INTRODUCTION. 43 



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

 cola Walk, has been described iu the Trans. Loud. Entom. Hoc. 

 Y, N. 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 IVichocera, which recjuires 

 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 annul ata Westw. ; Bhypholophus fascipennis Zett. ; 

 Limnobia gracilis Wied. ; PtycJioptera quadrifasciata Say and 

 ■vietallica Walk. ; Chionea sella Walker may perhaps be added 

 to the number. The four remaining species {L. hiimeralis Say, 

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

 tified on account of the insufiiciency of the descriptions. 



