THE LEAF BEETLES. 



1187 



c. Elytra with a submarginal black stripe. 

 d. Abdomen densely and finely punctured, subopaque and clothed 

 with distinct pubescence. 

 e. Head coarsely punctured from side to side ; occiput piceous or 

 brown. 2192. quinquevittata. 



ce. Head smooth at middle. 



/. Discal black stripes of elytra narrower than yellow one each 

 side; head and body beneath always pale yellow; labrum 



Pale. 2193. CAROLINIANA. 



//. Discal black stripes of elytra as wide or wider than the yel- 

 low one each side; head and metasternum usually more 

 or less fuscous or piceous ; labrum piceous. 



2194. CRENICOLLIS. 



dd. Abdomen very sparsely punctured and shining, its pubescence 

 scarcely visible ; thorax smooth ; head rough ; epipleurse black. 



2195. GLABRATA. 



cc. Elytra without a submarginal black stripe, the median stripe 

 broad; thorax without spots. 2196. abbreviata. 



bl). Elytra without black and yellow stripes. 



g. Elytra reddish, with a large discal black spot. 2197. discoidea. 

 gg. Elytra blackish-blue or green. 



h. Body beneath and legs entirely black; thorax with three spots 

 arranged in a triangle ; elytra punctate. 2198. triangularis. 

 hh. Body beneath and legs, in part at least, yellow. 



i. Hind femora entirely or in part piceous ; abdomen alone wholly 

 yellow ; elytra blue-black ; head wholly piceous. 



2199. XANTHOMEL3LNA. 



ii. Hind femora entirely yellow; abdomen piceous, its apex and 

 sides yellow ; head bicolored. 

 j. Elytra blue or violet ; body oval. 2200. mellicollis. 



:/./*. Elytra bright green ; form more oblong. 2201. collata. 



2191 (6950). Disonycha Pennsylvania Illig., Mag. fur Insect., VI. 1S07, 

 146. 



Oblong, nearly parallel. Head black, front yellow; thorax pale yellow, 

 usually with three black spots, the central one larger, truncate in front, 

 gradually narrowed behind ; elytra whitish-yellow with the suture, a sub- 

 marginal stripe and a median stripe not reaching the apex, black ; antenna? 

 and under surface, except the presternum and sides of abdomen, black; 

 femora reddish-yellow, tibia? and tarsi usually black or piceous. Thorax 

 more than twice as wide as long, side margins rather wide, surface shining, 

 nearly smooth. Elytra alutaceous, sparsely and finely but distinctly punc- 

 tate, and in the female often feebly sulcate between the discal stripes. 

 Length 6.5-7.5 mm. 



Throughout the State, common; more so in the northern coun- 

 ties. February 1.1-October 29. Occurs on sedges and mints in 

 moist meadows. Hibernates beneath cover along the borders of 

 marshes and lakes. 



The common form, as above described, was named uniguttata 



