208 p. CAMERON. 



-^Odynerus ( Ancistrocerns) arizoiiaeiisis sp. nov. 



Black, densely covered with white pubescence, which gives it a grayish appear- 

 ance; the underside of the antennal scape, two large oblique marks, twice longer 

 than wide, on the top of the clypeus, a small mark twice longer than wide over 

 the antennte, a longish triangular mark on the base of the mandibles, a small 

 mark behind the top of the eyes, two irregular marks on the apex of the prono- 

 tum, a round mark on the apex of the mesonotum in the centre, a smaller one 

 on the sides, postscutellum, a large broad line on the sides of the metanotum. a 

 largish mark on the pleurae below the tegulse: a large, oblique mark on the sides 

 of the first abdominal segment, a large, irregular, longer than broad, counting 

 transversely, mark on the sides of the second segment, broad lines, that on the 

 first narrowed on the sides, on the first and second and narrow ones on the other 

 segments, yellow. The apices of the four anterior femora narrowly, the base of 

 the anterior tibiae narrowly, its apex still more narrowly, and the four posterior 

 tibife behind to near the apex, pale yellow. Wings hyaline, the apex of the cos- 

 tal and the greater part of the radial cellules smoky. 9 • Length to end of 

 second segment 8 mm. 



The punctuation is strong and close; on the clypeus the punctures are sparser, 

 and especially above weaker. Clypeus as wide as long; its apex depressed, 

 slightly roundly incised, the thickened sides forming almost teeth. Thorax 

 longish, narrowed towards the apex. The postscutellum forms a raised trans- 

 verse ridge at the base; its apex is broadly rounded. Sides of metanotum 

 broadly rounded. First abdominal segment longish cup-shaped ; its apex is only 

 very slightly raised ; the second is not much longer than wide, hardly narrowed 

 at the base; its apex depressed, strongly reflexed ; the basal crest is not promi- 

 nent. Tegulse yellow, black in the middle. 



Oslar : Congress, Arizona. 



Has the coloration of colon, but with the yellow paler ; it is 

 smaller, has the postscutellum more distinctly raised at the base and 

 narrower, has the pubescence denser and paler ; the apex of the 

 clypeus is not transverse, and the second abdominal segment is 

 strongly reflexed^ 



^ Ancistroceriis pelia*^ sp. nov. 

 Black; the base and underside of anteunal scape, the clypeus. mandibles, a 

 line, not much narrowed below, three times longer than wide, above the antennae 

 on the front, the eye incision, the upper part shorter and wider than the lower, 

 a broad line, narrowed below, on the upper half of the outer orbits, the prono- 

 tum to beyond the middle, tegulae, a spot behind, a mark, somewhat oval in 

 shape, on the apex of the mesonotum, a small spot on the sides of the scutellum 

 in the middle, postscutellum, the sides of the metanotum broadly, the mark ex- 

 tending on to the pleurae, a large squarish mark on the mesopleurae above, a 

 longer, narrower, more oblique one immediately below it, a line on the apex of 

 the first abdominal segment, narrowed laterally and having attached to its sides 

 a large oblique mark, somewhat more than one-third of the width of the seg- 

 ment, and extending along the edge of the top of the apical slope, a broad trans- 

 verse line across the middle, reaching close to the middle and becoming narrowed 

 on the innerside and united to a broad apical border laterally; the apices of the 



