REVISION OF NEAECTIC TERMITES. 205 



1917. Thompson, C. B. Origin of the castes of tlie common termite Loucotermes 



flavipes Kol. Journ. Morphology, vol. 30, No. 1, Dec. (Proves that the 

 so-called "undifferentiated" nymphs are structurally differentiated, the fer- 

 tile and sterile types being predetermined at the time of hatching; suggested 

 terms adults first, second, and third forms, respectively, for the forms with 

 ■wings or wing pads, and those with no wing pads, instead of the present 

 heterogeneous nomenclature.) 



1918. Banks, N. The termites of Panama and British Guiana. Bull. Amer. Mus. 



Nat. Hist., vol. 38, Art. 17, pp. 659-67. New York, Nov, 29. 

 1918. Beebe, W. Jungle Peace. New York. (Termites are immune to attack by 



army ants in the Tropics.) 

 1918. Berger, E. W. Termite Injury to Sweet Potatoes. Quanerly Bull. State 



Plant Board of Florida, vol. 2, no. 4. pp. 190-1, fig. 89. July, Gainesville, 

 1918. Brown, W. H. The Fungi Cultivated by Termites in the Vicinity of Manila 



and Los Baiios. Philippine Journ. Sci. C. Botany, vol. 13, no. 4, pp. 223-231, 



pis. 3 and 4. July. (Bibliographical references.) 

 1918. Caudell, a. N. Zorotypus hubbardi, A New Species of the Order Zoraptera 



from the U. S. Canadian Entomologist, vol. 50, no. 11, pp. 375-81. Nov. 

 1918. Cleland, J. B. The Food of Australian Birds. Dept. Agric. New So. Wales, 



Science Bull. no. 15, July. (p. 15, Species of birds feeding on white ants.) 

 1918. CoMSTOCK, J. M. The wings of insects. Ithaca, N. Y. (chap. 8, pp. 132-144. 



The wings of Isoptera — Mastoterm.es, Termopsis, and Leucotermes favipes.) 

 1918. Dobson, R. J. A European termite Reticulitermes lucifugus Rossi in the 



vicinity of Boston. "Psyche," vol. 25, No. 5, Oct., 1918. 

 1918. Hopkins, A. D. Periodical events and natural law as guides to agricultura 



research and practice. Monthly Weather Review Supplement No. 9, Weather 



Bureau, no. 643, U. S. Dept. of Agric, May 1. 



1918. Wheeler, W. M. A study of some ant larvae, with a consideration of the 



origin and meaning of the social habit among insects. Proc. Amer. Philos. 

 Soc, vol. 57, no. 4, pp. 293-343, Phila. (Trophallaxis — i. e., "exchange of 

 nourishment" — originally developed as a mutual trophic relation between the 

 mother insect and her larval brood, has expanded with the gi'owth of the 

 colony like an ever-widening vortex till it involves, first, all the adults as 

 well as the brood and therefore the entire colony; second, a great number of 

 species of alien insects that have managed to get a foothold in the nest as 

 scavengers, praedators, or parasites (symphily); third, alien social insects — 

 i. e., other species of ants (social parasitism); fourth, alien insects that live 

 outside the nest and are "milked" by the ants (trophobiosis) ; and, fifth, 

 certain plants which are visited or sometimes partly inhabited by the ants 

 (phytophily). Trophallaxis is the source of the social habit in wasps and 

 termites as well as in ants.) 



1919. Banks, N. Antillean Isoptera. Bull. Mus. Compar. Zool., Harvard Col., vol. 



62, no. 10, pp. 475-489. 

 1919. Bradley, J. C. An Entomological Cross-Section of the U. S. pts. 1 and 2. The 



Science Monthly, vol. 8, nos. 4 and 5. April to May. (Localities where 



Prof. Wheeler collected termites described.) 

 1919. Crampton, G. C. Notes on the Phylogeny of the Orthoptera. Ent. News, 



vol. 30, no. 2, pp. 42-48, Feb. No. 3, pp. 64-72, March. (Refers to Isoptera 



and Zoraptera.) 

 1919. Snyder, T. E. Some Significant Modifications in Nearctic Termites. Proc. 



Ent. Soc, Wash., vol. 21, no. 5, pp. 97-104, May. 

 1919a. Snyder, T. E. White Ants as Pests in the United States and Methods of 

 Preventing their Damage. Farmers' Bull. 1037, U. S. Dept. Agric June. 



