460 PROCEEDINGS OF THE NATIONAL. MUSEUM vol. loi 



median longitudinal ridge, which is not continuous in its whole length. 



Color. — Bright toast-yellowish, darker on the dorsal face; head with 

 a minute and ill-defined black interocular spot; middle of the ventral 

 part of metathorax and abdomen black ; posterior femora with a dark 

 median ring on the middle ; posterior margin of pronotum and anterior 

 margin of elytra and scutellum with a narrow black margin ; pronotum 

 on each side of the central raised area with a basal brownish red oblong 

 spot and another of the same color but brighter on the top of the same; 

 central raised area somewhat darker than the rest of the pronotum; 

 posterior half of the longitudinal groove of the same toast yellow as 

 the elytra and scutellum. 



Measurements. — Length 3.6 mm.; breadth 2.4 mm. 



Tyye.—V.^.'^.M. No. 59906. 



Distribution oj material. — Rosario Lake, Rogagua, Bolivia, October 

 28 to November 9, 1922 (holotype male, W. M. Mann collector, 

 Mulford Biological Expedition, 1921-1922, in the U. S. National 

 Museum collection). 



Remarks. — This small species has few peculiarities. It may be 

 related to C. cribricollis, from which it can be separated by its smaller 

 size and the different punctation of the pronotum. It corresponds 

 to a group of very similar small species, mostly undescribed, which 

 seem to inhabit southern Brazil, Paraguay, eastern Bolivia, and 

 northern Argentina. 



CHLAMISUS CRIBRICOLLIS, new species 



Figure 89 



Of the same group as C. rogaguanus, recognizable by the chcular, 

 very uniform, and moderately dense punctures of its pronotum, wliich 

 tend to form regular rows in the median posterior part of the pronotum. 



Pronotum. — Seen from above its shape is triangular, broadly' rounded 

 at the apex; central raised area hemispherical, scarcely grooved longi- 

 tudinally in the middle; seen from the side the notal profile stoutly 

 conical, very little corroded on the top; the whole pronotal surface 

 covered with small circular punctures, all of a uniform size and 

 separated from each other by distances equal to their diameters; in 

 the middle of the pronotum, these punctures with a tendency to form 

 longitudinal rows, four or five of which are distinct. 



Scutellum. — Flat and smooth. 



Elytra. — Somewhat narrower than the abdomen, the sides of which 

 are partly visible posteriorly; basal margin finely toothed on its 

 internal half; the sutural margin toothed on the posterior two-thirds; 

 in the example at hand the suture not closing perfectly behind the 

 scutellum and a long and narrow triangular portion of the metanotum 

 visible between the elytra. Elytral hregularities feebly developed, 

 arranged as is common in this group of species and indicated in figure 



