AMERICAN HYMENOPTERA. 445 



part obliquely narrowed, the centre dilated semi-circularly towards the 

 base, the apex of the penultimate segment and the greater part of the 

 hypopygium, black ; wing blackish fuscous, the stigma pale ochra- 

 ceous yellow, its apex black ; the third abscissa of radius twice the 

 length of the second. 9 . Length 10 mm., terebra 7 mm. 



Head and metathorax densely covered with white pubescence. Face 

 alutaceous, opaque. Temples a little longer than the eyes, obliquely 

 narrowed. The abdomen has only the suturiform articulation ; it is 

 smooth and has a shallow, curved apical lateral branch which extends 

 beyond the middle of the segment ; the area on the second segment 

 extends to the apical fourth of the segment. 



Mendoza, May. 



30. Iphiaulax Holmbergii sp. n. 



Bright-red (the color of red sealing wax), the antennae, base of 

 mandibles, palpi, face, except the sides and lower edge narrowly, front 

 except on the lower outer edge at the antennse slightly, and the orbits 

 narrowly, the black on the front prolonged broadly on to the half of the 

 vertex on the sides, more narrowly behind the ocelli, this part having 

 small triangular dilatation, a mark on the sides of the occiput below, 

 two broad lines close together on the central basal half of the meso- 

 notum, a wider one on each side on the apical three-fourths, the meta- 

 notum, except for a mark in the centre, its base abruptly narrowed 

 into a cone, the breasts, the central lower half of the propleurae, this 

 black part longer than the basal or apical, the lower part of the meso- 

 pleurse, the black at the apex narrowed and commencing near the top, 

 the rest commencing shortly above the centre, the apical upper part 

 obliquely narrowed and rounded at its junction with the other ; below 

 the basal half is separated from the black breast by a red line. Meta- 

 pleuras black, except under the wings. Wings fuscous, the base 

 hyaline to near the transverse basal nervure, the first cubital cellule 

 hyaline except at the base below, and the usual hyaline spot in the 

 discoidal cellule ; the stigma light ochraceous ; the third abscissa twice 

 as long as the basal two united. Abdomen smooth and shining, the 

 plate on second segment narrowed to a point and extending to the 

 apical fourth of the segment ; it is bounded by deep smooth furrows, 

 which unite with a lateral one, the two forming a large tringular area; 

 the four furrows at the base are separated by a squarish tubercle at 

 the base of the segment ; on the base of the fourth and fifth segments 

 are obliquely curved smooth furrows. The four anterior tarsi and the 

 apex of the tibiae are dark rufous. o". Length 8 mm. 



Mendoza, March. 



31. Iphiaulax adornatus sp. n. 



Red, the antennae, head except for a transverse mark of equal width, 

 twice wider than long, in the centre of the vertex behind, the base and 



TRANS. AM. ENT. SOC, XXXV. DECEMBER, 1909. 



