XL VI AUTHORITIES. 



WIEDEMANN. C. R. W. - - Aussereuropaische Zweiflugelige Insecten. 2 



vols. Hamm 1828-30. With plates. 

 Diptera exotica. Kiliae 1821. 

 Analecta entomologica. Kiliae 1824. 

 Achias, dipterorum genus a Fabricio conditum. Kiliae 1830. 



Sphyracephala (Achias) brevicornis Say; described and figured. 

 Monographia generis Midanttn. (In the Nova acta Academiae 

 Naturae Curiosoruiu, vol XV. Bonn 1831. 4to. With three 

 plates.) 



Four new species from N. America. 

 ZETTERSTEDT, J. W. Insecta lappoiiica, descripta. 1 vol. in 4to. 



Lipsiae 183840. 



Diptera Scandinaviae disposita et descripta. 14 vols. Lundae 

 1842-1860. 



Both of these works contain many diptera common to Lapland 

 and the northern parts of the American continent. 



The Practical Entomologist. 



published by the Entomol. Soc. of Philadelphia. Vol 1 , 1865 66, 

 Vol. II, 1866 67. 



The American Entomologist, 



an illustrated Magazine of popular and practical Entomology, edited 

 by Benj. D. Walsh and Ch. V. Riley. St. Louis, Mo, Vol. I, 1868; 

 Vol. II (title changed to Amer. Entoni. and Botanist) 1870. 



The Canadian Entomologist, 



Volume I VII; 1869 1875. (Voll. I and II published in Toronto; 

 Voll. Ill VII in London, Out) 



The American Naturalist 



a monthly magazine of Natural History, published (until 1877} in 

 Salem, Mass. 



These periodicals have been quoted in the present volume for 

 the various notices and illustrations of N. -A. Diptera, which tluy 

 contain. 



