82 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



at tbe extreme base only) ; the bind femora are altogether yellow, thas 

 dififeriug- widely from those of the male. 



Three male and six female specimens, nil from Massachusetts. 



A pair (5,9) of European specimens obtained from Dr. Schiner are 

 exactly similar to the American yi|)ecimens; they also show all the 

 sexual differences, as explained above. Zetterstedt's description agrees 

 very well with my female specimens. In my report on the Dipteraof 

 Colorado Territory (U. S. Geol. and Geogr. Surv., etc., by F. Y. Hayden, 

 for 1873, p. 5G4), I* mentioned S. corollcc as occurring there. I was mis- 

 taken in this determination ; the specimen is more like S. abbreviotus, 

 although I would not without further i)roof identify it even with this 

 species." — Osten Sacken, 1. c. 



Four male specimens from Connecticut and Massachusetts agree 

 throughout with the above full description; the second abdominal band 

 in one does, however, distinctly attain the lateral margin of the segment 

 in front. I have a male and a female specimen of S. coroUce, received 

 from Mr. F. M. v. d. Wulp, the male of Avhich does not show any differ- 

 ence that I can see from my specimens of 8. abbreviatus. 



Syrphus Americanus. 



Syrphus J»ienca««« Wiedemann, Auss. Zw. Ins., ii, 129, 22; Osten Sacken, Proc. 

 Bost. Soc. Nat. Hist., sviii, 145. 



Rabitat. — ISTew England, Montana!, British Possessions, New York, 

 Delaware, Yirginia, Michigan, Texas. 



3,9. Length, 9 to 10""™. "Female. Face yellow, often brownish, 

 with a broicn stripe in the middle, which begins at the oral margin, but 

 does not reach the antennaj; the latter brown, reddish on the underside 

 of the third joint. Cheeks blackish; biit separated from the niovth by a 

 narroic yellow border, which, on the underside of the mouth comjdetely 

 cuts off" the connection between the black color on both sides. Front 

 brownish bronze color, powdered with yellow on each side ; the lower 

 part of the front is more or less yellow, but immediately above each 

 antenna there is a brownish spot, which sometimes coalesces with the 

 bronze color of the upper front; vertex bronze color. Eyes bare. The 

 first abdominal cross-band is not interruj^ted, but coarctate in the mid- 

 dle; its ends do not touch the margin of the abdomen, but are separated 

 from it by a narrow black border; (sometimes a brownish mark in the 

 middle of this band gives it the appearance of being subinterrupted). 

 The second cross-band is nearly as broad as the black cross band be- 

 tween it and the next yellow band; it is usually perfectly straight (in 

 some specimens the hind margin is gently sinuate ) ; its ends do not 

 touch the lateral margin of the abdomen ; they are cut obliquely, form- 

 ing a sharp angle anteriorly, and a rounded one posteriorly ; the former 

 almost touches the margin of the abdomen. The third band is similar 

 to the second, only its hind margin is more perceptibly arcuated. The 

 posterior margin of the fourth segment has, as usual, a narrow yellow 

 border ; the fifth likewise, and two yellow spots at the base besides. 



