414 PROCEEDINGS OF THE ACADEMY OF [1899. 



nate obliquely in middle ; basal stem of petiole stout, about as long 

 as joints 2-4 of hind tarsi, the swollen portion elongate, cylindri- 

 cal, narrowed posteriorly, strongly punctured, its anterior and 

 upper surface forming a distinct angle at their junction ; pedicel of 

 second segment rather slender, its length not equalling the width of 

 apex of petiole, the dorsal and ventral moieties closely and finely 

 punctured, except along apical margins; second submarginal with 

 a distinct radial side which equals the distance between the first 

 transverso-cubital and first recurrent nervures on the cubital ner- 

 vure; third submarginal enlarged above, the outer nervure a little 

 sinuous. Length 12 mm. 



Santarem. One specimen. Resembles Z. cristatus, but the 

 clypeus is differently shaped, etc. 



Zethus cylindricus n. sp. 



Black; abdomen with sericeous pile; three spots on clypeus (one 

 at each side and anteriorly), line on mandibles, dot behind base 

 of each antenna, scape beneath, dot in eye emarginatlon and 

 at top of cheeks, line on pronotum anteriorly, dot at base and apex 

 of tegulse, line on postscutellum interrupted medially, two lines 

 on middle segment, and apical margin of all abdominal segments 

 (including sixth dorsal), yellow; wings subhyaline, slightly discol- 

 ored in costal cell. 



9. — Head with coarse, deep, close punctures, the cheeks less 

 punctured, but not shining; clypeus at base medially Avith a short 

 carina extending up between bases of antennse, barely one-third 

 broader than long, rounded at sides, truncate anteriorly; antennae 

 with flagellum strongly clavate, the first joint much shorter than 

 the two following united, the scape not quite as long as pedicel and 

 following four joints united; space between hind ocelli greater than 

 that between them and eyes; pronotum cristate anteriorly, sub- 

 dentate laterally, with coarse separated punctures; dorsulum with 

 confiueut punctures forming longitudinal ruga, wdth a raised line 

 anteriorly in the middle, and two longitudinal impressions posteri- 

 orly; scutellum punctured like dorsulum, scarcely impressed; post- 

 scutellum slightly prominent at sides, but not dentate; middle seg- 

 ment concave and sulcate medially, transversely rugose, the rugse 

 slightly running over the ridge which separates the sides from upper 

 surface, sides nearly smooth, apex furnished with two pale, lamella? 



