W. L. MC ATEE 307 



Key to the Color Varieties 



A. Cross-band one (anterior) involving l)asc of scutellum. 



B. Cross-band one extending along sides of pronotum, leaving disf un- 

 colored; cross-band two (middle) sanguineous to dusky, black on 

 costa. 

 C. Longitudinal color streaks present between cross-bands. 



D. Streaks red var. calycula new variety, p. 308. 



DD. Streaks yellow, .var. calycula new variety, yellow form, p. 309. 



CC. Streaks obsolete var. erasa new variety, p. 309. 



BB. Cross-band one covering all of pronotum except a small i)art of an- 

 terior margin. 

 C. Cross-bands one and two sanguineous to l:)lack. 



D. Longitudinal color streaks yellcnv. ..var. tricincta Fitch, p. 307. 



DD. Streaks red var. tricincta Fitch, red form, p. 308. 



CC. Cros.s-bands one and two iM-ight red; longitudinal color streaks 



yellow var. diva new variety, p. 308. 



AA. Cross-band one not covering base of scutellum. 



B. Cross-band one sanguineous to dusky, covering most of j)ronotum; 

 cross-band two sanguineous to bright red, l)lack on costa; cross-band 

 three yellow-brown on apical half. 

 C. Longitudinal color streaks red., var. Integra new variety, j). 309. 

 CC. Longitudinal color streaks yellow. 



var. Integra new variety, yellow form, p. 309. 

 BB. Cross-band one dusky to black, profoundly emargiuate anteriorly, 

 leaving a large part of disk of pronotum uncolored. 

 C. Cross-ljand continuous across hind margin of jjronotum. 



var. cymbium new variety, p. 310. 

 CC. Cross-lKind (?) broadly interrujited, covering only sides of pro- 

 notum var. disjuncta new variety, p. 310. 



Erythroneura tricincta var. tricincta Fitch 

 Bibliographical reference same as for species. 



In this variety the anterior cross-band covers most of pronotum, 

 as well as base of scutelkun; cross-band two is sanguineous to 

 dusky, terminating laterally in black, and the interspaces lie- 

 tween cross-bands are streaked or even generally suffused with 

 sulphur yellow. There is no doubt that this is the typical variety 

 of Fitch; the anterior cross-band is as he (lescril)ed it, and he 

 speaks of the whole insect as pale yellow, which he would not have 

 done had he the red-streaked form before him. 



Length, 2.7 mm.; vertex: LM 7, LE 4, WA 15, WF 21, OA 6.5, OP 12, 

 OH 16; pronotum: L 10, W 21; tegmen 14-53. Measurements from a fe- 

 male; Plummer's Island, Maryland, July 19, 1914, W. L. McAtee. 



TR.\NS. AM. ENT. SOC, XLVI. 



