SYKOPSIS OF NORTH AMERICAN SYRPHID^. 55 



Dent vertical triangle, the ocelli being situated further forward, by the 

 flattened abdomen, which is long oval in shape and more narrowed to- 

 wards its base, so that its greatest width is attained at the end of the 

 third segment ; the wings also are shorter and broader, scarcely pro- 

 jecting beyond the end of the abdomen. The tarsi of the male may be 

 either flattened or simple. Type of genus P. ocymi (Fabr.) Schiner, 



Our two species are also European, and the only known ones in the 

 genus. The genus, taxonomically, is equivalent to Melanostoma and 

 Platychirus combined. The flies are apparently rare j I have but two 

 specimens collected in this country. 



TABLE OF SPECIES. 



Abdoiueu largely reddish yellow ; front and middle tarsi of the male flattened. . ocymi. 

 Abdomen black, with two reddish yellow spots on the third segment ; front me- 

 tatarsi of male not flattened rosarum. 



Pyrophaena rosarum. 



Syrphus rosarum Fabricius, Mantissa Ins., ii, 341, 71 ; Entom. Syst. iv, 307, 109; 



Meigen, Syst. Beschr. iii, 338, 94; Panzer, Fauna, cviii, 14; Macquart, Hist. 



Nat. Dipt, i, 545, 39 ; Walker, Ins. Brit, i, 295, 30 ; Schiner, Verb. Z. B. Ges. 



vii, 357. 



Syrphus noctilucvs Panzer, Fauna, Ixxii, 24 (male). 



Scaeva rosarum Fabricius, Antl., 351, 11; Fallen, Syrph. 47, 22; Zetterstedt, 



Dipt. Scaud. ii, 755, and viii, 3152, 58. 

 Pyrophama rosarum Schiner, Wien. Ent. Monatschr., iv, 213; Fauna Austr. i, 

 298 ; Osten Sacken, Cat. Dipt., 122. 



Habitat. — Europe, North America (O. S.). 



^ , 9 . Length, 8 to 9™™. Antennse black, the third joint below 

 somewhat lighter colored. Face metallic blue, straight, the tubercle 

 little prominent. Thorax with two approximate whitish stripes. Ab- 

 domen velvet black, with the exception of two reddish yellow spots on 

 the third segment, and the last segment, shining. Legs black, yellow 

 at base of tibice. Wings tinged with ghayish, in the middle with a 

 darker spot. Thorax shining dark green; scutellum with a blue re- 

 flection. In the female the legs chiefly steel-blue j four front tibiae yel- 

 low or yellowish-brown, their tarsi almost wholly yellow. — Translation. 



I do not know this species. 



Pyiophaena ocymi. (Plate III, figs. 13, 13a, 136, 13c.) 



Syrphus ocymi Fabricius, Syst. Ent., iv, 309, 114; Panzer, Fauna, Ixxxii, 18; 



Meigen, Syst. Beschr. iii, 337, 93 (female); Macquart, Hist. Nat. Dijit., i, 



546, 40 ; Schiner, Verb. Z. B. Ges., vii, 362. 

 Syrjihus lobat'is Meigen, Syst. Beschr., iii, 336, 92 (male). 

 Scava ocymi Fabricius, Antl., 252, 18; Fallen, Syrph., 48, 23; Zetterstedt, Dipt. 



Scand., ii, 754, and viii, 3152, 57. 

 Syrjyhus granditarsus Walker, Ins. Brit., i, 295, 29. 

 Platycheirus ocymi Stseger, Kroj. Tidsskr., iv, 320. 

 Pyrophaina ocymi Schiner, Wien. Ent. Monatschr., iv, 213; Fauna Austr., i,297. 



Habitat. — Europe, North America ! 



S , 9 . Length, 8 to 9™™. Metallic black. Antennae brownish black, 

 third joint convex below, nearly rectangular at the end above. Face 



