ECOLOGY OF ISLE ROYALE. 311 



with the front part of the basal half clouded with fnscons, but other- 

 wise hyaline. The species is near the size of nivosus and appears 

 much like that species. Type locality Hudson Bay Region, but at the 

 present time known from Alaska and various parts of the British Pos- 

 sessions. Specimens from Isle Eoyale have the white spots on the 

 sides of the abdomen larger than in some specimens I have observed. 



12. Tabanus insuetus Osten Sacken. A single specimen taken by 

 B. F. Savery August 9, (V, •"')• This is the only species known from the 

 western states, with the hairy eyes and ocelligerous tubercle absent and 

 therefore falls in the genus Atylotus of some authors. Type locality 

 Weber Lake, California. Now known from Alaska, British Columbia 

 and several of the noi'thwestern states. 



13. Tahanus astutiis Osten Sacken. (?) Several specimens taken at 

 Light-house clearing (I, 7) July 2C) and 28, and (V, 3) August 7 and 

 15, by B. F. Savery. These specimens come nearer agreeing Avith astutus 

 than any other species I know, but there are some points in which they 

 do not agree and for that reason I have named them astutus with a 

 question. Walker described a number of species from the far north that 

 have never been identified since. It is therefore with much interest that 

 I receive such collections as the present. Although a number of species 

 have a wide north and south distribution in boreal regions every col- 

 lection from the north is apt to contain something of interest. 



Family Bonibiliidae. 



14. Anthratr morio Linn. Two specimens taken at Light-house clear- 

 ing (I, 7), July 11 and 26. Anthrax seminigra and morw are be- 

 lieved to be synonyms. The species is common to. Europe and North 

 America and is distributed in the latter country from Maine to British 

 Columbia. Nearly the basal two-thirds of the wing is black, the re- 

 mainder hyaline. The outer margin of the black is irregular and begins 

 on the costa near the apex and proceeds obliquely, gradually nearing 

 the base. 



15. Anthrax fulviana Say. A single specimen taken July 26, (IIT, 

 3). The whole body of this insect is clothed with dei^se yellow pile, 

 the legs are black and the wings hyaline with costal margin and narrow, 

 base black. Type locality Pembina, Minnesota, and besides it has been 

 taken in New Mexico, Washington and British Columbia. 



Family Therevidae. 



16. Thereva frontalis Say. Two specimens taken at Light-house 

 clearing (I, 7) July 29, and (V, 3) August 9. Type locality Northwest 

 Territory and specimens are at hand from Montreal, Colorado and Brit- 

 ish Columbia. The Isle Eoyale specimens are rather larger in size than 

 other specimens I have seen but agree closely in coloration with Colo- 

 rado examples. Those at hand from British Columbia are slightly more 

 brownish, but the thoracic and abdominal markings are of the same 

 form and extent in all. 



