1^99.] NATURAL SCIENCES OF PHILADELPHIA. 417 



striate- or rugoso-punctate ; clypeus forming a nearly exact hexa- 

 gon, coarsely striato-punctate, the fore margin rather broadly and 

 evenly truncate; space between hind ocelli about equal to two- 

 thirds of that between them and eyes; pronotum cristate, obtuse at 

 sides, irregularly rugoso-punctate; dorsulum with rather shallow, 

 separated punctures, with a feeble impressed line anteriorly in the 

 middle, and four impressed lines posteriorly, the two inner ones 

 strong and deep, the outer ones shallow, and indistinct; scutellum 

 more closely punctured, impressed; postscutellum subemarginate, 

 that is to say the lateral angles are quite prominent, subdentate; 

 middle segment not broadly concave, broadly furrowed, rather 

 densely pubescent with pale hairs, the convexities rugose but not 

 coarsely, carina between sides and upper surface indistinct except 

 toward base, sides finely punctured; stem of petiole rather long, 

 slender, longer than hind coxse and trochanters, the enlarged 

 portion of segment a little more than twice as long as broad, 

 rounded at base, with large punctures, the sides rounded out; 

 second segment above finely and closely punctured at base, the 

 punctures becoming larger and shallow toward apex, the ventral 

 surface with tolerably large punctures, sparsest medially, and 

 entirel}^ wanting at base, which is smooth and shining, pedicel very 

 short and stout at least one-third l)roader than long; radial side 

 of second submarginal cell barely equalling half the distance 

 between the first transverso-cubital and first recurrent nervures on 

 the cubital nervure; third submarginal cell widened almost one- 

 third above, the outer nervure nearly straight. Length 14-15 mm. 

 Chapada, March and Octolier. Three specimens. The petiole, 

 compared with Z. fraternus, has a long stem, the enlarged portion 

 short and broad. 



Zethus bicolor n. sp. 



Head, antenuffi, dorsulum, scutellum anteriorly, mesosternum, 

 and body of alidomen, black; otherwise the body red; two dots on 

 front, pronotum anteriorly sometimes, spots on tegulse rarely, two 

 dots on postscutellum and line at apex of petiole, yellow; wings 

 fuseo-violaceous. 



9. — Head with strong separated punctures, the front striato- 

 punctate; clypeus hexagonal, broader than long, striato-punctate, 

 the fore margin truncate, with a slight tooth on each side; space 



