MONOGRAM OF TIIE LABOULBENIACEyE. 



263 



In addition to the forms above enumerated, which include one hundred and fifty-two species 

 and twenty-eight genera, a certain number of undescribed form3 are known, including several 

 new genera. Of these, three species belong to the genus Laboulbcnia, two of them North Ameri- 

 can, on Blcdius and Anophthalmus, and one European, on Patrobus (Peyritsch) ; one to Cantharo- 

 myecs, on Ancyrophorus ; one to Chitonomyces, on an unknown host, together with a new genus, 

 on Bledius, and a doubtful genus on Tachinus. The total number of forms known to exist, 

 excluding certain doubtful species referred to by Peyritsch, is thus one hundred and fifty-eight. 1 ( 

 Although this number may be assumed to illustrate the group in a general way, it is certain 

 that many important additions are inevitable, and from the data available a rough estimate of 

 the numbers of the family existent in all parts of the world would be from five hundred to one 

 thousand. 



The following descriptions, a majority of which first appeared in the " Proceedings" of the 

 Academy, have been largely rewritten and revised with additional notes in the light of more 

 abundant material and a more complete knowledge of the group. As will be observed, a limited 

 number are here described for the first time, and include some of the most important additions 

 to the family. 



1 To these must be added a new aquatic genus near Chitonomyces, which is alluded to under that genus, and 

 two undescribed species of Ceratomyces. 



