NORTH AMERICAN COLEOPTERA. 99 



P. COStipeiiUiM u. sp. — Form of discoidea; head and thorax yellow, elytra 

 black, with the entire limb aud suture narrowly yellow. Antenr.te entirely 

 black. Head smooth. Thorax wider than long, sides slightly arcuate in front, 

 straight and convergent behind, disc smooth, on each side of middle a large, but 

 shallow fovea. Elytra with the suture elevated and four distinct discal costse, 

 between which the surface is distinctly punctate. Body beneath yellow, abdo- 

 men piceous, sparsely finely punctate; femora yellow, tibise in greater part and 

 tarsi piceous. Length .24 -.28 inch. ; 6— 7 mm. 



In the niiile the segments 2-8-4 are short, and have a slight gib- 

 bosity on the median line. The last ventral is very large, convex, 

 with a shallow median depression, and at middle of apex a short 

 oval lobe limited each side by a sinuation. The last dorsal is trun- 

 cate and broadly emarginate. The female ventral segments are of 

 normal structure. 



This species may be readily known by the costate elytra. The 

 male sexual characters resemble those of discoidea. 



Occurs in Georgia and Florida. 



P. clisc<»iclea Fab., Syst. El. i, p. 485; circumdata Say. Journ. Acad, iii, p. 

 457; edit. Lee. ii, p. 221. — Form of decornta. Head smooth, yellow. Antennge 

 black, the three basal joints often paler, but not conspicuously so. Thorax wider 

 than long, slightly wider at apex, sides slightly sinuate, disc smooth, a moder- 

 ately deep foveiform depression each side of middle. Elytra piceous black, with 

 the base, suture and side margin yellow, surface sparsely punctate, and in the 

 females vaguely subcostate. Body beneath yellow varying to brownish. Legs 

 yellow, tips of tibise and tarsi piceous. Length .14— .26 inch. ; 3 5 — 6.5 mm. 



In the male the third and fourth segments of the abdomen are 

 short, together but little longer than the second ; the last ventral is 

 large, convex, a slight median depression, the apex bisinuate. The 

 last dorsal is emarginate at middle and on each side ciliate. In the 

 female the segments 2-3-4 are gradually shorter, the fifth oval at 

 tip, the last dorsal entire. 



No variations worthy of note have been observed. 



It is very clear that Dr. LeConte and others have confused three 

 species under the name discoidea, the present species, limbcda, and 

 another which he mentions as a curious color variety. That Fab- 

 ricius clearly differentiated his two species is very evident from his 

 mention of the black antenna and the blfoveate thorax of the ])res- 

 ent species. Say's synonym has been fixed by the antennae. The 

 male sexual characters separate the two beyond all doubt. In the 

 present species it will be observed that the elytra are a little less 

 shining from the more evident punctuation. 



Occurs in Virginia, North Carolina and Georgia. 



TRANS AM. ENT. SCO. XX. JUNE, 1893. 



