TABLE OF CONTENTS. 



PAGE 



Gen. XXXVII. Ula . . 274 



1. elegans, n. sp. f . 276 



2. paupera 0. S. %.^ . 277 



Gen. XXXVIII. Dicranota . 278 



1. rivularis 0. S. %.^ . 281 



2. eucera, n. sp. -J . . 281 



Gen. XXXIX. Plectromyia . 282 



1. modesta, n. sp. "^ . 9 . 284 



Gen. XL. Rhaphidolabis . 284 



1. tenuipes, n. sp. '^ . 9 • 287 



2. flaveola, n. sp. -^ . 9 . 288 



Sect. VII. CYLINDROTOMINA 289 



Gen. XLI. Ctlindkotoma . 296 



1. americana 0. S. % . 299 



2. nodicornis 0. S. %.'$ . 301 



Gen. XLII. Triogma . 

 1. exsculpta 0. S. J 



PAQB 



303 

 304 



Gen. XLIII. Phalaceocera . 305 

 1. tipulina 0. S. % . 307 



Sect. VIII. PTYCHOPTERINA 309 



Gen. XLIV, Pttchoptera . 309 

 1. rufocincta O.S.%.'$. 313 



Gen. XLV. Bittacomorpha . 313 

 1. clavipes Fab. %.^ .315 



Gen. XLVI. Protoplasa . 316 

 1. fitchii 0. S. . .319 



APPENDIX I. 



Species described by previous authors and not contained in the 



present Monograph. 321 



Say, Journal of the Academy of 



Nat. Sciences in Philad. 321 

 Limnobia humeralis . 321 



Say, Long^s Expedition, etc. ; 



Appendix . . . 321 



Ptychoptera 4-fasciata . 321 



Trichocera scutellata . 322 



Wiedemann's Aussereuropaiscke 



Zweifiugelige Insecten . 322 



Limnobia gracilis . . 322 



A. Fitch, Winter Insects of East- 

 ern Neio York . . 323 

 Trichocera brumalis . 323 



Macquart, Diptires Exotiques, etc. 323 



Limnophila carbonaria . 323 



Walker, List of Specimens of the 



British Museum, etc. . 324 



Ptychoptera metallica . 324 



Chionea aspera . . 325 



scita . . . 325 



Trichocera bimacula . 325 



gracilis . . 325 



Walker, Diptera Saundersiana . 326 



Limnobia turpis . . 326 



biterminata . 327 



ignobilis . , 327 



Zetterstedt, Diptera Scandina- 



vice, etc. . . . 328 



Erioptera fascipennis . 328 



Westwood, London and Edin- 

 burgh Philos. Magaz. . 329 

 Gynoplistia annulata . 329 



