CAMERON. DIPLOPTERYGA FROM THE SOUTHWEST 83 



one along the sides, and the postscutellum at the base, pale yellow. The upper 

 angles of the metanotum and broad bands on the apices of- the second and 

 following abdominal segments, pale orange yellow. The wings hyaline, the 

 costa, stigma, and nervures fulvous, the latter darker at the apex of the wings. 

 Abdomen smooth silky pruinose, the head sparsely covered with short black 

 pubescence, the thorax with short pale pubescence. Head, prothorax, and 

 mesothorax strongly closely punctured, the head less strongly than the thorax. 

 Clypeus slightly longer than its greatest width, the apex slightly roundly 

 incised, the sides broadly rotmded and lined with yellow. Base of thorax 

 transverse, the sides not angled. Postscutellum smooth, the apex transverse. 

 Upper half of the sides of metanotum with a distinct keel, the upper part of 

 the metanotum obscurely reticulated, the rest for the most part finely trans- 

 versely striated, the upper part of the metapleurae reticulated, the rest finely 

 closely longitudinally striated. Propleurae finely aciculated with scattered 

 punctures, shortly above the middle of the basal half is a wide furrow. The 

 ape.x of the second and following segments are closely strongly punctured. 

 The last ventral segment is entirely orange yellow, and the second and follow- 

 ing segments are broadly banded with that color. Female, length 12 mm. 

 Nogales, Arizona, (Oslar). 



Belongs to the group of O. nasidcns, l)ut the head and thorax are not 

 densely pilose. The wings too are hyaline. 



Odynerus pallidipictiis sp. nov. 



Black, densely covered with a white pruinosity which gives it a greyish 

 appearance. The top of the clypeus to shortly below the middle, two small 

 lines on the apex, a spot on the base of the mandibles, a longish line alcove 

 the antennae which is slightly gradually narrowed below and transverse at 

 the top and bottom, the inner side of the eye incision, a line on the top of the 

 outer side of the eye orbits a mark near the apex of mesonotum, postscutellum, 

 a broad line on the upper lateral half of metanotum. a large wide conical 

 mark below the tegulae, a band on the first abdominal segment, a large trans- 

 versely oval mark on the sides of the base of the second segment, a broad 

 irregular band on its apex and a narrow one on the third and fourth seg- 

 ments all around, pale yellow. Tegulae reddish, pale at the base and apex. 

 Under side of antennal scape yellow, the flagellum rufous below. Legs bright 

 red, the coxae black, the tibiae broadly yellow at the base. The apex of the 

 second abdominal seginent is more strongly punctured than the rest. Wings 

 hyaline. Female, length 8 mm. Hot Springs, Arizona, (Oslar). 



There is a specimen from Albuquerque, New Mexico, which agrees in 

 .structure and form with the above, but has no mark on the mesonotum. the 

 frontal mark is smaller, and the others larger. In coloration the species is 

 almost identical with O. vci^ascnsis Cam., but that species is easily separated 

 by the incised apex of the clypeus. In pallidipictus the head and thorax are 

 closely strongly punctured, the punctures sparser on the base of the meta- 

 pleurae, the apex of the clypeus is depressed in the center, the base of the 



