igoo] Harrington — Fauna Ottawaensis. 127 



178, and in the various summary reports of work carried on by the 

 writer during- the seasons of 1896-7-8-9, issued by the Geol. 

 Survey. 



The writer desires to emphasize the fact that he has done his 

 utmost to search for evidence in support of the Devonian age of 

 the strata in question. He has failed to do so except in the case 

 of the strata constituting the Knoydart formation — a term used to 

 designate the red shales, sandstones, marls and impure calcareous 

 beds such as are developed in McArras Brook, Knoydart Brook, 

 etc., and coloured Upper Devonian on the map prepared by the 

 Geological Survey Department — in which remains of Pieraspis, 

 Cephalaspis, Pterygotus and Onchus — examined by Dr. Henry 

 Woodward and Mr. Arthur Smith Woodward, of London, Eng- 

 land, and pronounced by them (as palasontological evidence 

 warrants) as belonging to the base of the Old Red Sandstone 

 type of the Devonian, and very similar in faunal as well as 

 lithological character to strata of Devonian age in Herefordshire, 

 England, and in Spitzbergen, as has been pointed out to the 

 writer by these gentlemen. 



Ottawa, 3rd Sept.. 1900. 



FAUNA OTTAWAENSIS. 



DiPTERA. 



By \V. Hagi'e Harrington, F.R.S.C. 

 The publication of the following list of some Ottawa Diptera 

 has been made possible through the courtesy of Dr. L. O. Howard, 

 the Chief of the Division of Entomology in the Department of 

 Agriculture, Washington, U.S. By his kind permission the deter- 

 minations of the species were made by Mr. D. W. Coquillett, an 

 eminent specialist and authority in this order. The specimens 

 submitted to him had gradually accumulated in my cabinets, but 

 they were taken only as " extras," during the collecting ot 

 Coleoptera and Hymenoptera. The list is, therefore, only a frag- 

 mentary contribution toward a knowledge of the Ottawa fauna, 

 and is presented with the hope that at some future time others 



