( 252 ) 



23. Gymnognathus comptus spec. nov. 



Close to G. clathratits (1894) Jord. The two vittae of head and rostrum 

 separate ; red space of head not so shar]ily limited, plicate ; basal angle of i)rothorax 

 more projectinj,' laterad, dorsal carina nearly straight in middle, pattern of pronotum 

 different ; a small transverse apical spot connected with large transverse basal spot 

 by a thin mesial vitta which widens a little behind middle, at each side of this vitta 

 at carina a strongly arched spot which does not reach middle ; this sj)ot connected 

 by an oblique stripe with a transverse subapical band, which extends upwards from 

 prosternum ; a line following the lateral bent of the carina; a lateral basal spot 

 continuous with the mesial spot ; red area more e.xtended than in clathratas, 

 reaching beyond middle. Elytra black-brown, alternate interspaces striped with 

 yellowish grey in basal half, these strijies gradually disajipearing, ])artly interruj)ted. 

 Pygidium brown-black, with very thin grey lines. Underside sparsely grey ; pro- 

 sternnm covered with a dense yellowish jmbescence like the spots of pronotum, 

 two brown transverse lines, one mesial, the other subbasal ; a yellowish lateral 

 vitta on meso-metasternum, interrupted in middle. Legs black. 



Length, 4i mm. 



Hab. llio Pardo, Sao Paulo, December 1898 (Gounelle). 



One specimen. 



24. Gymnognathus scolytinus spec. nov. 



? . Pygidium and anal sternite bidentate, the former with thin white mesial 

 vitta. Head rufous, upperside of rostrum and frons brown ; rostrum half as broad 

 again as long, very thinly pubescent grey like frons, dilated above antennal cavity, 

 with broad mesial carina, which does not reach ape.x. Frons more than half the 

 width of the rostrum, densely plicate ; occiput smooth. Antenna brown, short, 

 club rufous. Prothorax short, nearly twice as broad at base as long, brown, a]>ical 

 margin rufous, edged with white above, a spot before scutellum, preceded in front 

 of carina by a tripartite one, of which the mesial point is prolonged, an angle- 

 shaped dorso-lateral line before carina, accompanied laterally by a similar, thinner, 

 but longer angle-shaped (sometimes interruiited) line, which is concave laterally, 

 while the first is open discally, a line above lateral carina, and a transverse one 

 at side, all white ; dorsal carina rather close to base, concave in middle, slightly 

 convex laterally, lateral angle sharp, a little less than Oir, lateral carina extending 

 beyond middle, straight, basal angle of i)rothorax acute, basal longitudinal carina 

 forming an obtuse angle with the dorsal carina. Scutellum white. Elytra flattened 

 dorsally, but not at all impressed, slightly convex basally, evenly rounded-declivous 

 behind, rows of punctures distinct, pubescence ver}' fine; a large semicircular basal 

 sntural patch expanded between the fourth stripes and a humeral spot blackish, 

 posterior half and the whole sutural area also blackish, but covered with a 

 cinnamou-olive pubescence concealing the black colour, antemedian dorsal and 

 lateral area rufous ; no white markings. Pygidium brown-black, white mesial line 

 narrow. Underside brown-black, finely jiubescent grey, two lateral spots on 

 metasternum, and three less distinct ones on abdomen (segments 2 to 4) white. 

 Legs rufescent brown, apex of femora rufous, tarsi blackish. 



Length, 4i mm. 



Hab. Gallanga, Peru. 



3 ? ?. 



