



Range. — From Peru (Chanchamayo) northward to Mexico (Co- 

 lima) and eastward in northern South America to Venezuela (Aroa) 

 and British and French Guiana ; islands of St. Lucia and Dominica, 

 Lesser Antilles; Puerto Rico; Dominican Republic (Saman^) ; coast 

 of Texas; near New Orleans, La.; Key West, Fla. ; about Currituck 

 Sound, N. C. ; coast of Virginia south of Chesapeake Bay : casual in 

 Long Island. N. Y., and Decatur, Dl. 



