16 PROCEEDINGS OF THE NATIONAL MUSEUM voi .. 70 



median groove short and distinct. Pronotum twice as wide as long, 

 almost rectangular, with narrow explanate margin, pale yellow, 

 sometimes waxen, shining and nearly impunctate. Scutellum 

 rounded, black, shining. Elytra oblong, moderately convex, with 

 rounded humeral prominences and faint trace of sulcus within, and 

 very narrow margin, shining, very faintly punctate: a dark green, 

 brown, or black sutural vitta and a lateral vitta widening below mid- 

 dle and occasionally uniting with sutural vitta below middle and 

 about apex, thus forming with the enclosed light yellow or whitish 

 areas a semblance to an exclamation mark on each elytron; margin 

 usually pale. Body beneath finely pubescent, abdomen yellowish 

 brown, meso and metasterna and anterior legs usually dark brown; 

 epipleura dark brown or black. 



Length. — 5 to 6 mm. ; width 2 to 3 mm. 



Type locality. — Texas. 



Distribution. — Texas, Louisiana. 



Jacoby described this among the Central American species of 

 Oedionychis as gracilis. Horn called gracilis merely a variety of 

 inter jectionis having the subsutural white vitta entire. 



There is also a form of this species with elytra entirel)^ green. 

 One specimen in the National Museimi is nearly green except for a 

 short, white vitta in basal half of either elytron. 



H. O. Marsh found the eggs and adult beetles on " tallow weed '' 

 {Euphorhia antisiphiliticai) at Brownsville, Tex. 



7. OEDIONYCHIS JACOBIANA Horn 



Oedionychis jacobianu Horn, Trans. Amer. Ent. Soc, vol. 16, 1889, p. 189. 



Oval, slightly oblong, surface shining, beneath entirely pale reddish 

 yellow, thorax yellowish, immaculate, elytra pale brown, with large 

 yellow spots. Antennae not reaching the middle of the body, piceous, 

 the three basal joints and half the fourth pale, the terminal also 

 yellow. Occiput piceous, front pale, frontal carina moderately 

 prominent, tubercles distinct, a well-marked impressed line between 

 the e^'Cs, a few coarse punctures on each side near the eyes. Thorax 

 more than twice as wide as long, narrowed in front, base scarcely 

 wider than middle, margin rather broad, reticulate when viewed 

 v\-ith transmitted light, anterior angles dentiform, surface almost 

 absolutely smooth, yellow, immaculate ; scutellum piceous. Elytra a 

 little wider at base than the thorax, humeri obtuse, umbone moder- 

 ately prominent, smooth, limited within by a rather deep impression, 

 lateral margin narrowly explanate, surface shining, sparsely rather 

 finely punctate near base, smooth at apex, color pale brown with 

 large yellow spots, the first basal of irregular outline, leaving the 

 umbone brown, behind this two smaller oval spots, followed by a 

 broad sinuous fascia interrupted by the suture, near the apex a spot 



