132 POMONA JOURNAL OF ENTOMOLOGY 



stigma rufo-testaceous. Male — Total length 9 mm. Jerome, Arizona. (Oslar.) 

 Base of thorax almost transverse, the edges bluntly rounded, the sides of 

 the apex rough, not very blunt, the center closely obliquely striated. Apex of 

 postscutellum broad, transverse, first abdominal segment large, cup-shaped, the 

 second clearly longer than it is wide at the apex, where it is strongly punc- 

 tured and reflexed, the base is slightly narrowed, the third, fourth and fifth 

 segments are closely punctured, the punctures deep and distinctly separated, 

 the apex of the sixth is less strongly punctured. Clypeus slightly longer than 

 wide, the apex depressed, almost transverse. Antennal hook black, reaching 

 to the middle of the tenth joint. 



Allied to O. sapelloensis, aequalis, and santaefcae from all of which it 

 may be known by the black mark on the first abdominal segment not being 

 incised laterally in the middle and by there being no yellow mark on the base 

 of the metanotum at the sides. 



Odynerus congressensis n. sp. 



Ferruginous, the following parts black : a broad oblique line above each 

 antenna, the vertex between the eyes, the fourth and following joints of the 

 antennae, the base and sides of the mesonotum broadly, the parts surrounding 

 the postscutellum. more or less of the center and apex of the metanotum, the 

 edges of mesopleurae, the mesosternum. The following parts are yellow : 

 the clypeus except for a curved rufous line around the center, a line on the 

 apex of the pronotum, a longish oval mark below the tegulae, postscutellum, 

 the apices of the first and second abdominal segments broadly, their sides to 

 near the base still more broadly, the others entirely, and the sides of the 

 metanotum broadly in the female, more narrowly in the male. Legs ferru- 

 ginous, the tibiae tinged with ferruginous in front. Wings hyaline, largely 

 tinged with violaceous in front ; the costa and stigma fulvous, the other nerv- 

 ures black. The pubescence is dense and pale. Female and male — Length 

 13 mm.. Congress and Prescott, Arizona. (Oslar.) 



Clypeus as long as wide, its apex broad, transverse ; it is strongly but not 

 closely punctured. Mandibles rufous, the teeth black. Apex of postscutellum 

 broadly rounded, rugosely punctured. Base of thorax transverse, the sides not 

 projecting ; the thorax is more than twice longer than wide. First abdominal 

 segment cup-shaped, smooth, the second if anything longer than wide, smooth 

 except at the apex which is strongly but not very closely punctured, and not 

 reflexed ; the third, fourth, and fifth similarly punctured, the last smooth, the 

 same parts of the ventral surface are more weakly punctured. 



The male is similarly colored except that the sides of the metanotum are 

 not broadly yellow, the front is yellow, not rufous, the clypeus is broad as in 

 the female, but the apex is not quite transverse. The antennal scape below, 

 the mandibles, the til)iae, and to a less extent, the tarsi, are yellow. Probably 

 the amount of yellow varies in both sexes. The puncturation is strong, and is 

 sparser on the center of the mesonotum. 



Allied apparently to O. ductus Cr. It is more slenderly built than arvensis 

 or annulatus, to l)f)th of which it is related. 



