80 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



the segmeut ; 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. Coxob 

 and basal third of femora black ; on the hind i)air the black reaches be- 

 yond the middle of the femora ; hind tibifc often with a brownish ring; 

 four anterior tarsi brown, the root of the first joint often reddish ; hind 

 tarsi dark brown. Koot of the wing-s, as far as the humeral cross-vein, 

 slightly brownish, or yellowish ; costal cell almost hyaline; stigma brown. 



"Male. Similar to the female, but abdominal cross-bands broader, 

 the biconvexity on their hind side stronger, and the sinus in the middle 

 deeper ; the gray spot on the cheeks, under the eye, often larger, some- 

 times occupying a considerable portion of the cheek ; the brown ring on 

 the hind tibiee usually expanded, so as to reach the tip of the tibiae. 

 The eyes are more distinctly pubescent; the front is beset with yellow 

 pollen, except a narrow black space above the antennae. 



" In drawing up the description, I had a large number of specimens be. 

 fore me. Among them was a lot of twenty-three males and thirty-five 

 females, caught by Mr. B. P. Mann, on the 7th of July, 1874, almost on 

 the same spot, in the subalpine regions of Mount Washington. Another 

 lot of twenty-seven males and twenty females was collected by Mr. Mor- 

 rison, also in the White Mountains. Other specimens were from Mass- 

 achusetts, Rhode Island, Canada, the Rocky Mountains in Colorado, 

 etc." — Osteu Sacken, 1. c. 



From an examination of a large series of this species collected in the 

 White Mountains in company with numerous individuals of S. ribesii 

 (July 25-30), with others from various localities in the East, the Middle 

 States, Washington Territory, etc., I find nothing worthy of addition to 

 the above full description. 



Syrphus Lesueurii. (Plate IV, fig. 2.) 



.S^r/;7iMS Zes«eMrii Macqiiart, Dipt. Exot., ii,2,92 (female); Osteu Sacken, Proo. 



Bost.Soc. Nat. Hist., xviii, 143. 

 Epistrophe conjungena Walker, Dipt. Saunders., 242 ; tab. vi, fig. 5 (male). 



Habitat. — New England, Washington Territory ! 



"5,9. Length, 12 to 13™"». Larger than ;S^. torvus and with a much 

 narrower abdomen ; in the female the abdomen is a little broader, still 

 less broad than in the allied species. The yellow face has a brown, ab- 

 breviated stripe in the middle (sometimes wanting) ; the antennae are 

 uniformly black. Eyes bare. The yellow spots and cross-bands on the 

 abdomen are straight, and reach the sides of the abdomen with their 

 full width ; the yellow has a bluish reflection (seldom indistinct) ; in the 

 male the band on the third segment has a sharp triangular notch in the 

 middle of the hind margin, which does not exist in the female; fourth 

 and fifth segments often have a greenish reflection, and are margined 

 with yellow posteriorly. The femora are black at the base, the hind 

 tibiae have a distinct brown ring. The wings usually have a distinct 

 yellowish tinge. 



