ART. 23 KEVISION OF THE BEETLE GENUS OEDIONYCHIS BLAKE 19 



uniting to form large rounded blotch, and very narrow sutural vitta, 

 and in dark form a wide median vitta and narrow marginal one on 

 each elytron. Antennae half length of body, stout, reddish brown 

 basal joints deepening to piceous outer joints, third joint longer 

 than fourth. Head varying from pale brown in paler forms to 

 nearly black in vittate forms, in this dark form resembling Oe. vians 

 in having two obscure reddish brown frontal spots, these spots often 

 widening to leave only a narrow dark interocular band and a dark 

 band or spot on posterior part of occiput; coarsely punctate except 

 on middle of occiput; median depression rather indistinct, inter- 

 ocular space over half as wide as head. Pronotum twice as wide 

 as long, nearly rectangular, narrowed anteriorly with straight sides ; 

 explanate margin very narrow, punctations distinct and not dense; 

 five dark brown or piceous spots, frequently uniting to form a 

 rounded blotch or even a broad fascia. Scutellum rounded, piceous. 

 Elytra elongate-oblong, moderately convex, with narrow margin; 

 humeri rounded, a distinct basal sulcus within ; punctation variable, 

 usually shallow and moderately coarse, smoother toward apex; in 

 paler forms at most only faint trace of vittae, usually a darker area 

 surrounding scutellum, and piceous sutural edges forming a narrow 

 vitta; in vittate forms a broad piceous median vitta nearly covering 

 each elytron, but not reaching apex, and narrow piceous margin 

 uniting with sutural vitta. Body beneath finely pubescent, abdomen 

 and prosternum reddish yellow, meso- and metasterna and tibiae and 

 tarsi dark brown or piceous, outer edge of femora sometimes darker, 

 epipleura pale. 



Length. — 5 to 7 mm. ; width 2.5 to 3 mm. 



Type locality. — North America. 



Distribution. — Massachusetts, New York, Maryland, District of 

 Columbia, Virginia, Ohio, North Carolina, South Carolina, Georgia, 

 Florida, Alabama, Mississippi, and Texas. 



11. OEDIONYCHIS GIBBITARSA (Say) 

 Fig. 9 



Altica gihbitarsa Say, Journ. Acad. Philadelphia, vol. 4, 1824, p. 83. 

 Oedionychis gibbitarsa Crotch, Proc. Acad. Philadelphia, vol. 25, 1873, p. 60. — 

 HoEN, Trans. Amer. Ent. Soc, vol. 16, 1889, p. 181. 



Rounded oblong-oval, moderately convex, very lustrous, head and 

 pronotum yellow brown, pronotum usually with piceous spots, elytra 

 green, blue, or purple. Antennae about half as long as body, moder- 

 ately stout, piceous, basal joints lighter, third and fourth joints about 

 equal. Head nearly smooth, rather finely punctate on front and 

 about eyes; front flat with tubercles and median depression indis- 

 tinct, interocular space half width of head. Pronotum nearly three 

 times as wide as long, almost rectangular, with wide explanate mar- 



