140 ILLINOIS BIOLOGICAL MONOGRAPHS (458 



SWAMMERDAM, J. 



1737. Biblia naturae, etc. Leydae. 

 Swenk, M. H. 



1911. A new sawfly enemy of the bull pine in Nebraska. 24th Ann. Rept. Neb. Agr. 

 Exp. Sta., 1911. 



Townsend, H. T. 



1894. Notes on the Tenthredinid gall of Euura orbitalis on Saliz and its occupants. 

 Jour. N. Y. Ent. Soc., 2:102. 

 Walden, B. H. 



1912. A new sawfly pest of the blackberry, Pomphttius denkUus MacGfllivray. Rept. 

 Conn. Agr. Exp. Sta., 1912, 236-240. 



Walsh, B. D. 



1866. Imported insects; the gooseberry sawfly. Pract. Ent, 1:117-125. 

 Webster, F. M. 



1900. The purslane sawfly, Schizocerus zabriskei Ashm. Can. Ent., 32:51-54. 

 Westwood, J. O. 



1840. An introduction to the modern classification of insects. London. 

 Young, Chester. 



1898. The larvae of the Tenthredina. Baccalaureate thesis, Cornell University. 



1899. Descriptions of sawfly larvae. Can. Ent., 31:41-43. 

 Yuasa, H. 



1920. The anatomy of the head and mouth-parts of Orthoptera and Euplexoptera. Jour. 

 Morph., 33:251-307. 



