875.] 189 [Osten Sacken. 



b. Abdominal spots coarctate in the middle, some- 

 times broken in two; a large, conspicuous black 

 spot in the middle of the face. 



7. S. amalopis n, sp. 

 II. Eyes bare; abdominal spots lunate. 



8. S. lapponieus. 

 C. Abdomen elongated, narrow, linear. 



I. First crossband interrupted, the others entire. 



9. S. diversipes. 

 II. All crossbands interrupted. 



lO. S. geniculates. 



1. §L torvus n. sp. 



Syrphus topiarius Zetterstedt, Schiner, Bonsdorf, Malm, etc. (non 

 Meigen). 



Female. Face and cheeks yellow, with a very slight bluish reflec- 

 tion ; a faint grayish spot on the cheeks, under the eyes; oral edge, 

 in the middle of the notch, usually slightly brown. Front and ver- 

 tex greenish black ; the former, on both sides along the eyes, with a 

 broad border of yellowish pollen, almost meeting the similar border 

 of the opposite side. Eyes pubescent (in many specimens the pu- 

 bescence is very much rubbed off, and very difficult to perceive). 

 Antennas inserted on brownish yellow ground; the dark color of the 

 front begins immediately above their root, forming a blackish brown 

 arch, with a projecting angle in the middle. Antennas dark brown; 

 third antennal joint more or less reddish below, sometimes altogether 

 dark brown. Thorax greenish, with but little lustre; in well pre- 

 served specimens a faint tinge of a geminate, grayish, middle stripe 

 is perceptible anteriorly; scutellum dull yellowish, with a slight blu- 

 ish reflection and black pile. Yellow spots on the second abdominal 

 segment elliptical, prolonged usually as a narrow neck, which reaches 

 forward and touches the margin ; the yellow crossbands on the third 

 and fourth segments have a very gently biconvex hind margin, with 

 a very shallow, often indistinct, sinus in its middle; on each side the 

 crossbands are attenuated and curved forward, so as to reach the 

 anterior margin of the segment; the black interval between the 

 stripes is twice as broad as the stripes. Fourth and fifth segments 

 with yellow posterior margins, the fifth usually with two yellow spots 

 on each side, at the base. Coxas and basal third of femora black ; 

 on the hind pair the black reaches beyond the middle of the femora ; 



