330 AMERICAN HYMENOPTERA. 



at base and apex, the sides of pronotum rounded, of the metanotum ending in a 

 not very sharp point, above the middle. There is a broad smooth flat line down 

 the middle of metanotum ; the sides are obliquely striated. The 1st abdominal 

 segment large, cup-shaped, with a distinct neck at the base and a narrow furrow 

 down the middle of apical half; the apex is sparsely punctured. 2nd abdominal 

 segment square, closely, distinctly punctured, most strongly at the apex, which 

 is slightly incurved ; the other segments closely, strongly punctured. Base of 

 ventral segments black. Antenna! scape rufous. Mandibles rufo-fulvous, black 

 at the apex. 



New Mexico. Allied to 0. santcefecB Cam. ; in that species the 

 marks on the thorax are yellow, not red ; there is a separate mark 

 on the sides of the metanotum at the base, the apical mark on the 

 1st abdominal segment has a distinct broad basal pedicle by means 

 of which it is attached to the basal ; the mark on the 2nd is much 

 wider at the apex, and it is there, on the sides, obliquely narrowed ; 

 while in the present species it is rounded and of equal width at the 

 base and apex. 



Odynerns santse-reee sp. nov. 



Black, densely covered with fuscous pubescence; a transverse mark, twice 

 wider than long and with rounded sides, over the antennse, the clypeus, except 

 the sides and apex, and a large mark, longer than wide, transverse below, more 

 rounded above, in the centre; a narrow short line on the base of the mandibles, 

 a short line on the top of the outer orbits, a line, narrowed in the middle, the 

 sides of almost equal width, on tbebase of the thorax, a conical mark, its top 

 obliquely truncated, below the tegulse, tegulse, except for a fuscous mark at tlie 

 base, the basal half of post-scutellum, a large oval, transverse mark on the top 

 of metanotum at the sides, a broad, irregular line down the apical two-thirds of 

 its sides, and the apices of the abdominal segments broadly, sulphur yellow; the 

 abdomen has the following parts black: the basal slope of the 1st segment, its 

 middle third prolonged beyond the top, and having, at its apex, a transverse 

 mark, with the sides gradually narrowed to a bluntly-rounded point, which does 

 not reach to the sides of the segment ; slightly more than the basal two-thirds 

 of the 2nd segment, the basal third extending to the outer edges, the middle with 

 an irregular incision in the centre, the incision gradually narrowed to a point on 

 the innerside and longer than it is wide at the apex ; the part bounding its apex 

 is narrow; shortly before the apex of the latter the mark becomes obliquely 

 narrowed; the apex itself is transverse; the penultimate segment is broadly 

 black at the base, the mark obliquely roundly narrowed laterally, and with a 

 squarish projecting on either side of the middle, the last segment is black round 

 the edges; the 1st ventral segment black ; the 2nd with the base black to shortly 

 beyond the middle, the sides with a curved projection, and the middle with a 

 broader, shorter one, and with an irregular ajiex ; the sides of the following three 

 with broad black lines at the base, roundly dilated on either side of the middle ; 

 the last has the apex broadly black. Wings hyaline, iufuscated along the fore 

 margin, the costa and stigma fulvous, the nervures black. Legs yellow, tinged 

 with fulvous, the tarsi more rufous in tint, their base black to beyond the middle 



