14 University oj Michigan 



e^. Size smaller, abdomen not exceeding 40 mm. in length. 

 f\ Abdominal segments 4 and 5 without pale basal 

 rings, the apical black on each segment anterior to 

 them continuous with the basal black of 4 and 5, the 

 intermediate color dull or yellowish red ; segments 6 

 and 7 with this median pale area darkened so these 

 segments are nearly or quite entirely black, unmark- 

 ed; 8 reddish, indefinitely marked black, especially 



basally ; 9 and 10 black above calcndulum. 



fl Pale basal rings on segments 3 to 6 or 7, thus each 

 segment four-banded (narrow pale basal ring fol- 

 lowed by an extensive dark area, shading out into 

 an extensive pale area, followed by an apical black 

 ring) instead of three-banded (as segments 4 and 5 

 in calcndulum). 



g\ Thorax dark above, in mature specimens entirely 

 black; broad definite dark stripes on the mesep- 

 imeron and metepisternum; abdominal segments 

 3-6 with the large subapical pale area equal to 

 or more extensive than the subbasal dark area 



which shades into it ' initratuni. 



g^ Thorax yellow above with a dark middorsal stripe 

 and one on either side of the dorsum ; mesep- 

 imeron with an extensive obscure area, and mete- 

 pisternum with a very narrow obscure line; seg- 

 ments 3-6 with the dark subbasal area more ex- 

 tensive than the pale subapical area which follows 

 it siintilatiiiii. 



Key to- Females of Group j 



Usually three po^tquadrangular cells in the front wing and some- 

 times (25%) in the hind wing; area enclosed by the fork below of 

 the thoracic middorsal carina black; abdomen 40 mm. or more in 



length triccllularc.^'^ 



Two postquadrangular cells in front and hind wings. 

 b\ A dark longitudinal dorsal stripe on either side of abdominal 

 segment 2 dull and interrupted or wanting, not black and contin- 

 uous and wider apically; sides above of 3 little if any darkened 

 subbasally, hence a narrow middorsal pale line continuous with a 

 pale basal ring wanting or obscure. 



^'' I have before me a single female lacking the entire abdomen, so I do not 

 try to place this species in the key more satisfactorily. It will be immediately 

 recognized by the characters given. Some other species are nearly as large. 



