100 BULLETIN 108, UNITED STATES NATIONAL MUSEUM. 



There may be several swarms from one colony, distributed over a 

 period of several weeks. The first outdoor flight of R. Jiavipes 

 KoUar in the vicinity of Washington, District of Columbia (and, as 

 mentioned above, the first swarm contains the greatest number of 

 individuals), occurs simultaneously with the ripening of the pollen 

 of the eastern flowering dogwood (Oornus florida), which is also 

 influenced by seasonal and geographical variations. 



R. virginicus Banks does not swarm outdoors, in the vicinity of 

 the city of Washington, until after the mountain laurel (Kalmia lati- 

 folia) and the chinquapin (Castanea pumila) are in full bloom, usually 

 a full month later thoji Jiavipes. 



R. Jiageni Bante swarms, in the vicinity of Washington, District of 

 Columbia, about two months later than virginicus. 



Reticulitermes Jiesperus Banks swarmed in the San Bernardino 

 Mountains, California (near Little Bear Lake) in 1917 on June 1. 

 The dogwood (Comus nuttallii) then had flowers with ripe pollen. 



J. Brunner states that sexual adults of Termopsis nevadensis 

 Hagen were first observed in flight near lights, near Missoula, Mon- 

 tana, when the pollen began to fall from the yellow pine (by June 15, 

 1916). 



Dr. A. D. Hopkins, since 1895 (Hopkins, 1918) has made extensive 

 observations in phenology, noting the correlation between the 

 seasonal development of plants and insects. He states that the 

 variation due to latitude, longitude, and altitude from a date at 

 Washington, District of Columbia, will be approximately four days 

 for each degree of latitude, 5° of longitude, and 400 feet of altitude, 

 being earlier in the season southward, westward, and descending. 

 Therefore, the swarm would be over relatively earlier at parts south 

 of Washington and westward and later northward. Washington is 

 at approximately latitude 39° and longitude 77°, and practically at 

 sea level. 



In buildings infested by termites the time of swarming is greatly 

 influenced by the artificial heat, and the swarm from indoor infested 

 timbers may occur one or two months earlier than under natural 

 conditions. 



Colonies of the same species of Reticulitermes may swarm at different 

 periods of the year; as, R. Jiavipes Kollar usually swarms in the 

 spring, yet winged adults were collected by the junior author on 

 November 3, 1915, at Meldrim, near Savannah, Georgia, and in No- 

 vember, 1917, by E. B. Griffen in telephone poles; and at Bergen 

 Beach, New York, September 14, 1908. R. claripennis Banks swarms 

 in both the spring and the fall in Texas. R. tibialis Banks in Kansas 

 swarms in September and in both fall and winter in Texas. At Colo- 

 rado Springs, Colorado, this species swarmed the first part of April 

 in 1915; in 1917 winged adults were collected on September 9 by W. 

 D. Edmonston. 



