376 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Close to puella, from which it may be distinguished 

 by the entirely black pilose face and frons; broad third 

 antennal joint; black pile on margins of thorax and apex 

 of scutellum and the absence of a brownish cloud on 

 the wings. 



38. Pipiza puella Williston 



Pipiza puella Williston, Synop. N. Am. Syrph., p. 27, 

 1886. 



Habitat: N. H. (Will.) Ontario! Pile chiefly whitish, 

 moderately long for a Pipiza; hind femora without a 

 spinulose triangle near the end. 



Male: Length 6 to 8 mm. Face metallic bluish black, thinly dusted with 

 white pollen, in profile considerably retreating from the antennal base to just 

 above the oral margin; Antennae black, third joint thinly whitish pubescent, 

 giving a brownish appearance, and usually with the basal half below obscurely 

 reddish; in shape elongate sub-cordate; arista wholly rather stout and not 

 much longer than third joint. Pile of the eyes tawny, of the head elsewhere 

 moderately long, whitish; except just above the base of the antennae where it 

 is black; sometimes a few black hairs among the occipital cilia. Thorax 

 and scutellum shining black, wholly whitish pilose. The white squamae with 

 a yellow margin and a fringe of whitish pile. Abdomen chiefly whitish pilose, 

 the usual areas with shorter black pile; apex of fourth segment wholly whitish 

 pilose. Legs black, tips of all the femora, front four tibiae except a broad black- 

 ish ring beyond the middle, sometimes almost wanting on the front pair, 

 basal third of hind tibiae and their ends obscurely, and the first two tarsal 

 joints yellowish ; hind basitarsi brownish apically. Wings more or less brownish 

 beyond the middle. 



Three specimens, Ontario (Curran). One specimen 

 was very kindly compared with the type in the National 

 Museum at Washington by Mr. R. C. Shannon, and 

 differed but slightly. The type, according to Mr. 

 Shannon, is somewhat teneral. 



39. Pipiza nigripilosa Williston (Figs. 30, 70, 71) 



Williston, Synop. N. Am. Syrph., p. 28, 1886. 



Habitat: Pennsylvania (Will.); Quebec; Ontario! 

 Blackish pilose; female with an arcuate interrupted 

 yellow band on second abdominal segment; hind femora 

 slightly enlarged, not bearing spinose hairs at the outer 

 end. 



Length, 7 to 8 mm. Male: Face and frons shining black, lightly dusted 

 with whitish pollen, black pilose; antennae black, third joint rather lighter, 

 elongate cordate; arista brownish black, its base yellow; eyes brownish pilose, 

 post orbital pile lighter below. Thorax and scutellum brownish or blackish 

 pilose, the upper portion of the pleurae always black pilose. Abdomen shining 

 black, the usual areas somewhat opaque; pile black, but sometimes brownish 



