398. CAROLINE BURLING THOMPSON. 



long, with twelve antennal segments, and externally all alike, 

 are distinguishable, after staining, into worker nymphs with a 

 small vestigial frontal gland, and soldier nymphs with a large 

 frontal gland. 



7. The soldiers of Eutermes pilifrons, and also those of E. 

 morio and E. sanchezi, are therefore not externally differentiated 

 at the time of hatching, which, according to Bugnion, is the case 



in E. lacustris. 



WEI.LESLEY, MASS., 

 July, 1918. 



BIBLIOGRAPHY. 

 Bugnion, . 



'12 Eutermes lacustris nov. sp. de Ceylan. Revue Suisse de zoologie, vol. 20. 

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Rend. soc. biol. Paris, I., t. 72. 

 Grassi, B., and Sandias, A. 



'93-'94 Costituzione e sviluppo della societa dei Termitidi. Atti Acad. Gioenia 



di sci. nat., Catania. 



'96-'97 T^ie Constitution and Development of the Society of Termites; Obser- 

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 on the Embiidae, translated by T. H. Blandford. Quart. Jour. Micros. 

 Sci., vols. 39-40. 

 Knower, H. McE. 



'94 Origin of the "Nasutus" (soldier) of Eutermes. Johns Hopkins Univ. 



Bull., vol. 13, pp. 58-59. 

 Snyder, T. E. 



'15 Biology of the Termites of the Eastern United States with Preventive and 



Remedial Measures. U. S. Dept. Agr., Bur. Ent., Bull. no. 94- 

 Thompson. C. B. 

 '16 The Brain and the Frontal Gland of the Castes of the "White Ant," Leu- 



cotermes flam pes Kollar. Jour. Comp. Neurol., vol. 26. 



'17 Origin of the Castes of the Common Termite, Leucolermes flavipes Kol. 

 Jour. Morph., vol. 30. 



