VITTATE CHRYSOMELID BEETLES DISONYCHA — BLAKE 73 



faintly alutaceous and finely punctate, pale yellow with a narrow dark 

 sutural vitta and a median vitta having within it a pale line not reach- 

 ing base or apex, along the side a pale, washed out vitta, this being 

 somewhat costate; epipleura pale. Body beneath covered with fine, 

 pale pubescence, pale with the middle of the breast and abdomen 

 darkened usually, also a spot on either side of the prosternum, legs 

 often entirely pale. Length 6 to 6.7 mm.; width 2.8 to 3.2 mm. 



Type: Not designated; described from several specimens from 

 Salinas Chicas, Fuerte, and Rio Colorado, Argentina, collected by 

 Adolf Doring and P. Lorentz. 



Other localities: Argentina: Buenos Aires, G. L. Harrington, 

 Chaco santo-fesino, W. H. Schladitz, August, September, October, 

 1911. Uruguay: Montevideo. Brazil: Santa Catarina. 



Remarks: One specimen from Chaco, and one from Santa Catarina 

 are a little larger and paler than the others, with the ventral surface 

 entirely pale. The splitting of the median elytral vitta is peculiar 

 to this species although one other species is known to have this char- 

 acteristic to a lesser degree. 



Disonycha scissovittata, new species 



Figure 47 



About 5 mm. in length, oblong oval, feebly shining, alutaceous and 

 finely punctate; pale yellow; antennae except the basal joints dark; 

 a faint reddish brown spotting in the middle of the pronotum; elytra 

 with a narrow dark sutural vitta and a submarginal vitta, neither 

 reaching the apex, and a wider median vitta with a pale center line 

 (in one specimen the entire length, in the others the pale interline 

 only towards the apex) ; body beneath and legs pale. 



Head with interocular space approximately half the width of the 

 head, entirely pale except for reddish brown mouthparts, smooth 

 except for fovea near eye, the tubercles distinctly marked, carina 

 moderately broad, lower front long and narrow. Antennae short and 

 stout, the three basal joints pale. Prothorax twice as wide as long, 

 with curved sides, moderately convex, with little trace of basal depres- 

 sion, alutaceous and very finely punctate, pale yellow with a deeper 

 reddish brown spotting in middle, consisting of two spots anteriorly 

 and a long median mark, these all confluent. Scutellum pale. Elytra 

 smoothly ovate, faintly shining, alutaceous and finely and moderately 

 densely punctate, the sutural vitta narrow, not reaching the apex, 

 the sutural edges pale, the median dark vitta in two specimens divided 

 in apical part, the third specimen having a nearly entire pale vitta 

 within the dark one, the submarginal vitta deep reddish brown, not 

 reaching the apex. Epipleura pale. Body beneath and legs entirely 

 pale. Length 5.3 to 5.4 mm.; width 2.9 mm. 



