1924] Diagnoses of Some Diptera Occurring in New England 227 
d', Great Falls Va., June 22: 9 , Lawrence, Kans., June 18, 
(Curran); 9, N. J.; cf, Washington, Mass.; cf. Bar Harbor, 
Maine, (Johnson), and those mentioned in detailed description. 
Microdon ocellaris new species. 
Hind basitarsi not unusually swollen. Eyes with sparse, 
microscopic hairs (rarely extremely difficult to see) ; color metal- 
lic dark green, densely punctured, the reflection not vivid; pile 
of head whitish to pale yellowish; of body yellowish, or greyish 
white; third antennal joint shorter than the first; ocellar triangle 
much broader than long; vertex considerably swollen; apex of 
scutellum with widely separated, strong spines, much as in 
tristis. Length 12 to 15 mm. 
9 Linglestown, Pa., June 14, (Champlain); S', I^yme, 
Conn., Aug. 30, 1911, (Champlain); d', Lyme, June 1, 1918; 
2d, Linglestown, June 3, 1919; d, Lyme, April 30, 1911, (all 
Champlain); 29, Darien, Conn., June 12, 1915, (Johnson); 
2 9, Newton, Mass., May; d, Framingham, Alass., (Frost). 
Microdon manitobensis new species. 
Eyes bare; hind basitarsi not unusually swollen; first an- 
tennal joint as long as the following two; ocellar triangle a little 
wider than long; head and thorax yellow pilose, the latter 
usually Avith more than the posterior half bright tawny pilose, 
the scuttellum almost invariably so; spines of scutellum small, 
moderately separated. Length, 11 to 13 mm. Nearest cothur- 
natus but more robust, the tawny pile on scutellum and struc- 
tural characters distinguishing it. 
Fifteen specimens of both sexes, Megantic, Que., June, 
(Curran); Capens, Me., July 15, Oquossoc, Me., July 2 and 
Soutlwest Harbor, Me., June 22, (Johnson); 26^2 9, Elmboro, 
Sask., (Jewsbury); 2d^, Ottawa, Ont., June, (Curran); several 
specimens, Manitoba, (Hunter). Not rare about large ant hills. 
