Jan., 1908.] The Ohio Species of the Genus Disonycha. 425 



2. Elytra vittate 3 



Elytra with large discal spot black discoidea. 



Elytra dark violet, olive or green 8 



3. Elytra with a submarginal vitta 4 



Elytra without submarginal vitta 7 



4. Abdomen densely punctured, subopaque, the pubescence con- 



spicuous 5 



Abdomen very sparsely punctured and shining. 



Pubescence scarcely visible 6 



5. Head coarsely punctured from side to side; occiput piceous or brown. 



quinquevittata. 

 Head smooth at middle. 

 Elytral vittae rather broad, head and metasternum more or less 



fuscous or piceous, labrum piceous crenicoUis. 



Elytral vittae narrow, head and body beneath always pale yellow, 

 labrum pale caroliniana. 



6. Thorax smooth; head rough; epipleurae black glabrata. 



7. Median elytral vitta broad; antennae normal; thorax not spotted.. . 



abbreviata. 



8. Body beneath and legs entirely black; thorax with three spots in a 



triangle ; elytra punctate triangularis. 



9. Posterior femora entirely or in part piceous.. 



Abdomen alone entirely yellow; hind femora bicolored or entirely 



black; head piceous; elytra blue-black xanthomelaena. 



Posterior femora entirely yellow; abdomen piceous, apex and sides 

 yellow; head bicolored. Elyrta blue or violet; form of body oval, as 



in xanthomelaena mellicoUis. 



Elytra bright green, form more oblong collata. 



D. pensylvanica. Illig. Oblong, nearly parallel. Head black, front yellow, 

 surface nearly smooth except a small group of punctures near each 

 eye. Scuttelum black. Body beneath entirely black, side margin of 

 elytra and outer side of epiplurae yellow, the inner margin usually 

 piceous. Abdomen finely pubescent; legs variable in color from black 

 to rufous. 



This species occurs all over the United States and Canada, 

 but is more especially the species of the northern region, that is 

 to say, it extends east and west, north of the fortieth parallel of 

 latitude. In Ohio this species has been taken at Sandusky, 

 Columbus, and Cincinnati and probably occurs elsewhere in the 

 state. 



D. discoidea. Fab. Oval, slightly depressed. Head yellow, surface 

 smooth, a small fovea at the upper inner border of the eye. Scutellum 

 yellow. Body beneath, entirely yellow. Abdomen punctate, pubes- 

 cence distinct, but not conspicuous. Legs yellow, the outer side of 

 the tibia and the tarsi black. Length .22-. 30 inch; 5.5-7.5 mm. 



This species varies but little and occurs generally from North 

 Carolina to Texas. The species has been taken from Hanging 

 Rock and Cincinnati in southern Ohio. 



D. quinquevittata. Say. Oblong oval. Head yellow and except in rare 

 instances with the occiput piceous; coarse and deep punctures 

 extending from side to side of vertex. Thorax with 5 black spots, 

 often only two present. Scutellum black. Epiplurae pale; body 

 beneath reddish yellow. Abdomen densely punctured, pubescence 

 close and conspicuous. Legs reddish yellow, tibia at tip darker, 

 tarsi piceous. Length 5.5-9. mm. 



This species is especially that of the entire region west of the 

 Mississippi River, extending from our northern boundary to 



