390 AMERICAN HYMENOPTERA. 



raetathorax shining and transversely striate, presenting a concave surface 

 bisected by a narrow shining smooth space part vray down the middle and partly 

 by a somewhat incomplete longitudinal channel, its lateral margins terminating 

 in the middle in a rather acute angled tooth, a yellow mark on each side of its 

 dorsal aspect. 



Abdomen. — With its pubescence and color much the same as on tne thorax, 

 rather closely punctured, the punctures closer and coarser near the edges of the 

 2nd-5th segments than elsewhere; first dorsal segment nearly as wide as, but 

 only about half as long as the second, with a faint median longitudinal impres- 

 sion, otherwise uniformly smooth, a broad yellow border along the posterior 

 margin, continued laterally anteriorly and then toward the middle line, the pos- 

 terior border with a brown line on each side; the second dorsal segment with the 

 apical margin reflexed in much the same way as in rectangulis, its ornamentation 

 almost the same in scheme and color as that on the first; the exposed portions of 

 the remaining dorsal segments, the second, third, fourth and fifth ventral seg- 

 ments with an apical sinuate border, and the base of the apical ventral segment 

 yellow. 



%. — 10 mm. — Very like the 9i from which it differs in having the clypeus 

 entirely yellow, in the abscence of yellow maiks on the metathorax, in having 

 yellow marks on the anterior coxge, in the absence of accessory yellow lines to 

 the border of the second dorsal abdominal segment, in the apical ventral segment 

 of the abdomen which is not yellow at base, and in the tibiae and tarsi which are 

 more brownish than yellow. 



Type. — University of Kansas. 



Type locality. — Thomas' Ranch, Oak Creek Canon, 6000 ft., 20 

 miles southwest of Flagstaff, Coconino Co., Arizona. 



Paratopotypes 9 , 1 or 2 mm., smaller than the type % , with 

 practically all the anterior half and part of the posterior half of 

 the clypeus black and with the second dorsal abdominal segment 

 ornamented in the same way as the type % ; % metathorax with 

 yellow marks. 



All collected by F. H. Snow. 



Odynerus spectabiliformis n. sp. 



Very like sjiectabilis in structure. The following description is 

 comparative with reference to Saussure's description in his "Ameri- 

 can Wasps." 



9 • — 12 mm.— Head. — Clypeus broader than long and pitted with deep distinct 

 well-separated punctures; vertex with a depression back of the middle ocellus; 

 pubescence silvery and golden, but so inconspicuous as to escape superficial obser- 

 vation ; black, with the following yellow parts: clypeus, scape anteriorly, a mark 

 between insertion of autennpe, and somewhat above the same another mark 

 between the antennaL sockets and the eye margin, and a line on the cheeks and 

 vertex along the posterior eye margin ; scape and greater part of flagel behind 

 brown. 



