412 PROCEEDINGS OF THE NATIONAL MUSEUM vol. n? 



finely punctured; intervals subconvex, finely and densely punctured; 

 elytral margins feebly arcuate, nearly parallel, bead fine, slightly 

 reflected. Prosternal process with parallel sides, its apex deflected 

 and obtuse, not prominent. Ventral surface of pronotum with strong 

 longitudinal ridges instead of punctures, entire ventral surface coarsely 

 and densely punctured except apical two abdominal sternites where 

 punctures are fine and sparse. Male genitalia with ventral portions 

 of lateral lobes continued backward as two short spines ; dorsal portions 

 fused basally to form a broad shallow arc without a trace of former 

 lines of fusion (pi. 4, fig. 30). No apparent external sexual dimor- 

 phism. Measurements: length 4.2-5.7 mm.; width 2.2-2.6 mm. 



Remarks.- — -This species may be readily separated from P. subcost- 

 atum, its nearest ally, by its smaller, narrower form, the metallic 

 coppery, bluish or greenish reflections of the dorsum, and the presence 

 of coarse longitudinal ridges on the ventral side of the pronotum. The 

 male genitalia are quite distinctive in that the lateral lobes are 

 fused basally, thus obscurmg their paired condition. 



Type. — In the Melsheimer collection (MCZ) there are two speci- 

 mens of the present species, both without data. One of these is 

 hereby designated as lectotype but as yet has not been assigned an 

 accession number. Type locality, Pennsylvania. 



Specimens examined. — From the following localities, 156: 



United States. Alabama (Barton, Mobile). Arkansas. District of Columbia. 

 Florida (Crescent City, Enterprise). Georgia (Atlanta, Cornelia, Dunwoody). 

 Illinois (Chicago, Downers Grove). Indiana (Posey Co., Putnam Co., Vigo Co.). Kansas. 

 Kentucky (Fi-ankfort) . Louisiana (Covington). Maryland. Massachusetts 

 (Amherst, Framingham, Lowell, Natick, Sherborn, Tyngsboro, Wayland). Mich- 

 igan (Detroit). Mississippi (Lucedale, State Line). Missouri (New Hartford, 

 Saint Charles). New Jersey (Anglesea, Fort Lee, Paterson, Wenonah). New 

 York (Bergen Beach, West Point). North Carolina (Murphy, Saluda, Tryon). 

 Ohio (Athens, Delaware Co., Scioto Co.). Pennsylvania (Easton, Harrisburg, 

 Jeannette, Pittsburgh, State College, Allegheny Co., Washington Co., York Co.). 

 South Carolina (Camden). Texas (Houston). Virginia (Mount Vernon). West 

 Virginia (Morgantown, White Sulphur Springs). 



Platydema ruficorne (Sturm) 



Plate 5 (Figs. 40, 41) 



Diaperis ruficornis Sturm, 1826, p. G9, tab. 3, fig. 21. 



Platydema ruHventris Laporte and Brulle, 1831, p. 378. — Haldeman, 1848, p. 101. 

 Neomida ruficornis (Sturm). — Sturm, 1843, p. 155. 

 Neoviida rufa Melsheimer, 1846, p. 62. 

 Platydema analis Haldeman, 1848, p. 101. 



Platydema ruficorne (Sturm).— Horn, 1870, p. 382; 1885, p. 111.— Blatchley, 1910, 

 p. 1263.— Cotton, 1941, p. 9, fig. 15.— Back and Cotton, 1953, p. 31, fig. 43. 

 Platydema opaculum Casey, 1884, p. 51; 1890, p. 485. 



