Vol. XI] CURRAN— REVISION OF THE PIPIZA GROUP 381 



together with a male, which I am sure does not belong 

 to f estiva. He also determined as albipilosa two males 

 which are distinctly different; one of these bears almost 

 obsolete yellow spots and is certainly femoralis, while 

 the other is larger, fully 10 mm., and much more like 

 my severnensis which he labelled as a new species near 

 puella. This larger specimen, which is not described 

 in this work, apparently is different from severnensis 

 and femoralis and has the wings very slightly clouded. 

 Until more specimens are available for examination I 

 prefer to retain this as doubtful. I do not believe the 

 true f estiva occurs in America. I have European speci- 

 mens oi f estiva, noctiluca, luteitarsis, and all the closely 

 allied species. In most of these the hind femora are 

 more enlarged than in femoralis but in no case is the 

 triangular production near the end present to a marked 

 degree. P. luteitarsis has the hind femora (fig. 37) slightly 

 less produced. I reproduce the description oi f estiva as 

 given by Williston, but believe we must discard this 

 species as American. 



45. Pipiza festiva (Meigen) 

 Meigen, Syst. Beschr., Ill, 243, 2, 1822. 



Habitat: Europe; North America? "Male and female: Length, 6.5 to 

 10.5 mm. Front and face long white pilose, below the ocelli and above the 

 base of the antennse in the female blackish pilose. Antennae brown, third joint 

 trapezoidal. Thorax white pilose; posterior parts of second and third segments 

 black pilose; second segment with a variable yellow band, 'sometimes sulphur 

 yellow, at other times reddish yellow; anterior margin concave (?) or straight; 

 sometimes interrupted by a distinct black space, at other times only by a dark 

 line' (Schiner). Legs yellow, with black femora; tibiae more or less brown 

 in the middle. Wings hyaline on basal half, externally blackish or smoky 

 brown fading out towards the margin; stigma dark luteous." (Williston). 



The species varies considerably and the range in 

 area of the yellow spots is much as in femoralis. In 

 my specimens of luteitarsis the wings are only slightly 

 darkened apically. 



46. Pipiza severnensis, new species 



Habitat: Ontario! Whitish pilose; venter of fourth 

 segment slightly emarginate in the middle; femora with 

 spinose area. 



Male: Length, 9 mm. Face broad, thinly whitish pollinose except a very 

 narrow shining central stripe; black pilose, the frons and middle of face with 



