SYNOPSIS OF NORTH AMERICAN SYRPHID^. ^5 



fascifE across the second, third, and fourth segments arc broader and 

 sometimes quite reddish or yellowish in the middle; pile yellow on the 

 yellow portions, black elsewhere. Legs yellow; the hind tarsi reddish 

 or blackish, except the last two joints. Wings hyaline; the stigma 

 yellowish. 



Six specimens from Connecticut. This species is found usually in 

 thick, shady vegetation, in damp places. 



Xantliogramma aequalis. (Plate IV, fig. 6.) 

 Doros «'(/Ha7/s Loew, Centnr., iv, 84. 

 Sahitat. — Pennsylvania (Lw.), District of Columbia ! 



5 . Length, 8""^. Face bright yellow, a brown spot on the cheeks, 

 and a small faint one on the tubercle. Antennte black, the basal joints 

 and base of the third joint reddish. Front rather narrow above; yel- 

 low, black at the vertex, continued as a rather narrow black stripe to 

 the base of the antennae. Thorax black, nearly bare ; near the middle of 

 the dorsum with two faint pollinose stripes; on the lateral margin with 

 a narrow, well-defined, bright-yellow stripe ; on the posterior margin, 

 with a rather small transverse yellow spot, cut in two, or nearly so, by 

 a rectangular black emargination in front. Pleurae w^th two oval, 

 bright yellow spots, one on the sterno-pleurce and one above the front 

 coxae. Scutellum reddish, blackish at the base, along its border with 

 a row of short, light-colored hairs. Abdomen cylindrical in front, com- 

 pressed behind, shining black, with rather narrow bright-yellow bands, 

 as follows : An arcuate baud near the middle of the second segment ; 

 a straight one at the base of the third segment; one at the base and 

 one at the posterior margin of the fourth segment, the posterior one 

 dilated in the middle ; on the posterior margin of the third segment 

 there is a small median yellow spot, and on the fifth segment there is a 

 slender longitudinal stripe, not quite reaching the anterior margin. 

 Yenter with four yellow cross bands, the first three rather broad, and 

 situated upon the posterior margin of the preceding and anterior mar- 

 gin of the following segments ; the fourth band is linear, and situ- 

 ated upon the hind margin of the fourth segment. Legs yellow; the 

 femora broadly, in the middle (especially the hind pair), the tip of the 

 hind tibiae, and the hind tarsi, reddish or brownish. Wings nearly 

 hyaline, along the front border rather narrowly and equally brown. 



$ . Length, 9.5™". Head yellow, vertical triangle and occiput black, 

 the latter white pollinose on the margin. Frontal lunule, antennae, 

 and cheeks blackish pitchy. Thorax black, clothed with lutescent 

 and whitish blackish pile ; dorsum on each side with a yellow stripe, 

 and on the [posterior] margin with two confluent spots ; besides these, 

 with two, more obsolete, whitish pollinose stripes. Pleurae yellow bimac- 

 ulate. Scutellum testaceous. Abdomen of equal width, black, shining, 

 with three narrow yellow fasciae; the first moderately arcuate, in the 

 middle of the second segment; second and third straight, at the base 

 of the segments, both narrowly interrupted ; basal fascia of fifth seg- 



