426 The Ohio Naturalist. [Vol. IX, No. 3, 



Mexico and from the Mississippi to the Pacific. It occurs 

 sparingly farther east. The species is quite numerous at San- 

 dusky, Ohio, and has also been taken at Georgesville and 

 Cincinnati. 



D. crenicollis. Say. Oval, slightly narrower in front. Head either 

 entirely yellow or with occiput piceous. Scutellum black. Pro- 

 thorax beneath j'ellow. Metasternum black, abdomen yellowish or 

 pale brown, densely punctured and with a conspicuous silken pubes- 

 cence. Femora reddish yellow, piceous along the upper edge, tibia 

 and tarsi piceous. Length 5.5-6.5 mm. 



This species occurs from New York to southwestern Texas 

 and Mexico and has been taken in Ohio at Cincinnati. 



D. caroliniana. Fab. Oval, slightly narrower in front. Head entirely 

 yellow, entirel}' smooth except a punctured fovea at the upper inner 

 border of the eye. Thorax with two piceous spots of variable size 

 behind the apical border. Scutellum black. Body beneath reddish 

 yellow. Epiplurae entirely piceous, sometimes entirely 3'ellow. 

 Abdomen closely punctate, pubescence distinct. Legs reddish 

 yellow, tibia at tip and tarsi piceous. Length 5.-6.5 mm. 



This species occurs from Pennsylvania to Florida and has been 



taken at Columbus, Ohio. 



D. glabrata. Fab. Oblong oval, surface very shiny, as if varnished. Head 

 variable in color, often entirely black or entirely yellow. Thorax 

 yellow with a narrow median spot, often indistinct". Scutellum black. 

 Body beneath yellow, posterior portion of inetasternum rarely 

 piceous. Abdomen finely alutaceous, sparsely punctate. Legs 

 yellow, tips of tibia and tarsi piceous. Length 5.-5.5 mm. 



Occurs from Georgia to Arizona and has been reported from 



Columbus and Cincinnati, Ohio. 



D. abbreviata. Mels. Oval, slightly oblong. Head j-ellow, surface smooth, 

 a rounded punctured fovea at the upper and inner border of the eye. 

 Scutellum 3'ellow. Body beneath and epiplurae yellow. Abdomen 

 sparsely punctate, shining, pubescence short. Legs yellow, the 

 outer side of the tibia and tarsi black. Length 6.-8.5 mm. 



Occurs from the Middle States to Florida and Texas, extend- 

 ing into Mexico. Also reported from Columbus and Cincinnati, O. 



D. triangularis. Say. Form oval, rather depressed, feebly shining. 

 Entirely black, thorax reddish yellow with three black spots arranged 

 in a triangle. Head entirely black. Prothorax beneath yellow. 

 Abdomen coarsely punctate, pubescence short and indistinct. Legs 

 entirely black. Length 5.-6.5 min. 



Occurs in the entire region east of the Rocky Mountains, 



including Canada. Reported in Ohio from Columbus and 



Cincinnati. 



D. xanthomelaena. Dalm. Oval, slightly depressed, feebly shining, 

 thorax yellow, elytra dark blue. Head black with a few coarse and 

 deep punctures, irregularly placed. Prothorax beneath yellow, meta- 

 sternum black. Abdomen entirely yellow, densely jiunctate with dis- 

 tinct pubescence. Femora yelUnv at basal half, (sometimes entirely 

 black) the a])ical piceous, also the tibia and tarsi. Length 5.5 mm. 



Occurs from the New England States to Kansas, Texas and 

 Florida. Reported in Ohio from Columbus and Cincinnati. 



