• INTRODUCTION. 41 



12. Rhamphidia Jlacipes Macq. is described below under this 

 name. 



13. Limnohia gracilis Wied. is either a Limnophila or an 

 Amalopis, distinguished by its large size (7 lines) and its abdo- 

 men being much longer than the wings. The description of this 

 species is reproduced in the Appendix to this volume. 



14. Limnohia humeralis Say; a Limnophila. I would in- 

 cline to the opinion of AViedemann and consider this species 

 as synonymous with L. lenuipes Say, if in a copy of Wiedemann's 

 Avork at the Academy of Natural Sciences in Philadelphia I had 

 not found a marginal note, in Say's handwriting, positively deny- 

 ing this synonymy. Say describes only a female ; the venation 

 is the same as that of temiipes, and altogether the resemblance 

 of the two species must be very great. I reproduce the descrip- 

 tion of L. humeralis in the Appendix. 



15. Limnohia ignohilis Walk. (Dipt. Sanjid.) has the venation 

 like Meigen, Tab. YI, fig. 5, that is, a single submarginal cell ; 

 there is a stump of a vein near the origin of the prtefurca. I 

 know of no such species. The description will be reproduced 

 in the Appendix to this volume. 



16. Limnohia macrocera Say = Limnojjhila viacrocera (comp. 

 below). 



n. lAnmohia p)rominens Walk, is very probably Rhamphidia 

 Jiavipes Macq. 



18. Limnohia rivosa of Fabricius' Fauna Gi^oonlandica is 

 probably Pedicia alhivilta, which is indeed very like the European 

 Pedicia rivosa. 



19. Limnohia rostrata Say = Geranomyia rostrata (comp. 

 below). 



20. Limnohia simulans Walk. = Dicranomyia defunda 0. S. 

 I have seen the original at the British Museum, an old and faded 

 specimen. Mr. Walker describes the species as " pale yellow, 

 legs yellow, tips of thighs, of the shanks and of the feet black ;'' 

 whereas, in reality, the body is blackish, the legs are dark brown, 

 almost black, with a white band before the tip, etc. 



21. Limnohia tenuipes ^aj = Limnophila tenuipes (comp. 

 below). 



22. Limnohia turpis Walk. (Dipt. Saund.). Venation like 

 Meig. Tab. Y, fig. 5, that is, a single submarginal cell and five 

 posterior cells. All the known Limnohise with a single sub- 



