1916] Johnson — Some New England Syrphidce 79 



and middle femora and bases of the tibiae yellowish, the remainder 

 of the tibiae and the tarsi brownish. Wings infuscated. Length, 

 7 mm. 



9 . A specimen taken at the same time and place as the male 

 described above has the front and middle legs brown with the tips 

 of the femora and bases of the tibiae yellow, posterior legs black 

 with the bases of the femora and tibiae yellow, the yellow of the 

 antennae covering a large portion of the third and part of the second 

 joint, the spots on the second segment of the abdomen very 

 small, those on the second and third dull yellow and the triangular 

 outline poorly defined. Wings equally dark as the male but this 

 does not hold true in all of the specimens referable to this form. 



Twenty-two specimens. Holotype and allotype, Halfway House 

 (4,000 feet), Mt. Washington, July 6, 1914. Specimens were also 

 collected near the Glen House, on the carriage road at about 3,000 

 feet, and in Tuckerman's Ravine. A specimen was also taken by 

 Mrs. Slosson at the summit. The latter specimen was in the 

 U. S. National Museum and was kindly loaned to me by Mr. 

 F. Knab. It was marked " Melano stoma n. sp." in Mr. Coquil- 

 lett's handwriting. Types and ten paratypes in the collection 

 of the Boston Society of Natural History. Other paratypes in the 

 Museum of Comparative Zoology, U. S. National Museum, Acad- 

 emy of Natural Sciences, and the author's collection. 



Two of the paratypes (cf, 9 ) in the Society's collection are 

 melanic or without abdominal spots. The specimens from the 

 Glen House referable to M. mellinum are slightly smaller with wings 

 and legs somewhat darker than in the typical form. They seem 

 somewhat intermediate in character, but I have not sufficient 

 material to prove this; whether these mountain forms will prove 

 to be only extreme variations or subspecies of the common mellinum 

 remains to be seen. In any event names are necessary to avoid 

 confusion. 



A female specimen, a shiny, dark blue form, was also found at 

 the Halfway House, July 6, 1914. With the limited material, I can- 

 not separate it from Melanostoma coticimium Snow. 



Merodon equestris Fabr. 



Specimens of this species from both eastern and western Mass- 

 achusetts would seem to indicate that the species was established. 



