140 ILLINOIS BIOLOGICAL MONOGRAPHS [458 



SWAMMERDAM, J. 



1737. Biblia naturae, etc. Leydae. 

 SWENK, M. R 



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 Salix and its occupants. 

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

 Walden, B. H. 



1912. A new sawfly pest of the blackberry, Pamphilius dentatus MacGillivray. 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 modem 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. 



