312 MICHIGAN SURVE3Y, 1908. 



Family Asilidae. 



17. Cyrtopogon chrpsopogon Loew. Taken at Light-house clearing 

 (I, 7), July 6 and 10. Type locality Massachusetts. Known from 

 Montreal, Quebec, New Jersey, New York and Florida. This record ex- 

 tends the westward range of the species considerably. It is black with 

 the beard straw-yellow and the bases of all the tibiae red. 



18. Dasyllis astur Osten Sacken. Taken at Light-house clearing (I, 

 7), July 7. The two specimens that I include under this name do not 

 fully agree with the original description of the species but are nearer 

 it than to posticata, and as Osten Sacken indicates certain variations in 

 his description the specimens are given this name. In typical astur 

 from British Columbia the pile on the anterior dorsum of the thorax 

 is largely black and that on the tibiae yellow. In the Isle Eoyale speci- 

 mens the pile on the anterior dorsum of the thorax is all yellow and 

 that on the tibiae is black. Osten SackSn observed that specimens of 

 astur taken at low altitudes had the pile on the tibiae black, and as the 

 size agrees I believe it proper to place the specimens in this way. Type 

 locality California, but otherwise known from Oregon, Washington and 

 British Columbia. 



19. Asilus annulatus Williston. Three specimens taken August 5 

 (V, 3). Known from northeastern North America, as far west as Kan- 

 sas. The specimens appear to be typical for the species. 



Family DoUchopodidae. 



20. HydropJiorus philonvbrius Wheeler. A number of specimens 

 taken July 11 (I, 1). I suspect there are plenty of species of this 

 family in the Isle Royale locality but this is the only one included in 

 the collection sent for study. The type locality is Milwaukee County, 

 Wisconsin, and it is also recorded from Texas. These specimens are 

 typical, agreeing in detail with the original description and figure. 



Family SyrpMdue. 



21. Ghrysotoxum ventrioosum Loew. Specimens taken July 7, at 

 Light-house clearing (I, 7). The family Syrphklae is a most attractive 

 family of flies and the genus to which this species belongs is one of its 

 finest groups. The various species are mostly found in northern regions 

 or at high altitudes, and are easily recognized by the oblique yellow 

 abdominal markings and elongate antennae. This one is the largest 

 American species of the genus and was first described from specimens 

 taken in the District of Columbia. It is now known from New Jersey, 

 Canada and Arizona. 



22. Pyropliaena granditarsus Forster. A female specimen taken 

 July 28, at Light-house clearing (I, 7). This is the same species that 

 formerly passed under the specific name ocymL It is common to Europe 

 and North America and in the latter country is distributed from New 

 England to British Columbia. The two sexes are very different in 

 appearance and to some extent in structure, and it is from the front 

 tarsi of the male that its specific name is derived. 



23. Platychirus peltatus Meigen. Taken July 25, (II, 1). Common 



