252 THE CANADIAN ENTOMOLOGISt. 



In Conchology I consulted George W. Tryon's " Structural and 

 Systematic Conchology," 1882. In this a large part of the genera are 

 subdivided into subgenera and subgenus names are used. If space would 

 permit, a review of Mr. Tryon's course in regard to these names would 

 be interesting. 



In Hymenoptera I find Dr. A. S. Packard, " Revision of Fossorial 

 Hymenoptera," divides five genera into groups by capital letters ; pub- 

 lished in 1865. Dr. Henri de Saussure, "Synopsis of N. A. Wasps," 

 1875, divides genera into subgenera with subgenus names, in a few cases 

 dividing a subgenus into groups and using names for these groups also. 

 Edward Norton, "Cat. of the Tenthredinidee," 1867-69, uses names in 

 some genera and numbers in others. E. T. Cresson, in his various 

 publications, divides only a few genera, and part of those are divided with 

 names and the rest by numbers. 



In Diptera I find Osten Sacken, in his "Cat. of Diptera," 1878, 

 divides two genera into subgenera with names, the genus Trypeta into 

 thirty-seven, and Chlorops into six subgenera. I have other works on 

 Diptera, but they were not consulted. 



In Hemiptera, P. R. Uhler, " Check List of Hemiptera Heteroptera," 

 1885, no subgenus names used. The other works I had access to were 

 not consulted. 



In Coleoptera only Horn's and Henshaw's Check Lists were con- 

 sulted, and neither of these use any form of subdivision of genera. 



In Neuroptera, Dr. H. Hagen, "Synopsis of Neuroptera of N. A." 

 1861, divides a few genera by the use of subgenus names, others are divided 

 by reference marks as in analytical keys. 



In Lepidoptera I find P. A. J. Duponchel, "Cat. of the Lep. of 

 Southern Europe," 1844, divides large genera for analytical purposes, 

 sometimes using a capital letter. " Accentuated List of British Lep." 

 contains no division of genera ; published in 1858. Boisduval and Guenee, 

 "Species General," 1874, divide genera into groups by letters, numbers 

 and reference marks, but do not use names. Guenee in his part of the 

 work does the same thing. Grote, in his new " Check List of N. A. 

 Moths," divides Apatela and Agrotis into subgenera, using names. This 

 is the list of 1890. His lists of 1875 and 1882 contain some section 

 subdivisions, both with and without names. W. F. Kirby, in his " Cat. 



