TYPE SPECIES OF THE GENERA OF ICHNEIBION FLIES. 



By Henry L. Viereck. 



Of the Bureau of Entomology, United States Department of Agriculture. 



The following is an alphabetic catalogue of tlie genera of the Ichneu- 

 monoidea, together with the type of each genus. Unless otherwise 

 stated the original description of every genus has been consulted. 

 The catalogue is presumed to be complete up to the end of 1912. 

 The writer will be gratified to have his attention called to any omis- 

 sions that may be noticed by his colleagues. 



Latreille was the first author to give the fixation of genotypes any 

 attention in the Ichneumonoidea. Curtis next took up the matter 

 and decided upon types of additional genera. In 1840 Westwood 

 did the same thing, as it was in this year that he designated certain 

 species as being "Typical" of their respective genera and indicated 

 that in doing this he was following Latreille's example. Following 

 these authors we have Brull6 fixing the type for a few genera, then 

 Foerster and latterly Ashmead and others, the writers since Foerster 

 confining themselves chiefly to fixing the types of their own genera. 



In spite of all the fixations and the many genera originally based 

 upon a single species, monobasic genera, numerous recently erected 

 genera were still found without an indicated type and in some 

 cases it was discovered that untenable genotypes had been chosen 

 necessitating their retirement and calling for the substitution of the 

 legitimate species. 



Where the genus was based on a single species the wortl monobasic, 

 in parentheses, is added after the genotype; where the type has been 

 fixed in the past the author of such fixation, together wdth the time 

 and place of the act, is similarly given \dthin parentheses. Where 

 no species was originally included the first species to be placed in a 

 given genus has been adopted as the genotype, or if several species 

 were simultaneously assigned to such genus and no type had been 

 selected one of the series of the simultaneously included species is 

 chosen as the type species. This is indicated by giving two references 

 and by treating the genotype in the same way as in other genera. 

 In each case where a genus had no originally included species the 

 reference to the inclusion of the first species is given in addition to 

 the reference to the original description of the genus concerned, 



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