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 scarcelv 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.crenicollis. 
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.mellicollis. 
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 Sanduskv, 
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 
