130 The Ottawa Naturalist. [October 



Therioplectes lasiophthalmus, Macq. One of our commonest species of 



Horse-fly. 

 Therioplectes septentrionalis, Loew. Rare. 

 Therioplectes affinis, Kirby. One example oi this larg^er form. 



Laphria pubescens, Will. Not very abundant. 



Laphria sericea, Say. A common and rapacious insect. 



Laphria gfilva, Linn. Almost as abundant. 



Laphria canis, Will. Common, 



Dasyllis flavicollis, Say. Abundant. 



Dasyllis posticata, Say. Not so common. 



Dasyllis sacrator, Walk. A large and abundant species. 



Dasyllis grossa, Fabr. The largest of our Bumble-bee mimics. 



Leptogaster testaceus, Loew. This slender species is common in June. 



Cyrtopogon chrysopogon, Loew. Also common. 



Nusa fulvicauda, Say. One specimen. 



Asilus notatus, Wied. Not common. 



Asilus annulipes, Macq. Abundant. 



Asilus novascoliae, Macq. Rare. 



Asilus callidus, Will. One specimen. 



BOMBYLIID.li:. 



Anthrax tegminipennis, Say. Our largest Bee-fly; not common. 



Anthrax fulviana, Say. Abundant in midsummer. 



Anthrax alternata, Say. One specimen. 



Anthrax lateralis, Say. Not common. 



Argyramoeba analis, Say. Our commonest species. 



Argyramceba oedipus, Fabr. One specimen of this pretty fly, 30th July. 



Bombylius major, Linn. One taken i8th May. 



SystcEchus vulgaris, Loew. Common but difficult to capture. 



Therevid^. 

 Psilocephala hremorrhoidalis, Macq. Several in June and July. 

 Psilocephala munda, Loew. One specimen i8th May. 



ACROCERID.^. 



Pterodontia flavipes, Gray. U. S. Nat. Mus. 

 Opsebius pterodontinus, O. S. U. S. Nat. Mus. 

 Oncodes costatus, Loew. V. S. Nat. Mus. 



Empidid^. 



Syneches rufus, Loew. Abundant. 

 Empis varipes, Loew. U. S. Nat. Mus. 

 Empis otiosa, Coq. Two specimens. 

 Rhamphomyia rustica, Loew. Two specimens. 

 Rhamphomyia pulla, Loew. Two specimens. 



