CONTENTS. 



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vii 



ARTICLE I. Monographs of the Diptera of North America. Pre- 

 pared for the Smithsonian Institution. By H. Loew. 

 Part I. Edited, with additions, by R. Ostensacken. 

 April, 1SG2. Pp. 246, 3 wood-cuts and two plates. 



(141) 



ARTICLE II. Monographs of the Diptera of North America. Pre- 

 pared for the Smithsonian Institution. By H. Loew. 

 Part II. Edited by R. Ostensacken. January, 1SG4. 

 Pp. 372, and five plates. (171 ) 



ARTICLE III. List of the Coleoptera of North America. Pre- 

 pared for the Smithsonian Institution. By John L. 

 Leconte, M.D. Parti. March, 1863— April, I860. 

 Pp. 82. (140) 



ARTICLE IV. New Species of North American Coleoptera. Pre- 

 pared for the Smithsonian Institution. By John L. 

 Lecoktb, M. D. March, 1863— April, 1866. Pp. 180. 



(167) 



