INSDCUTOR INSCITI^ MKNSTRUUS 141 



joint slightly longer than broad; face entirely covered with 

 whitish pubescence; epistoma very slightly produced. Wings 

 smoky ; squamae white ; halteres reddish yellow. Length 9 mm. ; 

 wing 7 mm. 



Redescribed from sixteen specimens, eight males, eight 

 females. 



A rather common early spring species attracted to the swamp 

 marigold, Caltha palustris, in the swamps in the region about 

 Ithaca, New York. 



In a batch of material Mr. C. W. Johnson sent the writer 

 there is a series of specimens collected at Halfway House, 

 Mount Washington, June 13, 1916, and July 16, 1915, which 

 are so similar to the Nev/ York specimens that they are placed 

 with them. Also in Dr. Aldrich's collection there are two fe- 

 males collected by him at Lake Metigoche, Turtle Mountains, 

 North Dakota, June 30, 1918, which are quite inseparable 

 from orilliaensis. Thus this species appears to have a wide 

 northern range. It is rather closely related to C. baroni, which 

 may be distinguished from orilliaensis by its brown antennae. 



Chilosia burkei, new species. 



Male (allotype). — Deep blue species, clothed with black pile. 

 Eyes and face hairy. Head broadly oval in outline ; antennae 

 reddish brown ; arista long, about half again as long as width 

 of f rons ; face gently concave from antennae to rather promi- 

 nent tubercle. Thoracic pile rather long, longer and coarser on 

 scutellum, the downward projecting pile on the lower posterior 

 border blackish. Femora black, tibiae and tarsi brown; pile 

 on coxae white with black hairs intermixed. Basal corners of 

 tergites aeneous with li::^ht pile, posterior corners black with 

 brown pile. Wings slightly smoky ; squamae slightly tinged, 

 cilia darker ; halteres reddish yellow. Length 8.75 mm. ; wing 

 7.5 mm. 



female (type). — Frontal, facial and mesonotal pile black; 

 antennae large, reddish yellow ; arista brown, pubescent, longer 

 than width of f rons ; tubercle prominent, exceeding base of 

 antennae ; face produced downward. Scutellum with long, slen- 



