54 c Canadian Arctic Expedition, 1913-18 



Melanostoma Schiner. 

 There are at least two species referable to this genus in the collection. 



Melanostoma trichopus Thomson. 



Syrphus trichopus Thomson, Kongl. Svensk. Fregatten Eugenics Resa Pmk., 1868. 

 Jordan's Diptera, p. 502. 



Four specimens agree with the description of this species, which was originally 

 described from California and has since been recorded by Coquillett from Alaska. 



Locality: Bernard harbour, Northwest Territories, July 10 and 18-19, and 

 August 16, 1915 (F. Johansen.) 



Melanostoma, sp. 



A female differs from the preceding species in having the hind tarsi with the 

 apical four joints much flattened and in being larger — 8-5 mm. in length. 



Locality: Herschel island, Yukon Territory, July 29, 1916 (F. Johansen). 



Melanostoma, sp. 



One male and one female, taken at Bernard harbour along with trichopus, 

 differ from that species in being slightly smaller, 4-5 mm. in length, in having the 

 long hairs absent on the fore and mid tibiae and fore metatarsi, and the hind 

 metatarsi less swollen in both sexes. The head of the male is missing, and that 

 of the female is so much crushed that it is impossible to tell what the profile is 

 like. 



Locality: Bernard harbour, Dolphin and Union strait, Northwest Territories, 

 July 15, 1915 (F. Johansen). 



Scaeva Fabricius. 



Scaeva pyrastri Linne. 



Musca pyrastri Linne. Syst. Nat., Ed. 10, p. 549, 1758. 



This European species seems to be generally distributed througho t the 

 northwestern and western portions of this continent. It is represented in the 

 present collection by two specimens from Barter island, Alaska, June 10, 1914 

 (D. Jenness). 



Sphaerophoria cylindrica Say. 



Syrphus cylindricus Say, Am. Ent., vol. 1, pi. 11, 1824. 



A single male specimen from Herschel island, Yukon Territory, Canadian 

 Arctic coast, August 13, 1914, differs from the normal North American form in 

 the much darker abdomen and legs, the former having the second, third, and 

 fourth segments each with a narrow, centrally interrupted yellow band, and the 

 fifth segment with two small dorsal spots. Structurally the specimen differs not 

 at all from specimens taken in Illinois and other parts of the United States and 

 Canada. 



Syrphus sodalis Williston. 



Syrphus sodalis Williston, Synop. N.Am. Syrphidse, p. 741, 1886. 



This species was originally described from Colorado. There are three 

 specimens in the present collection, one from Collinson point, Alaska, June 17, 

 1914, and two taken west of Kongenevik, Camden bay, Alaska, June 27, 1914 

 (F. Johansen). 



The specimens agree in all particulars with the original description except 

 that the third antennal joint is not distinctly reddish at base in the two last- 

 mentioned examples. 



