1899.] NATURAL SCIENCES OF PHILADELPHIA. 423 



nervure; third submarginal cell rhomboidal higher than long, not 

 widened above, the outer nervure nearly straight. Length 

 13 mm. 



cT. — Much more coarsely sculptured than ? ; clypeus anteriorly, 

 scape beneath, line on mandibles also yellow; clypeal teeth distinct ; 

 space between hind ocelli distinctly greater than that between them 

 and eyes; first joint of flagellum a little shorter than following two 

 united; the two terminal joints minute, the ultimate joint but 

 little if anything longer than the penultimate. Length 11 mm. 



Coruiuba, April; Uacarizal, February. Two specimens. This 

 species is very close to Z. rurjosiceps, but is smaller, the head less 

 ornate with yellow, the clypeus a little broader, the dorsulum with 

 an impressed line anteriorly, and the petiole is broader and more 

 coarsely punctured. 



Zethus diminutus n. sp. 



Black, with tolerably distinct hoary pile; dot behind each 

 antenna, in the emargination of eye, a small one on cheeks, pro- 

 notum anteriorly, dot at base and apex of tegulse, two spots on 

 scutellum and postscutellum, anterior tibiae in front, line at apex of 

 petiole bidentat3 or emarginate anteriorly, and a line on apical 

 margin of segments 2-5, emarginate anteriorly in middle, yellow; 

 second doi-sal somewhat brownish at each side near base, with 

 brownish pile; wings subhyaline, fuscous along costal margin. 



9. — Head with shallow, separated punctures; cheeks subcar- 

 inate down middle; clypeus similarly punctured, convex, barely 

 twice as broad as long, its fore margin with three widely separated 

 teeth, the medial one smallest; an indistinct T-shaped carina 

 between antenna; space between hind ocelli if anything slightly 

 greater than that between them and eyes; pronotum cristate, an- 

 gularly produced or subdentate at sides, rugoso-puuctate ; dorsulum 

 with large rather shallow punctures, anteriorly with a shallow 

 impression in middle, posteriorly with two indistinct ones; post- 

 scutellum carinated laterally, depressed medially ; middle segment 

 concave medially, the concavity bounded outwardly by a carina, 

 the space beyond this carina roughened and with some shallow 

 punctures (but it can scarcely be called rugose) ; sides near 

 lateral carina with distinct shallow punctures; petiole with basal 

 stem a little longer than hind coxa and trochanter, the enlarged 



