NORTH AMERICAN COLEOPTKRA. 209 



tate, finely ahitaceous. Body beneath more shining than above. Abdomen 

 alutaceoiis, the ininctures very sparse and indistinct, tlie pubescence very short. 

 Legs entirely black. Length .20 — .26 inch. : 5—6.5 mm. 



There need be no difficulty in the identification of thi.s species ; 

 the antennje are nuich stouter than in any other and rather shorter. 

 The male is narrower than the female, and the oblique truncation of 

 the base near the hind angles is very feeble. 



Occurs in Georgia. 



12. I>. triangularis Say.— Form oval, rather depressed, feebly shining, 

 entirely black, thorax reddish yellow with three black spots arranged in triangle, 

 the anterior pair round, the posterior linear and median. Anteunai slender, half 

 the length of the body, piceoiis, the three basal joints pale beneath. Head en- 

 tirely black, frontal carina obtuse, the tubercles imiistinct, vertex and occiput 

 coarsely and rather closely punctate. Thorax more than twice as wide as long, 

 narrowed in front, sides feebly arcuate, the margin very narrow, surface aluta- 

 ceous rather finely, not closely punctate. Elytra a little wider at base than the 

 thorax, humeri obtuse, umbone not prominent, surface moderately closely, dis- 

 tinctly punctate; color black, with a slight bluish tinue. Prothorax beneath 

 yellow. Abdomen rather coarsely, not closely punctate, pubescence short and 

 indistinct. Legs entirely black. Length .20— .25 inch. ; 5 — 6.5 mm. 



This species is remarkably constant in all its characters, and but 

 little variable in size. It is readily known by the entirely black 

 color beneath and the three spots on the thoi-ax. 



Occurs in the entire region east of the Rocky Mountains, including 

 Canada. 



13. D. xantllOinelaMia Dalm.— Oval, slightly depressed, feebly shining, 

 thorax yellow, elytra dark blue. Antennve slender, a little longer than half the 

 body, piceous, the three ba-sal joints pale beneath and in front. Head black, 

 front piceous, frontal carina moderately prominent, tubercles distinct, occiput 

 with a few coarse and deep punctures irregularly placed. Thorax yellow, im 

 maculate, not twice as wide as long, narrowed in front, sides very slightly arcu- 

 ate, margin narrow, surface almost entirely smooth, the punctures very minute 

 iind sparse. Elytra wider at base than the thorax, humeri rounded, umbone not 

 prominent, surface finely alutaceou.s, obsoletely punctulate. Prothorax beneath 

 yellow, metasternum black. Abdomen entirely yellow, rather densely punctate 

 and subopaque, with distinct pubescence. Femora yellow at b.isal half (some- 

 times entirely black), the apical piceous, also the tibise and tarsi. Length .22 

 inch. ; 5.5 mm. 



This species has heretofore been known in our cabinets, and is the 

 one everywhere quoted as collarls Fab., but I am unable to adopt 

 this name for the following reason — the description does not apply — 

 " Statara et viagidtudlne jwa-cedentium' ( (Ed. faselata., about .35 

 inch. ; 9 nun.) ; " thorax rufun, macida una alterave dorsa/i, nigra" 

 (certainly not so); ''abdomen nigrum ana rtifo" (abdomen entirely 

 yellow); "pedes nigri" (bicolored here). 



TRANS. AM. ENT. SCO. XVI (27) .JUNE, 1889. 



