AMERICAN HYMENOPTERA. 315 



first recurrent nervure is received distinctly in the 2nd cubital 

 cellule, and it differs further from Alyson in the abdominal 2nd seg- 

 ment being broadly banded with yellow instead of having two yel- 

 low marks at the base. 



%. — Second cubital cellule petiolate; the 1st recurrent nervure is received 

 shortly beyund the first transverse cubital ; the 2nd is interstitial ; the transverse 

 median nervure is interstitial. Antennae stout; the apical joint roundly incised 

 on the basal half beneath. Mandibles longish, slightly narrowed behind the 

 middle. Eyes large, slightly diverging above and reaching to the base of the 

 mandibles below. Ocelli large, placed almost in a triangle. Pronotum wider 

 than long. Median segment large ; in the centre, at the base, is a large triangu- 

 lar area, which reaches near to the top of the apical slope and is joined to it by a 

 short keel ; the apical slope is keeled above and down the centre. Legs long, 

 slender; the middle tibise have one spur ; the apex of the hinder femora bears a 

 short tooth below. Abdomen not much longer than the head and thorax united ; 

 the apical segment without a distinct pygidial area, strongly punctured, the sides 

 bordered, the apex transverse, with the sides slightly projecting; its ventral sur- 

 face is flat, simple. The antennae are placed shortly above the clypeus ; the cly- 

 peus is short, transverse in the middle at the apex, the sides broadly rounded. 

 The base of the pronotum is clearly separated behind by a transverse furrow ; 

 there is a transverse furrow on the base of the mesonotum ; the basal segment of 

 the abdomen is marked with yellow ; the base of the second is broadly banded 

 with yellow ; the pterostigma is large, the radius is roundly curved from the base 

 to the apex. 



Oxsea tachytiformis sp. nov. 



Black, the head and thorax thickly covered with pale fulvous pubescence ; the 

 apices of the abdominal segments banded with pale pubescence ; the wings fusco- 

 violaceous, paler at the base ; the eyes at the top are separated by the length of 

 the scape of the antennae — by a distinctly greater distance than the length of the 

 12th antennal joint. %. Long: 19 mm. 



Antennae black, bare, the last joint obliquely truncated. Head opaque, closely 

 punctured, except on the apex of the clypeus; the occiput, the vertex, sides of 

 the face, clypeus and labrum thickly covered with pale fulvous hair; there is a 

 long broad depression in the centre of the clypeus; below the front ocellus is a 

 fovea, which is widened at the base and roundly narrowed at the apex. The 

 eyes are large, reach to the base of the mandibles and distinctly converge above 

 where they are separated by fully the length of the scape; the inner orbits are 

 obliquely depressed. Labrum shining, its top finely and closely transversely 

 striated ; the sides are obscurely punctured and thickly covered with pale ful- 

 vous hair; the apical half is keeled in the middle. Mandibles piceous-black ; be- 

 low fringed with long pale fulvous hair. Thorax closely, uniformly and distinctly 

 punctured. The dorsal segments of the abdomen are closely punctured, more 

 strongly on the basal two, the others being more shining and smooth on tlie 

 base ; the hair bands on the apices of the basal four segments are broad and white • 

 on the 5th the hair band is longer and darker colored at the base ; the apical two 

 segments are testaceous towards the apex, the last has a broad, shallow, rounded 

 incision on the apex. Wings fuscous-hyaline, with a distinct violaceous tinge! 



TKANS. AM. ENT. SOC, XXVII. NOV., 1901. 



