1899.] XATUEAL SCIENCES OF PHILADELPHIA. 409 



Zethus striatifrons n. sp. 



Black; clypeus auteriorly aud at sides, mandibles medially, 

 greater part of scape, outer margin of tegulre and legs except 

 coxre, red; petiole with a narrow yellow line at apex, extending a 

 little along sides ; wings violaceous. 



9. — Clypeus nearly twice as broad as long, strongly augulate 

 laterally, striato-jDunctate, the fore margin subemarginate ; mandi- 

 bles short, broad, their width equalling half their length, with 

 coarse, elongate punctures; front striated, the vertex with sepa- 

 rated punctures ; space between hind ocelli distinctly less than 

 that between them and eyes; first joint of flagellum fully as long 

 as next two joints united, the length of scape about equalling 

 the pedicel and first four joints of flagellum ; pronotum margined 

 auteriorly, but not dentate, strongly punctured; dorsulum strongly 

 punctured, sparsely so posteriorly with a strong impression ante- 

 riorly in middle, and two rather parallel, less strong ones pos- 

 teriorly; scutellum rather flat, not or slightly impressed, post- 

 scutellum entire; middle segment Avith rather dense pale pubes- 

 cence, strongly impressed, or subconcave in middle, with trans- 

 verse, coarse striations extending a little on sides, but not evident 

 at base laterally, the extreme base in addition has some coarse 

 punctures and there is a sharp ridge (not extending to apex) 

 separating the sides from the rest of segment; swollen portion of 

 petiole ovate, about twice as long as broad, with large sparse punc- 

 tures, basal cylindrical portion about as long as hind coxje, trans- 

 versely ridged at base above; second segment with a short, thick 

 pedicel, dorsally with shallow punctures, sparse at base, and in 

 addition a fine, microscopic punctuation, ventrally with coarse 

 irregular punctures; remaining dorsals closely punctured, the 

 ventrals more strongly; second submarginal cell with a radial side 

 not equal to more than one-third of the distance between the 

 recurrent nervures on the cubital uervure; third submarginal 

 fully one-third broader above than beneath, the outer nervure 

 almost straight. Length 22-23 mm. 



d". — Clypeus longer, uot angulate laterally, with shallow punc- 

 tures, the fore margin with a strong tooth on each side; front finely 

 rugoso-grauulate, a slender raised line running down from the 

 anterior ocellus ; scape dilated apically; antennae terminating in a 

 hook, not coiled; impi*essious of dorsulum less distinct, the dorsu- 



