INTRODUCTION. ' 43 



Since the publication of my Catalogue, etc., a Limnobia nigri- 

 cola Walk, has been described in the Trans. Loud. Entom. Soc. 

 V, K S. pt. YII, p. 66. It is apparently my Gnophomyia 

 luctuosa. 



The result of the foregoing examination is the following : — 

 Omitting the six species of the genus Trichocera, which requires 

 an entire revision, eleven species, among the thirty-two which have 

 been described, have not been identified ; of these six or seven, 

 because they have not been among the number of species which 

 I have had for examination : Limnophila carbonaria Macq. ; 

 Gynoplistia annulata Westw. ; Ehypholophus fascipennis Zett. ; 

 Limnobia gracilis Wied. ; Ptychoptera quadrifasciata Say and 

 metallica Walk. ; Chionea scita Walker may perhaps be added 

 to the number. The four remaining species (L. humeralis Say, 

 biterminata, ignobilis, and turpis Walker) have not been iden- 

 tified on account of the insufficiency of the descriptions. 



