284 E. T. CRESSON. 



Nysson quinquespinosus Say, West. Quar. Rep. ii, p. 7S. — "Body black: an- 

 tenn£e whitish beneath; olypeus white, with a U)iigitudinal bhiok line; mandi- 

 bles black; margin of collar, tuberculi, (Kirby), an oblique interrupted lino above 

 the wings, scutellar line and tips of the metathoracic spines, whitish : spines 

 about five, the superior ones largest, the intermediate one of the inferior series 

 obtuse, sometimes obsolete; tibia, anterior pairs white before; anterior tarsi 

 with elongated setae before, (as in many species of Gorytes) ; abdomen with 

 the posterior margins of the segments glaucous, above somewhat iridescent. 

 Length less than two-fifths of an inch. 



" Inhabits Arkansa." 



Not seen. This probably does not belong to the genus Nysson. 



HYPONYSSON Cresson. 



HypoiiySiSOn bicolor n. sp.— 9. — Small, black, opaque, densely and 

 finely punctured, sides of face and clypeus clothed with silvery pubescence; 

 mandibles ferruginous; space between ocelli not raised; mesothorax with a 

 well impressed central longitudinal line; prothorax rather coarsely punctured; 

 mesopleura rugose; postscutellum not raised; metathorax coarsely reticulated, 

 the basal middle with longitudinal rugse, the lateral spine short and acute; 

 tubercles white; wings subhyaline, apex and marginal cell smoky; marginal 

 cell long and pointed at tip, the first submarginal as long as the marginal, the 

 second submarginal small, triangular, petiolated, receiving both recurrent nerv- 

 ures, one near base and the other near apex, the petiole nearly as long as the 

 cell is high ; in posterior wings the anal and discoidal cells are separated by 

 a prolonged longitudinal nervure; abdomen shining, finely and rather closely 

 punctured, entirely rufp-ferruginous. Length .25 inch. 



Hah. — Washington Territory, (Morrison). One specimen. This seems 

 to differ from Nysson only by the absence of the third submarginal cell. 



