76 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



Syrphus diversipes. • 



Syrplnis diversipes Macquart, Dipt. Exot., 4* Suppl., 155, 54; Osteu Sacken, 



Proc. Bost. Soc. Nat. Hist., xviii, 149, 1875. 

 T Syrphus cinctellus Zetterstedt, Dipt. Scand., ii, 742, 45. 



Habitat. — White Mountains, New Hampshire, New York, Washing- 

 ton Territory!, Lake Superior (O. S.), New Foundland (Macq.). 



5 , 9 . Length, i)"'"'. "Abdomen narrow, with nearly i)arallel sidesj 

 first segment ( $ ) greenisli bhick, with more or less yellow anteriorly, or 

 on the sides; in the female the yellow prevails, leaving only a metallic 

 green spot on each side, which often is suliobsolete ; the following four 

 segments have each a yellow cross-band on their anterior half ; the first 

 cross-band is broadly interrupted ; in the male the interruption takes 

 the shape of an inverted black triangle, exi)anding anteriorly so as to 

 occupy nearly the whole anterior margin of the segment; in the female 

 this triangle is narrow, and occupies but a small portion of the anterior 

 margin ; thus in the female the yellow of the cross-band coalesces with 

 that upon the first segment ; the following cross-bands are entire, the 

 second and third nearly of the same breadth and not attenuated on the 

 sides ; the fourth band in the male occupies nearly the whole segment, 

 exce[)t a black semicircle posteriorly; in the female it occupies the an- 

 terior half of the segment, and is gently arched, and distinctly notched 

 posteriorly. Face yellowish, with a bluish reflection, sometimes brown- 

 ish in the middle; above the antennae a couspicnous black spot is sur- 

 rounded by the yellowish pollen, which covers the rest of the front ; an- 

 tennae reddish, npper half of the third joint, as well as of the preceding 

 ones brown. Eyes bare. Thorax metallic green ; scutellum yellowish, 

 ■with a metallic green reflection ; humeri and a i)art of the pleurae 

 clothed with yellowish pollen. Lejis yellow; outer half of the hind 

 femora (sometimes nearly the whole hind femora, except the base), hind 

 tibiae and tarsi brown ; knees yellowish. Wings with a brownish shade 

 on the apex, usually distinct in the female, often nearly obsolete in the 

 male. 



Ten male and thirty female specimens. Two male specimens have 

 the four anterior femora distinctly infuscated at the base. 



8. cinctellus Zetterstedt, is very like this species and probably identi- 

 cal with it. His description agrees with the North American speci- 

 mens. A European specimen in the Museum of Comparative Zoology, 

 named by Dr. Loew, does not show any difference wortii noticing." — 

 Osten Sacken, 1. c. 



Two male and sixteen female s]>ecimens from the White Mountains, 

 New Hampshire (Jackson, July 25), agree fully with this description ; 

 a single female from the same locality lias, however, the first and sec- 

 ond abdominal segments as in the male. A single female from Wash- 

 ington Territory agrees throughout. My female si)ecimens have a 

 peculiarity, not noticed by Baron Osten Sacken, wherein they dift'er 



