

70 Myron Hannon Sivenk 



example), and a few other minor differences. From siilphurata, 

 of the eastern states, it differs in the lack of black lines in the 

 upper clypeal sutures and the black patch above antennae, in the 

 nearly concolorous third antennal joint, in the broad reddish 

 bands on the disk of the mesoscutum instead of being wholly black 

 or usually with yellow stripes, in the reddish apical margins of 

 tergites 1-4, in the more largely yellow venter, and in having the 

 basal nervure interstitial with the transverso-medial. 



The male of flavomargmata differs from A^. rivalis Cresson, 

 which is known only in the male and is almost without doubt the 

 male of citrina (in which case the species would be known as 

 rivalis), by the wholly yellow mesoscutellum, the great median 

 narrowing of the transverse yellow pleural patch, and the broad 

 transverse s'tripes on the margins of the sternites. From the 

 male of A'', siilphurata Smith it dift'ers in having the lateral 

 margins of the mesoscutum black, in the smaller propodeal spots, 

 in the lack of a yellow spot before anterior ocellus, and in having 

 the margins of the sternites blackish. The males of perivincta, 

 semirufula and rufula are unknown, or unrecognized as such. 

 The detailed description of the new form follows : 



?. Length 9 mm. Clypeus except small spots on lateral sutures, lateral 

 face marks extending above level of insertion of antennae, scape in front, 

 labrum, base of mandibles, inferior and broad posterior orbital margins, 

 collar, tegulae, suprategular stripes, axillae, elevated portions of meso- 

 scutellum and metanotum, large quadrate spots involving all of the pos- 

 terior face of the propodeum except a red median line, tubercles, pleura 

 and pectus except a large red spot with small black center on the lower 

 side of each pleurum, legs except a reddish suffusion on coxae, trochanters 

 and femora behind and black lines on posterior femora and tibiae below, 

 tergum except a basal area and narrow reddish lines on the apical margins 

 of tergites 1-4 which broaden medially, a large trilobate mark on the 

 otherwise red first abdominal sternite and remainder of venter except 

 narrow, usually concealed, bases of sternites 3 and 4, bright lemon yel- 

 low. Vertex except a black ocellar patch, a suffusion behind the yellow 

 postorbital line, two broad bands involving most of the disk of the meso- 

 scutum, and spots on sides of propodeum, red. Antennae with the 

 fiagellum red, strongly blackened above and toward apex, joint 3 about 

 two-thirds as long as 4. Wings hyaline, nervures yellowish red, stigma 

 paler, basal nervure interstitial with the transverso-medial on the basad 

 side. 



