406 AMERICAN HYMENOPTERA. 



across the vertex from eye to eye and encircling the ocelli, this black arc extends 

 backwards forming a border along the superior posterior portion of the head, 

 flagel almost completely pale brown, its tip, which is somewhat recurved and 

 apparently spatulate, dark brown. 



Thorax. — Metathorax distinctly biconvex, shining and punctured in mucli the 

 same way as the dorsulum, the excavation of the metathorax represented by a 

 smooth line at the base of the groove between the two concavities, no lateral 

 sharp ridges, the metathorax being rounded off laterally and devoid of processes 

 at its junction with the abdomen ; dorsulum with a broad median brown line ex- 

 tending from its anterior margin nearly to its posterior margin ; on each side of 

 the dorsulum there is a black mark extending from the junction of the anteiior 

 with the middle third, but not from the margin of the pronotum, back to the 

 posterior margin of the dorsulum where it joins the black line along the suture 

 between the dorsulum and scutel, the latter mostly yellow, with a longitudinal, 

 bisecting, impressed line, most of the sutures of thorax brown or brownish; 

 wings transparent, with a fuscous tinge ; the apical cells and those along tne an- 

 terior margin of the front wings clouded with fuscous; legs almost completely 

 yellow. 



Abdomen.— Yhsi segment nearly as long as wide at apex, smooth and finely, 

 rather closely punctured ; second segment a little wider at apex than long, punc- 

 tured about like the preceding segment, succeeding segments more and more 

 finely punctured, apical segment impunctate or practically without punctures; 

 first segment with a brown mark basallyon its dorsum and apically on its venter, 

 second segment brown at its extreme base, with a greenish transverse line be- 

 tween the apical and middle thirds, the succeeding dorsal segments, except the 

 ultimate and penultimate partly greenish, mostly yellow, penultimate segment 

 black at base, mostly yellow beyond and partly greenish, apical segment black, 

 with a brownish margin posteriorly, ventral segments yellow, with the following 

 exceptions: third, fourth and fifth with a brown spot on each side at base, sixth 

 black to brown at base, greenish along its apical margin, seventh blackish, with 

 a trilobate yellow mark. 



Type. — University of Kansas. 



Type locality. — Bill William's Fork, Arizona. 



Collected in August by F. H. Snow. 



Odynerus pulveruleiiia u. sp. 



Related to san88ure%,fxom which it differs chiefly in the punctured 

 first and second abdominal segments, and in the dull yellow livery. 

 Bhick, with yellow to brownish- yellow markings. 



9 ■ — 10 mm. — Head. — Shining, closely punctured, except on the cheeks and 

 vertex, where the punctures are more separated than on the front, an irregular 

 depression on the vertex on a line with the median ocellus, clypeus smooth and 

 shining, somewhat striate with the striae terminating in the sparse punctures; 

 pubescent in such a way as to have the appearance of being dusted with a subtle 

 yellowish powder; two spots on the anterior margin of the clypeus aie yellow as 

 are the following parts: a cuneate mark on each side of the posterior margin of 

 the clypeus, an emarginate mark between the antennae at their insertion, lateral 



