54 c Canadian Arctic Expsdition, 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 Eugenies Resa Pmk., 1868. 
Jordan's Diptera, p. 502. 
Four specimens agree with the description of this species, which was originall}^ 
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: Herschcl 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 LTnion 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 through o 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. Syrphidaj, 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. 
