Mar., 1922 alaskan dipteka of the family syrphid^ 147 



Female: Front shinino; black to the base of the antennee, black 

 pilose, with an irregular pollinose band reaching from eye to_ eye above 

 the antennae, this pollinose band is briefly interrupted at its middle. 

 The yellow on each side of the face unites around the upper end of the 

 black middle part and sends a projection up between the antennae. 

 Thorax shining black, scutellum dark brown; wing hyaline, stigma 

 opaque black, space between first and second veins slightly infuscated 

 back to the wing base; legs partly black, outer half of front and middle- 

 femora and apex of hind femur light brown; all tibiae in large part 

 brown, tarsi dark, nearly black. 



Male: Very near to the female in size and coloration. The hind legs 

 are more extensively black in this sex and the pilosity of the eyes is 

 more pronounced. 



Type in the Ohio State University Collection. 



This species is somewhat like creper and paiixillus. It is 

 larger than either and differs in having a much more extensive 

 black marking on the face. The abdominal markings on the 

 third and fourth segments extend over the lateral margins in 

 which respect it agrees with venustus of Europe. 



Sericomyia cynocephaJa n. sp. 



Female: Face much produced, so that the distance from the base 

 of the antennae to the apex of the facial production is nearly twice the 

 distance from the base of the antennae to the vertex. Face uniformly 

 yellow, lacking the black stripe commonly present in other members of 

 the genus ; cheeks from the anterior comer of the eye to the apex of the 

 facial production shining black; front black, sparsely gray pollinose 

 and black pilose; antenna black, third segment about as wide as long 

 and very slightly reddish at base, arista black and long plumose; 

 posterior orbits yellowish pilose. Thorax black in ground color, scu- 

 tellum pale brown, whole thorax yellowish pilose; wing hyaline, veins 

 mostly pale, stigma .yellow, squamae pale with a pale fringe, ballancers 

 yellow; legs black, tips of femora, less pronounced on the hind pair, 

 and bases of tibiae yellow. Ground color of abdomen above and below 

 black, segments two, three, and four above each with a pair of oblique 

 elongate yellow spots. All of these spots are widened outwardly and 

 none of them reach any of the margins of their respective segments; 

 spots on the second segment widely interrupted, those on the other 

 segments more narrowly interrupted. Length 14 millimeters. 



Female type collected by V. Stefansson at Barrow, Alaska, 

 spring of 1912. Type in the American Museum of Natural 

 History. 



This species is distinct from all the species of Sericomyia 

 known to me by the extreme production of the face and the 

 absence of the black facial stripe. In the other species of the 

 genus^I^have^^ studied the facial tubercle is pronounced, but in 

 cynocephalathis tubercle is only feebly indicated. 



