Vol. XI] CURRAN— REVISION OF THE PIPIZA GROUP 349 



black, tips of the four anterior femora, basal quarter of front and third 



of middle tibia? and first two joints of their tarsi, together with tip 

 of hind basitarsi and the following joint, yellowish; pile of legs sparse, long, 

 whitish, hind tibia? below with shorter black pile. Wings hyaline, stigma yel- 

 lowish; last section of fourth longitudinal vein angulated at its middle, of 

 fifth rectangular. 



Female: Face and front shining greenish black, white pilose except across 

 upper part of front and immediately above base of antennae where the pile is 

 black; sides of face and front to middle narrowly whitish pollinose; about middle 

 of frontal orbits a small triangular spot, well separated from the lateral stripes. 

 Antenna? black, all the joints yellowish below; eyes short black pilose, with bare 

 stripe as in male; occipital cilia cinerescent. Thorax, scutellum and abdomen 

 shining greenish black, short white pilose; pile of pleura? longer; abdomen with 

 black pile as in male; scutellum rather large and usually with a well-marked 

 apical groove; legs as in male, but tip of hind femora and narrow base of its 

 tibia? yellow. 



Five males and six females from various parts of 

 Ontario, May to July (Curran). This is the only species 

 I have examined which is distinctly brassy in some 

 reflections. Only one female showed the same character 

 very markedly. In good specimens the microscopic 

 pile of the arista is very evident, but it may be hard to 

 discern in specimens which have been wet. 



2. Pipizella pulchella (Williston) 



Pipiza (Pipizella) pulchella Williston, Synop. N. Am. 

 Syrph., 29, pi. ii, figs. 1, la, lb.; 1886. 



Habitat: Connecticut, Massachusetts, (Will.) 



"Female: Length, 5.5 mm. Shining greenish black, clothed with not very 

 abundant nor long, nearly white, pile. Front and face wholly white pilose, 

 the former with a small, triangular spot near each orbit, the latter with a 

 narrow orbital margin, white pollinose; post orbital cilia white, the short pile 

 of the eyes dark; face gently convex near the middle; antenna? elongate, but 

 shorter than the face, the third joint three or four times as long as wide, black, 

 yellowish on the lower basal part. Scutellum with a slender deep groove before 

 its margin. Abdomen very short pilose; on the posterior parts of the second 

 and third segments black, elsewhere nearly white. Legs black, white pilose; 

 tip of all the femora, base and immediate tip of the anterior tibia?, first two 

 joints of the anterior and middle two of the hind tarsi, yellow; hind basitarsi 

 considerably thickened. Wings grayish hyaline; last section of the fourth 

 vein angulated at its middle; posterior cross-vein rectangular; stigma luteous." 

 (Williston.) 



3. Pipizella pulchella banksi, new subspecies (Figs. 102, 103) 



Habitat: Virginia! Front basitarsi not thickened; 

 bare stripe of eyes broad; third antennal joint about 

 four times as long as wide, basal antennal joints yellow; 

 wings hyaline. 



Female: Length 5.5 mm. Face and lower fourth of frons shining metallic 

 blue, frons elsewhere more blackish, steely; pile white, in front of ocelli black; 



