248 



CCXNECTICLTT GEOL. AND NAT. HIST. SURVEY [Bull. 



Key to Species 



1. Wings longitudinally striped with brown and whitish, the pattern tending 



to become obsolete or dilute in certain species; a dark seam on veins 



Cu and m-cu {Vittatae) 2 



Wings unmarked except for the stigmal darkening and a yellowish to brown 

 costal border, or else (iroquois) with the apex of wing irregularly dark- 

 ened ; no dark seam on veins Cu and m-cu 17 



2. Antennae with the scape and pedicel darkened, the flagellum uniformly light 



yellow throughout manahatta 



Antennae with the flagellum not uniformly yellow 3 



3. Wings with at least the outer portion of cell Rs white, the area nearly if 



not quite continuous with the pale central area in cell M 4 



Wings with the cells beyond cord, including Ro, darkened ; (in some jratcrna, 

 the outer end of cell R-o is pale but the area is isolated by dark color be- 

 yond cord) 12 



4. Antennae with outer flagellar segments uniformly dark brown, the more 



basal ones yellowish brown 5 



Antennae with the flagellar segments bicolorous, yellow, the bases dark- 

 ened 6 



5. Size large (wing, $, over 20 mm.) ; wing-pattern heavily contrasted; cell 



R chiefly dark brown, cell M abruptly pale ; stigma yellowish ; male hy- 

 popygium with median tergal lobe narrow, subtended on either side by 



lateral claws (Fig. 28, M) noveboracensls 



Size smaller (wing, $, 16 mm. or less) ; wing-pattern pale and diffuse, cells 

 R and M chiefly pale ; stigma brown ; male hypopygium with median ter- 

 gal lobe broad, without lateral armature vicina 



6. Wings with bases of cells Mi and 2nd M-2 pale ; cell R immediately before 



origin of Rs not conspicuously pale, this color being confined to outer end 



of cell 7 



Wings with cells Mi and 2nd M2 uniformly darkened; cell R with invasion 

 of pale coloration before origin of Rs 10 



7. Abdomen ochre-yellow, without lateral brown stripes ; cell 1st M- entirely 



pale conspicua 



Abdomen with conspicuous brown sublateral stripes on tergites ; cell 1st M2 

 with outer half or more darkened 8 



8. Antennae ($) short, if bent backward not attaining wing-root; basal half 



of cell M or nearly so dark brown caloptera 



Antennae ($ ) longer, if bent backward extending to mid-distance between 

 roots of wings and halteres; cell M with only the basal fourth or fifth 

 darkened 9 



9. Wing-pattern pale and diffuse, not strongly contrasting; vein 2nd A not or 



only weakly bordered by brown strepens 



Wing-pattern strongly contrasted ; vein 2nd A, except at base, margined 

 with brown calopteroides 



10. Wings with the dark and light pattern contrasted, the white coloration in 



cell R more extensive, reaching vein R or nearly so before the origin of 

 Rs, the dark costal border thus with its posterior margin appearing bisin- 



uate furca 



Wings with the dark pattern more diffuse and less contrasted, not so con- 

 spicuously invading cell R before origin oi Rs and the dark costal stripe 

 not appearing bisinuate 11 



11. Cell 1st Mi entirely clear, the pale area in cells R and M thus continued un- 



interrupted to wing-tip; male hypopygium with apex of median lobe of 



tergite convexly rounded eluta 



Cell 1st Ml with more than apical half darkened, separating the pale area 

 in cell M from that in cell R„ ; male hypopygium with apex of median lobe 

 of tergite gently concave (Fig. 28, D) concava 



12. Wings with a conspicuous whitish crossband at cord, reaching the posterior 



margin of wing in cells M3 and Mi fraterna 



Wings with the whitish crossband at cord less extensive, extending through 

 cell 1st Mj or only slightly beyond 13 



