426 PROCEEDINGS OF THE ACADEMY OF [1899. 



ing a large Y-shaped carina; second segment Avith pedicel short and 

 stout, the dorsal surface finely and closely punctured, ventrally 

 with larger separated punctures, sparse toward base ; second sub- 

 marginal with no radial side, the first and second transverso-cubi- 

 tal veins uniting above. Length 9 mm. 



c?. — Very much like ? ; flagellura fulvous beneath and at tip, 

 the first joint about one-third longer than second, apical joint 

 truncate, stout, about twice as long as the penultimate, the elev- 

 enth joint broader, but still smaller than tenth ; pronotum sharply 

 dentate; sculpture a little coarser than in ?. Length 9 mm. 



Santarem. Two specimens. This species, and Z. thoracicus 

 are clearly allied in the shape of thorax and fine sculpture of head 

 and dorsulum, shape of clypeus, etc. The postscutellum and 

 middle segment are not strongly carinate in thoracicus, however. 



Zethus inconstans n. sp. 



Black; line on pronotum anteriorly, twice interrupted, spot at 

 apex of fiare femora, broad stripe on fore and medial tibiae, line at 

 apex of petiole, and a narrow line before apex of dorsal segments 

 2 and 3 ; wings subhyaline fuscous along anterior half of costal 

 and marginal cells. 



9. — Head with large punctures, the front having the appearance 

 of being reticulate; clypeus convex, silvery pubescent, with shallow 

 punctures, about one-third broader than long, the fore margin 

 polished, dentate at each side; flagellum strongly clavate, the first 

 joint considerably shorter than the two following united; space 

 between hind ocelli about equal to that between them and eyes; 

 pronotum cristate, sharply dentate at sides, rugoso-punctate; dor- 

 sulum with coarse punctures, anteriorly in middle with a raised 

 line, and medially with two somewhat parallel, longitudinal 

 carinse or folds,' the usual posterior impressions absent; postscutel- 

 lum carinate laterally and dentato-carinate medially; middle 

 segment depressed or subconcave medially with a sharp carina 

 beginning at the sides of postscutellum, the surface between this 

 carina and the very sharp lateral one, rugose, sides with some 

 coarse strise posteriorly; petiole with stem about as long as hind 

 coxa and trochanter, the enlarged portion elongate, narrow, barely 

 narrowed apically, with large sparse punctures; second segment 

 finely and compactly punctured above, beneath with large sepa- 



