SYiS'OPSIS or NORTH AMERICAN SYRPHID^. 77 



from all the North American Syrphus known to me, viz, the fifth ab- 

 dominal segment is unnsnally long, more than half as long as the pre- 

 ceding, agreeing in this respect with Eupeodes. 



Syrphxis protritus. 



S)ir2)]nis proU-itus Osten Sacken, West. Dipt., 328. 



Habitat.— CaVii'onmi (O. S.) 



" S . Length, 10 to 12'"'". Eyes glabrous. Face yellow, with a bluish 

 opalescence ; on the cheeks a hirge blackish spot below the eye, and not 

 quite reaching the oral margin (it is variable in size, sometimes very 

 small ); the lower edge of tlie head behind the mouth and between the 

 lower ends of the eyes is again yellow. Antenna) red, sometimes faintly 

 brown on the upper side of the third joint; front brownish yellow above 

 the autennne, black, slightly pruinose, and with black pile in the corner, 

 between the eyes; vertex black, with black pile; occiput grayish, beset 

 with i)ale hairs. Thorax dark bronze green, beset with dense yellowish 

 pile. Scutelhim yellowish, with black pile, some yellowish hairs on each 

 side. Abdomen black, opaque, with three reddish yellow cross- bands, 

 the first of which is broadly interrupted; the two yellow spots thus 

 formed are prolonged along the lateral margin to the very base of the 

 abdomen; the second and third bands reach the lateral margin, being 

 only a little attenuated before it ; they are biconvex posteriorly, with an 

 angular emargination in the middle ; fourth segment with a yellow bor- 

 der posteriorly; the fifth red, with a black triangle in the middle. Legs 

 altogether reddish, often a brown shade in the middle of the hind tibiae 

 and on the hind tarsi, femora red from the very base ; coxse and trochan- 

 ters black. Wings subhyaline; their root tinged with brownish, the 

 costal cell with yellowish ; stigma brownish yellow, third vein nearly 

 straight. 



Four males. Is very like the common S. ribesii of the Atlantic States; 

 only in that species the male has black hind femora, the black spot 

 on the cheeks is smaller, and the antennae are much darker." — Osten 

 Sacken, 1. c. 



Syrphus ribesii. 



J/i(8ca?'itesuLiuDe, Fauna Suec, 1816(1781); Scbrank, Enum. Insect. Austr., 905. 

 Syrjihns ribesii Latreille, Gen. Crust., iv, 325; Fabricius, Spec. Insect., ii, 432, 57; 



Entom. Syst., iv, 304, 100; Meigen, Syst. Beschr., iii,306, 49; Walker, In8. 



Brit., i, 287, 4 ; Osten Sacken, Cat. Dipt., 123; Schiner, Verb. Z. B. Ges., 



vii, 340; Fauna Austr., i, 310. 

 Scceva ribesii Fabricius, Antl., 248, 1; Fallen, Syrpb., 40, 6; Zetterstedt, Dipt. 



Scand., ii, 707; ibid., viii, 3132. 

 Syrphns rectus Osten Sacken (non Novicki), Proc. Bost. Soc. Nat. Hist., xviii., 



140. 

 ? Sjjrjjhus 2}hiladelpliicus 'Maaqnart, Dipt. Exot., ii, 2,93, 11; tab., xvi, fig. 2. 



Habitat. — Europe, Atlantic, Middle, and Pacific States ! 

 9,S. Length, 7 to 12™™. "9. Eyes glabrous; hind femora yellow, 

 often with a brown ring before the tip. 



$ . Eyes glabrous ; hind femora black, except the tip. 



