1899.] NATURAL SCIENCES OF PHILADELPHIA. 429 



medially; dorsulum convex; impressed; middle segment as in 

 2nmctatm but more strongly striated; petiole practically the same 

 as in punctatus, the pedicel of second segment a little longer and 

 more slender; outer nervure of third submargiual cell strongly 

 sinuous. Length 21 mm. 



Chapada, January and March. Two specimens. May be but 

 a variety of Z. punctatm notwithstanding the difference of sculp- 

 tui'e. 



Zethus emarginatus n. sp. 



Black; short line on scape beneath at base, crescent -shaped 

 mark at apex of clypeus, inner orbits near base of clypeus, dot 

 behind each antenna and on cheeks near top, one on tegulie ante- 

 riorly, line on postscutellum, two spots on middle segment near 

 insertion of petiole, line on each si<Ie of petiole on apical half, 

 dot at each side of base of pedicel of second segment, a short 

 line on its sides, and a narrow on the apical margin of segments 

 2-6, yellow ; tibise and the femora except hind pair, more or less 

 reddish; antenna beneath toward apex fulvous, joints 8-11 mar- 

 gined with pale yellow apically ; wings dark subhyaline, fuscous 

 along costal margin. 



r^. — Head deeply punctured, closest and smallest on vertex and 

 occiput, confluently so on front; cheeks except along the eye mar- 

 gin and near base of mandibles, smooth ; clypeus with separated 

 shallow punctures, covered with pale pubescence, fully twice as 

 broad as long, the fore margin armed with two widely separated 

 teeth; a T-shaped carina between antennse; the latter with the 

 flagellum robust, tolerably long, the first joint a little shorter than 

 the two following united, the apical joint obtusely pointed, if any- 

 thing, shorter than the two preceding joints united, joints 9 and 

 10 emarginate beneath at apex, especially the tenth; a raised line 

 runs back from the anterior ocellus; hind ocelli margined out- 

 wardly by a furrow or pit, the space between them if anything 

 slightly greater than that between them and eyes ; pronotum 

 cristate, not dentate or angulate, strongly punctured; dorsulum 

 strongly punctured, closest anteriorly, with an impressed line 

 medially in front, the usual posterior impressions indistinct; dor- 

 sulum similarly punctured, impressed; postscutellum entire; middle 

 segment sulcate medially, rugoso-striate, finely striate on sides, the 



