Fossorial ITymenoptera of North America. 387 



Stigmus fraternus, Say. 



Stigmusfrati rnus, Say, Long's Second Exp. App. p. 340. (1824). 



Cemonus fraternus, Smith, Cat. Hym. Br. Mus. iv. p. 434. (1856). 



Mimesa fraternus, Smith, Cat. Hym. Br. Mus, iv. p. 430. (1856). 

 % . Head very transverse, retreating rapidly behind; above highly 

 polished ; impressed line in front of ocelli very distinct; silvery below 

 on orbits and clypeal region ; front converging rapidly towards inser- 

 tion of mandibles, which are white, fuscous at tip ; clypeus sub-acutely 

 produced in front. Antenna; throughout pale testaceous; scape thick- 

 ened, short. Thorax smooth, mesial, sub-mesial and parapsidal grooves 

 well marked; meso-scutellum polished like the scutum; meta-scutel- 

 luru very minutely rugose. Propodeum above with a basal, concave, 

 elliptical area, surrounded by ridges, divided longitudinally by the 

 faintly impressed mesial line, with transverse rugae interrupted by the 

 mesial line; with shallow fossae on the sides; posteriorly a net-work of 

 smaller fossae ; tegulas pale testaceous, as is the base of the wing, tu- 

 bercle white, nearly contiguous to the prothorax ; nervures testaceous 

 on the middle of the ring, blackish on the costa ; ptero-stigma black or 

 testaceous. Legs pale fuscous throughout. Pedicel as long as the 

 abdomen is broad, grooved above with sharp ridges on the sides, 

 black, tip fuscous. 

 Length, .18 inch. 



9 . Differs in its more cubical head; eyes scarcely converging towards 

 the front, mandibles larger, antennae brown on the outer half above, 

 with dilatations extending down on the sides of the joints, anterior 

 legs pale testaceous, femora shaded darker ; middle and hind femora 

 black, especially posterior pair, which are not tipped with testaceous 

 or honey-yellow, and the hind tibiae are dark posteriorly. Abdomen 

 shorter and broader than the % ; tip very acute, mucronate. 



Length, .20 inch. 



"Lives in the stem of Syringa," Angus, West Farms, N. Y. 



DESIDERATA. 



Stigmus parallelus, Say. 



S. parallelus, Say, Bost. Jour. Nat. Hist., i, p. 378. 



"Mexico," (Say.) 



Stigmus pusillus, Say. 



S. pusillus, Say, Bost. Jour. Nat. Hist., i, p. 378. 



"Indiana," (Say.) 



