AMERICAN HYMENOPTERA. 107 



from above straight, not emarginate; a small distinct tubercle the 

 antenna;; frontal impressed line faint. Ocelli in a low triangle, the 

 distance between the lateral ocelli about the same as the distance 

 between one of them and the nearest eye margin. Antennas serrate 

 beneath from joints 9 to 12; apical joint almost as long as joints 11 

 and 12. Dorsulum closely punctured at the sides and anteriorly, 

 posteriorly shining, impunctate; lateral furrows distinct; mesopleurae 

 granular. Scutellum shining, with a few punctures, slightly impressed 

 in the middle, surrounding sutures distinct. Metanotum renticulate, 

 without a ridge or channel; metapleuras and the posterior face similarly 

 sculptured, but appearing granular at certain angles; posterior face 

 without lateral ridges or middle fovea. Legs rather slender, middle 

 tibiae almost without spines. Venation normal taking argentine as 

 the normal type. Abdomen shining, almost impunctate, somewhat 

 constricted between the first two segments. Color black; mandibles 

 except the piceous apices, and the four anterior legs below the knees 

 yellow; tegulae and tubercles pallid. Face below the antennas with 

 silvery pile. Wings hyaline, somewhat iridescent; venation pale 

 brownish, stigma darker. 



Habitat. — Rowe, New Mexico (W. P. Cockerel!) . 



A very distinct species, perhaps closets to leguminiferus 

 Ckll. and Fox, but different in the color of the legs, serrate 

 antennae, tubercle between the antenna?, and other characters. 

 Differs from occidentalis Fox in the sculpture of the front, etc. 



Diodontus florissantensis n. sp. 



Female. — Length 3.5 mm. Labrum slightly notched, but not ex- 

 certed, and hard to see. Clypeus with two strong teeth at the sides. 

 Head shining, with a few scattered punctures; frontal line very dis- 

 tinct. Ocelli in a little less than an equilateral triangle, the distance 

 between the lateral one about the same as the distance from one of 

 them and the nearest eye margin. Antennas normal, the third joint 

 hardly any longer than the fourth. Pronotum not carinated. Dor- 

 sulum and scutellum shining, sculptured like the head; lateral furrows 

 of the dorsulum distinct, the suture between them strong. Meso- 

 pleuras coarsely granular, striato-granular beneath. Metanotum ru- 

 gose, not channeled or with a carina; metapleuras striato-granular; 

 posterior face not ridged laterally, with the middle fovea rather weak, 

 granular. Legs normal; venation normal. Abdomen shining, im- 

 punctate, not constricted between the segments; the pygidium tri- 

 angular, with a few strong punctures. Color black; mandibles except 

 the piceous apices, and the tubercles yellowish; legs below the knees 

 orange-red, the tarsi infuscated. Wings clear hyaline, iridescent; 

 venation black. Besides the usual pubescence the insect is nude. 



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



