Nov., 1911.] Life-Histories of Syrphidae II. 40 r 



Adult. 

 Genus Paragus Latrcille. 

 Description slightly modified from Williston. Btill. U. S. Nat. 

 Mus., No. 31, 89, (1SS6), p. 17. vSmall neariy bare species, 

 abdomen curved downward at the tip black or greenish black 

 with yellow on the face and reddish on the abdomen. Head 

 broader than thorax; antennae about as long as the head, first and 

 second joints short third longer than first two together; arista 

 before the middle bare. Face convex with an obtuse tubercle. 

 Eyes pilose, narrowly contiguous and often with an area of 

 erilarged facets on the upper anterior part in the male. Abdomen 

 as wide as thorax and twice as long of nearly equal width through- 

 out, a shallow transverse depression on each segment, the distal 

 end bent downward. Hind metatarsi much thickened as long as 

 the remaining joints together. Marginal cell of wing open, third 

 longitudinal vein straight, anterior cross-vein near the base of 

 discal cell, the last section of fourth vein sinuate, terminating in a 

 right angle on the third vein at a considerable distance before the 

 tip. 



Paragus bicolor (Fabricius). 



cf 9 Length 5-(3 mm. Eyes pubescent, the pile mostly grouped 

 in two vertical stripes separated by a distinct vertical glabrous stripe 

 (Figs. 29, 30). Face in the female white pilose with a shining 

 black stripe reaching from antennae to the oral margin, narrower 

 below; in the male wholly pure light sulphury yellow with yellow 

 pile. Oval margin and cheeks shining black. Antennae black 

 with some whitish pollen, the under side of the third joint reddish. 

 Front of female narrowed above, not more than half as wide at the 

 vertex as at the base of the antennae (Fig. 30) ; shining black 

 narrowly dusted with whitish on the sides below, the latter not 

 quite reaching the light color on the sides of the face; frontal 

 triangle sulphur yellow, the eyes touching midway, and for about 

 one-fifth the distance, between the anterior ocellus and the base 

 of the antennae; "vertical triangle black light pollinose in' front. 

 Thorax black, a little shining with yellowish pile, in front with two 

 whitish pollinose stripes. Pleurae silvery white pilose. Scutellum 

 with a whitish border not extending to the anterior angles. 

 Abdomen chiefly red, but variable in color; first segment black; 

 second segment, often wholly black sometimes more or less red 

 behind, sometimes only black on the sides. The black usually 

 extends narrowly along the sides of the third segment, sometimes 

 of the fourth and fifth also ; rarely, the third segment has a blackish 

 band. Pile on the sides of the segments in front and on the lateral 

 margins, and on the fifth segment, white, elsewhere obscure. 

 Legs variable, frequently the basal portion of the front and mid- 

 dle femora and the hind femora except the tip are black, elsewhere 

 yellowish. Wings, nearly hyaline; stigma, dilutely yellowish." 



