ART. 23 REVISION OF THE BEETLE GENUS OEDIONYCHIS BLAKE 31 



sion short, often indistinct; interocular space about half width of 

 head. Pronotum over twice as wide as long, with wide, explanate 

 margin, sparsely and faintly punctate, reddish brown. Scutellum 

 black. Elytra slightly convex, rounded oval, with moderately wide 

 explanate margin, humeral prominences and basal callosities near 

 suture well marked, with deep sulcus between; punctation shallow, 

 fine, coarser at base; color entirely deep black, with no trace of yellow 

 brown on margin or apex, margin sometimes deep reddish brown but 

 not so light reddish brown as head and prothorax, moderately shin- 

 ing. Body beneath finely pubescent, shining dark brown, epipleura 

 reddish brown. 



Length. — 4 to 5 mm. ; width 2 to 2.5 mm. 



Tyfe locality. — Carolina. 



Distribution. — Virginia, " Carolina," Florida, Alabama, Louisiana. 



The name Oedionychis quercata was applied by Horn, who has 

 been followed by most authors, to the species here treated as circum- 

 data Randall. The writer examined the Bosc collection at the Paris 

 Museum, and found the species there labeled quercata to be quite 

 unlike Horn's concept of the species. Fabricius' description of the 

 species as having immaculate, ferruginous head and prothorax and 

 black elytra with femlginous margin corresponds perfectly with the 

 specimen at Paris. There is no trace of a yellow brown margin to 

 the elytra. Again, contrary to Horn's description, the sides of the 

 elytra are distinctly arcuate, in this respect resembling Oe. subvittata. 

 Olivier's illustration, while correct, may have been misleading be- 

 cause of the too sharp distinction in color between the dark elytra 

 and the red elytral margin. Examination of the Bosc specimen 

 shows that this apparent difference in color is due simply to a thin- 

 ning of the margin, which thereby appears deep reddish brown but 

 not so light reddish brown as the head or prothorax. This is not 

 the case in all specimens. The measurements of the Bosc specimen 

 are: Length 4 mm., width 2.5 mm.; and the locality is simply 

 " Carolina." 



Oe. circumdata (confused by Horn with quercata) differs in shape, 

 having elytra with more parallel sides, and in color, the head, pro- 

 thorax, and elytral margins being yellow brown, and the head fre- 

 quently with a darker spot on occiput. Oe. quercata differs from both 

 Oe. subvittata (dark form) and saltatra by having no yellow brown 

 on head, prothorax, or elytral margins, and no darker occipital spot. 



25. OEDIONYCHIS PERVITTATA, new species 



Fig. 28 



Hounded oval, moderately shining, yellow brown with a broad, 

 black lateral vitta on each elytron, widening in lower half and ex- 



